Virtual Private Network - the Netgroup at Politecnico di Torino

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Enhanced GRE (version 1) • Deployed by PPTP • Acknowledgment Number • Delivery of packets by remote end-point can be notified ack. flag 0 8 16 24 31 C R K S s Recur A Flags 1 (ver) Protocol Type Key (HW) Payload Length Key (LW) Call ID Sequence Number (Optional) Acknowledgment Number (Optional) VPN - 40 © M. Baldi & L. Ciminiera: see page 2
New fields • Key (high 16 bit) • Payload length: no. of bytes excluding GRE header • Key (low 16 bit) • Call ID: session ID for this packet • Sequence number • Present if the S flag is set • Acknowledge number • Highest sequence number of a GRE packet received for this session (cumulative ack) VPN - 41 © M. Baldi & L. Ciminiera: see page 2
Page 1 and 2: VPN Virtual Private Network Mario B
Page 3 and 4: A Definition Virtual Private Networ
Page 5 and 6: Why VPN? VPNs enable cutting costs
Page 7 and 8: Why VPN? VPN enable selective and f
Page 9 and 10: Example VPN - 9 © M. Baldi & L. Ci
Page 11 and 12: VPN Deployment Scenarios • Intran
Page 13 and 14: Intranet characteristics • Secure
Page 15 and 16: Extranet VPN • Restricted access
Page 17 and 18: Remote User Access • Shared infra
Page 19 and 20: Example of intranet VPN VPN - 19 ©
Page 21 and 22: Internet Access • Centralized (co
Page 23 and 24: Distributed Internet Access INTERNE
Page 25 and 26: VPN Models • Peer Model • MPLS
Page 27 and 28: Provider provisioned and customer p
Page 29 and 30: Layer 2 VPNs • Virtual Private LA
Page 31 and 32: A Tassonomy of VPN Technologies VPN
Page 33 and 34: VPN Components VPN - 33 © M. Baldi
Page 35 and 36: Tunneling • A and B are enterpris
Page 37 and 38: GRE • Generic Routing Encapsulati
Page 39: IPv4 Encapsulation and Routing Info
Page 43 and 44: Access VPN: Two Deployment Modes VP
Page 45 and 46: Highlights of Virtual Dial-Up • A
Page 47 and 48: Layer 2 Tunneling Protocol Original
Page 49 and 50: L2TP Header • Control Message •
Page 51 and 52: Other header fields • Ns • Nr
Page 53 and 54: Tunnels and sessions • Multiple s
Page 55 and 56: Establishing sessions • A session
Page 57 and 58: Security issues • Tunnel endpoint
Page 59 and 60: Point-to-Point Tunneling Protocol (
Page 61 and 62: PPTP Header Length Magic cookie Dat
Page 63 and 64: Authentication Header Protocol (AH)
Page 65 and 66: IPsec VPNs IPsec tunnel between VPN
Page 67 and 68: IPSec modes of operation • Tunnel
Page 69 and 70: Internet Key Exchange (IKE) protoco
Page 71 and 72: VPN Gateway Positioning VPN - 71 ©
Page 73 and 74: IPsec, VPN Gateways and NATs • Au
Page 75 and 76: Peer VPN and MPLS-based Solutions V
Page 77 and 78: MPLS-based Layer 2 VPNs: PWE3 • P
Page 79 and 80: MPLS-based Layer 3 VPNs • Provide
Page 81 and 82: MPLS VPN Components • CE router c
Page 83 and 84: Control Plane • Establishment of
Page 85 and 86: Packet Routing • PE2 looks-up VRF
Page 87 and 88: Benefits • No constraints on addr
Page 89 and 90: MPLS/Virtual Router VPNs • PEs ex
Page 91 and 92:
References • E. Rosen and Y. Rekh
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Virtual Private Network - the Netgroup at Politecnico di Torino

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