Lectures notes for 2010 - KTH

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Personal monitoring Darwin Valderas Núñez recent MS thesis “Integration of sensor nodes with IMS” showed the ability for a coach to monitor a runner remotely via IMS [23]. However, the delays of IMS are so high as to make this approach impractical, but he could have simply used SIP + RTP (or SRTP) to stream the sensor data to the coach’s PC and had very low delay. Maguire Personal monitoring 13: 52 of 91 maguire@kth.se 2010.03.21 Internetworking/Internetteknik
Vehicle Area Networks (VANs) Controller Area Network (CAN) bus within vehicle to interconnect sensors, actuators, and controllers ⇒ improved performance with a decrease in vehicle weight. Truck to trailer communication - extending the vehicular network to the trailer (or trailers) [24] In vehicle entertainment - audio/video/gaming/… for passenger and audio for the driver. Hands free voice telephony - as handheld cellular is banned in most countries • Does the driver plug in their iPOD/phone/… and use the facilities of the vehicle? • Does the vehicle incorporate the driver/passengers by extending/adapting itself for them? • Does the vehicle adapt the output audio/video/… to the vehicles context (for example, the phone will not permit calls at high speed when there are lots of other cars within minimum breaking distance)? Maguire Vehicle Area Networks (VANs) 13: 53 of 91 maguire@kth.se 2010.03.21 Internetworking/Internetteknik
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IK1550 Internetworking/Internettekn
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Internetworking....................
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Virtual Interface (VIF)............
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Module 2: IP Basics: Routing, ARP,
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Wireshark’s IO Graph functionalit
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ICMP Redirect .....................
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Building a UDP packet from scratch
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Module 5: TCP, HTTP, RPC, NFS, X...
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Problems with multiple connections.
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Module 6: SCTP ....................
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Module 7: Dynamic Routing .........
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BGP Open Message ..................
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IGMP Implementation Details........
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Capacity Assignment ...............
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Network Management Systems ........
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Module 10: IPv6 ...................
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Why IPv6? .........................
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Wireless WANs . . . . . . . . . . .
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Module 12: IPSec, VPNs, Firewalls,
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Module 13: Future and Summary......
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Peer to peer networking ...........
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Module 14: Some exercises..........
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Welcome to the Internetworking cour
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Goals, Scope and Method Goals of th
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Learning Outcomes Following this co
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Prerequisites • Datorkommunikatio
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Topics • What an internet is and
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Grades: A..F (ECTS grades) • To g
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Written Assignment Goal: to gain an
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Literature The course will mainly b
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Lecture Plan Subject to revision!
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Context of the module Communication
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How can we deal with all of these d
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Basic concepts open-architecture ne
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Internetworked Architecture H … M
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Trends: Shifting from traditional t
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IP traffic growing exponentially! T
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Growth rates Some people think the
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Increasing Data Rates “Ethernet
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The Internet Today Local … Local
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Implicit vs. Explicit Information V
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Encapsulation Appl header user data
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• Transport layer • Port number
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IP “Protocol” field (RFC 1700)
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Decimal Keyword Protocol References
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Basic communication mechanism: data
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Common Used Simple Services Name TC
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Simple Campus Network WAN ISP’s r
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How important are switches vs. rout
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Ethernet Encapsulation (RFC 894) DS
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IEEE 802 Numbers of Interest “…
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SLIP Problems ⇒CSLIP ≡ Compress
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PPP: Point to Point Protocol PPP (R
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PPP summary • support for multipl
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Loopback interface summary • loop
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Using VIF for tunneling TCP UDP ...
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Figure 16: Start the program, then
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Figure 18: After capturing some pac
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Figure 19: Export the captured traf
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Importing in to a Microsoft Excel 1
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Figure 22: Final step -- Note that
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Using a Perl script #!/usr/bin/perl
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Choosing which columns to display F
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Figure 26: Save your parameters and
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Classful addressing Classically the
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Special Case IP Addresses IP Addres
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Classless Inter-Domain Routing (CID
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IP address assignments Internet Ser
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Problems with the dual functions of
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Standardization Organizations The m
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W. Richard Stevens • Born in Luan
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[12] Van Jacobson, "If a Clean Slat
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IP Basics Outline • IP Routing: D
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Routing The internet protocols are
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Forwarding • Next-Hop method - ro
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Forwarding module A simplified view
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Fast forwarding Mikael Degermark, A
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where ddd is some numeric value. Ro
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Host routing A host either: • kno
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Combining layers Many devices now c
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What to do with a new computer? We
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ARP ≡ Address Resolution Protocol
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Address Resolution Cache Since you
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ARP example 2 B FTPd C resolver (1)
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Gratuitous ARP Host sends a request
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ARP - as seen with ethereal Time So
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RARP: Reverse Address Resolution Pr
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RARP server Someone has to know the
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Novel IPX/SPX Addresses Another app
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tcpdump Under HP-UX 11.0 # ./tcpdum
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Tools Used: tcpdump Program tcpdump
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Maguire Wireshark (formerly Etherea
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Tools Used: sock Program • A simp
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#include #include #include #incl
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Wireshark’s IO Graph functionalit
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Interarrival delay and variance Fig
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Summary This lecture we have discus
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[10] Gianluca Insolvibile, “The L
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• IP • ICMP • Useful Diagnost
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checksum, and options fields. Magui
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MTU½≡Maximum Transmission Unit M
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Fields relevant to Fragmentation
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Serial line throughput At 9,000 bit
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7 {ECN Capable Transport (ECT) and
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Precedence Precedence values are de
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Precendence and telephony systems S
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TTL field Time To Live (TTL) (8 bit
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IPv4 Options • IPv4 options were
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Categories of IP Options • Single
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ICMP Port Unreachable Error Example
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PING: Packet InterNet Groper or son
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On a HP-UX 11.0 machine: ping -ov w
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Useful Tool: Traceroute Programs De
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This lecture we have discussed: •
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Transport layer protocols The trans
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User Datagram Protocol (UDP) • Da
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UDP Checksum and Pseudo-Header •
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Port numbers in three groups Range
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Fragmentation Required If datagram
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• on a BSDI system: • each of t
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With an even larger UDP packet I re
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Datagram truncation What if the app
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Learning about Socket programming F
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UDP server design Stevens, Vol, 1,
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Changed the client Changing the fol
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if (!(proto = getprotobyname("raw")
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ICMP Source Quench Error Since UDP
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No error control Since UDP has no e
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BOOTP continued When a request is s
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DHCP: Dynamic Host Configuration Pr
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• Message - used by a server to p
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DHCP’s importance • allows reus
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Example of dhcpd.conf ### Managed b
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Trivial File Transfer Procotol (TFT
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Mapping names to IP addresses Host
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Zones A zone is a subtree of the DN
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(see Stevens, Vol. 1, figure 14.2,
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Domain registrars Internet Corporat
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Resource Records (RR) See Stevens,
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Network names Conventions: • it.k
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Example: $ORIGIN it.kth.se. @ 1D IN
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How to give your host a name? Host
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Configuring DNS • Configuring the
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Load leveling [1] For example, f.ro
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Where is f.root-servers.net ? trace
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Dynamic Domain Name System (DDNS) R
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Attacks upon DNS • Denial of serv
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DNS performance - top 100 From www.
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Web performance - continued Using P
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Transport layer protocols • User
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Applications which use TCP Lots of
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TCP header continued Reliability is
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time client SYN, seq=x SYN, seq=y,
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client active close ACKs from clien
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Maximum Segment Size • The Maximu
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Window size Increasing window size
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Silly Window Syndrome If receiver a
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Disabling the Nagle Algorithm But s
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Resulting bulk data flow Every segm
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Congestion Avoidance So far we have
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Slow start In 1989, Van Jacobson in
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Round-Trip Time Measurement Fundame
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Congestion Avoidance Algorithm Slow
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Per-Route Metrics Newer TCPs keeps
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TCP Keepalive Timer No data flows a
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Long Fat Pipes Networks with large
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Example of TCP behavior 1 1. Figure
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Hypertext Transfer Protocol (HTTP)
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HTTP Requests request-line == reque
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HTTP Response Codes HTTP 3-digit re
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Server Redirect Response code 302,
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Decrease in total time to produce a
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HTTP Statistics Statistics for indi
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HTTP Performance Problems HTTP open
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Web Enabled Devices emWare - thin c
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Remote Procedure Call (RPC) Two ver
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External Data Representation (XDR)
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NFSspy Insert a new pointer in plac
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nfsspy Initial implementations were
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Often there are multiple NFS client
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NFS Mount protocol Server can check
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NFS over TCP Provided by some vendo
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X Window System • Client-server a
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X was optimized for use across LANs
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Additional tools for watching TCP P
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Transaction TCP (T/TCP) Piggyback a
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References [1] Information Sciences
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Transport layer protocols • User
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SCTP Applications • Initial goal
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• Type SCTP Chunk 0 7 8 15 16 23
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INIT Chunk 0 7 8 15 16 23 24 31 Typ
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INIT ACK Chunk 0 7 8 15 16 23 24 31
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COOKIE ECHO Chunk 0 7 8 15 16 23 24
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Data Chunk 0 7 8 15 16 23 24 31 Typ
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Selective Acknowledgement (SACK) Ch
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Association Termination Two forms o
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0 7 8 15 16 23 24 31 Type = 14 Flag
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ethereal capture - daytime - INIT F
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ethereal capture - daytime - COOKIE
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ethereal capture - daytime - DATA F
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ethereal capture - daytime - SHUTDO
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ethereal capture - daytime - SHUTDO
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HEARTBEAT and HEARTBEAT ACK Chunks
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Differences from TCP Congestion Con
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3 When retransmitting to a remote a
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Forward Cumulative TSN Allows an en
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SCTP Performance See the upcoming e
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2002 http://www.ietf.org/rfc/rfc330
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• Dynamic Routing Protocols Outli
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Routing Principles • Routing Mech
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Processing Rouing daemon route comm
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Autonomous systems (ASs) - RFC1930
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Routing Algorithms • Static vs. D
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Routing Information Protocol (RIP)
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When are routes sent? Solicited res
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Count to Infinity C network 1 netwo
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Triggered updates and Hold-Downs To
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Why would anyone use RIP? After all
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IGRP Metrics • a vector of metric
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IGRP Default Gateway Rather than us
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Open Shortest Path First (OSPF) OSP
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OSPF building blocks 1. Hello proto
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Hello packet 0 7 8 15 16 23 24 31 V
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Link State Announcement (LSA) heade
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Link state update packet 0 7 8 15 1
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Link state acknowledgement packet 0
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Exterior Gateway Protocol (EGP) an
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Local vs. Transit traffic Local tra
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BGP does not transmit metrics. Howe
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Redistribution of Route Information
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• Open • Update • Keepalive
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BGP Update Message 0 7 8 15 16 23 2
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BGP Notification Message 0 7 8 15 1
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Federal Internet eXchange (FIX) A t
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Global Internet eXchange (GIX) Glob
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Network Access Points (NAPs) At the
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Router Arbiter Project Router Arbit
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Euro6IX The European IPv6 Internet
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Flows A flow is defined as a “uni
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A Tag Edge router labels a packet b
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Creating tags Since tag switching d
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[14] R. Hinden (Editor), “Applica
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• Multicast • IGMP • RSVP Out
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Broadcast and Multicast Traditional
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Broadcasting • Limited Broadcast
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Alternative centralized model CU-Se
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IP Multicast scales well • End-no
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Steve Deering’s Multicast Dynamic
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Multicasting IP addresses Multicast
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Converting Multicast Group to Ether
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Problems Unfortunately many links d
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How does IGMP fit into the protocol
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IGMP Implementation Details In orde
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IGMP Version 2 [3] Allows a host to
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IGMP - ethereal Figure 7: IGMP pack
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Frame 2: IGMP v2 Membership Report
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Frame 15: IGMP v2 Leave Group Ether
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Therefore a Multicast Router • Li
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Multicast Routing - Flooding • ma
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Multicast Routing - Spanning Trees
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Reverse -Path Forwarding (RPF) RPF
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Reverse Path Broadcast (RPB) • We
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Distance-Vector Multicast Routing P
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Core-Based Trees (CBT) A fixed poin
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Multiprotocol BGP (MBGP) [10] Exten
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Telesys class was multicast over MB
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MBONE Chronology Nov. 1988 Small gr
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For the some statistics see: http:/
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mrouted mrouted UNIX deamon tunneli
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GLOP addressing Traditionally multi
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Other multicast efforts PGM: Pragma
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SNMP-based tools and multicast rela
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SNMP tools for working with multica
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RSVP: Resource Reservation Setup Pr
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Resource Reservation • Interarriv
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Capacity Assignment • end-nodes a
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RSVP Soft State • “soft state
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RSVP operations (continued) • At
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Argument against Reservation Given,
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[13] B. Fenner and D. Meyer (Editor
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• Network Management • SNMP •
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Network Management Process Network
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Version 1 SNMP Version 2 - in 1992-
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SNMP • SNMPv1 • only 5 commands
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Case Diagram To understand the rela
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Remote MONitoring (RMON) [ RMON MIB
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RMON1 Statistics Information collec
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EtherStatsEntry ::= SEQUENCE { ethe
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HostEntry ::= SEQUENCE { HostEntry
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The Matrix Group Matrix group consi
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Information collected from network
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Network Management Systems • HP O
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• Web based Interfaced Management
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DMI 2.0 has three groups: • Compo
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Common Information Model (CIM) •
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Inter-domain Management task force
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Applications • E-mail • E-mail
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Deregulation ⇒ New regulations
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Latency 1 Usability FAX relay/broad
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Voice Gateway 2B+D or 30B+D or …
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Fax Support Both store-and-forward
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Cisco Voice Over IP Enables Cisco 3
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2,400/4,800/7,200/9,600/14,400 bps
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“The wireless workplace will soon
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Carriers offering VOIP “Equant, a
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Economics "Can Carriers Make Money
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Patents Mixing voice and data in th
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Deregulation ⇒ Trends • replaci
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RTP: Real-Time Transport Protocol D
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SIP: Session Initiation Protocol SI
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SIP Invite 1 INVITE sip:bob@biloxi.
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SIP Methods Method Invite Bye Optio
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ENUM IETF’s E.164 Number Mapping
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Web Services Using protocols built
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Internet Protocol Version 6 (IPv6)
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• Wireless computers • supporti
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Device Control • Control everyday
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IPv6 header format version 4 bits C
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Simplifications IPv6 builds on 20 y
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Payload length Payload length is th
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Extension headers • Each header i
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Writing an IPv6 address The 128 bit
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Binary prefix Hex. prefix Fraction
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Interface ID Must be unique to the
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Link local addresses Link local add
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Permanently assigned groups For exa
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Prefix for IPv6 documentation The I
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IPv6 Routing • all standard routi
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Fragment header Next Header (8 bits
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intermediate relays on the way to t
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Security • Header Authentication
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IPv6 ICMP [13] Type (8 bits) Code (
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IPv6 ICMP Echo Request/Reply (PING)
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Summary of IPv6 ICMP • incorporat
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IPv6 Transition Mechanisms • Incr
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IPv6 networks 6Bone - http://www.6b
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If things are to be connected they
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Where are ISPs? “… There is evi
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[13] A. Conta and S. Deering, “In
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Emerging Network Architecture H …
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Updating after a move Host name:
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Communication from Z to X γ Z C X
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Identification γ Z C Y B α γ Z C
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How did it know to send the “I am
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Getting Service Once it’s identit
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Alternative 1 Initially X is locate
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Alternative 3 Initially X is locate
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Alternative 4 continued Initially X
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What happens in the case of wireles
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Wireless WANs BS-a cell a BS-a cell
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Mobile IP Standardization Effort
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A Mobile-IP(V6) Scenario Home Agent
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Tunneling IP Datagrams Both home ag
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Why Agent Discovery? Agent Discover
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Registration Message Format 0 8 16
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FA Requirements (v4) • Each FA mu
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Optimization Problem Home site Inte
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Mobile IP Problems and Development
Page 741 and 742:
Wireless IP Network Architecture Ho
Page 743 and 744:
HAWAII extension is similar to Cell
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Hierarchical FA and Regional Tunnel
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Hierarchical FA and Regional Tunnel
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Page 751 and 752:
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Private networks Private Networks a
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Security Protocols, APIs, etc. •
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IPSec IPSec in three parts: • enc
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AH header For authentication purpos
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Where can you run IPSec? Mode Where
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Linux firewall For example, for the
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Proxy Access Through A Firewall ext
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Newping http://ftp.cerias.purdue.ed
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Secure Mailer (aka Postfix) Wietse
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• TCP Wrappers - allows monitorin
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Network Address Translation exterio
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Network Security Exercises You will
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Page 779 and 780:
[13] Swedish Defense Material Admin
Page 781 and 782: IK1550 Internetworking/Internettekn
Page 783 and 784: Generations of technology versus ge
Page 785 and 786: Dissemination not conversation On s
Page 787 and 788: Are interplanetary and intergalacti
Page 789 and 790: Trends: Shifting from traditional t
Page 791 and 792: Visualizing these laws 100 25000 80
Page 793 and 794: Exponential growth As Ray Kurzweil
Page 795 and 796: Is this only true for books? Chris
Page 797 and 798: Too cheap to meter "It is not too m
Page 799 and 800: What Would Google Do? Jeff Jarvis
Page 801 and 802: Service Differentiation Integrated
Page 803 and 804: Mobile ad hoc Networks (MANETs) Ad
Page 805 and 806: PC interfaces Standard I/O ports of
Page 807 and 808: IP Storage Area Networks (SANs) Usi
Page 809 and 810: • Internet SCSI (iSCSI) JBOD == J
Page 811 and 812: “Beowulf-class” machines Using
Page 813 and 814: Internet2 http://www.internet2.org/
Page 815 and 816: Speed through Silicon FPGAs used in
Page 817 and 818: Active Networks • Network nodes c
Page 819 and 820: Smart Networks with Sensors (Ren an
Page 821 and 822: Future of the Internet An important
Page 823 and 824: Clean slate re-design of the Intern
Page 825 and 826: Is an hourglass the right model? Ru
Page 827 and 828: Wikinomics Don Tapscott and Anthony
Page 829 and 830: Resource pooling examples Resource
Page 831: What kinds of things might be inter
Page 835 and 836: • Vehicle maintenance: diagnostic
Page 837 and 838: Buildings Heating, Ventilation, and
Page 839 and 840: Infrastructure • Is their ice on
Page 841 and 842: Is saying “Internet of xxx” mis
Page 843 and 844: • Server and Network Bandwidth an
Page 845 and 846: Evolution of new varieties of netwo
Page 847 and 848: How do I know where I am? Location
Page 849 and 850: Requirements • Systems with which
Page 851 and 852: Badge Communications Model Badges a
Page 853 and 854: Smart Badge Sensors Details of the
Page 855 and 856: A view of the packaged badge As sho
Page 857 and 858: Split the functions between access
Page 859 and 860: Personal Computing and Communicatio
Page 861 and 862: Future Systems Audio I/O GPS source
Page 863 and 864: Non-metalic bi-directional neural i
Page 865 and 866: Spotting trends at 1% Mark J. Penn
Page 867 and 868: Further Reading [1] Kalevi Kilkki,
Page 869 and 870: [23] Darwin Valderas Núñez, “In
Page 871 and 872: Thanks Best wishes on your written
Page 873 and 874: Internets - configuration 1 Figure
Page 875 and 876: Adding a firewall and router Intern
Page 877 and 878: Adding a WiMAX link Internets - con
Page 879: Adding two-way multimedia Configura
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