AIX Version 4.3 Differences Guide
AIX Version 4.3 Differences Guide
AIX Version 4.3 Differences Guide
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Anycast<br />
• Site-local<br />
– Valid only on hosts sharing a site with the source node (for<br />
example, multicasts within IBM Austin).<br />
– Prefix is ff05::/16 or ff15::/16.<br />
• Organization-local.<br />
– Valid only on hosts sharing organization with the source node<br />
(for example, multicasts to all of IBM).<br />
– Prefix is ff08::/16 or ff18::/16.<br />
• The 0 or 1 part in these prefixes indicates whether the address is<br />
permanently assigned (1) or temporarily assigned (0).<br />
An identifier for a set of interfaces (typically belonging to different<br />
nodes). An anycast address is an address that has a single sender,<br />
multiple listeners, and only one responder (normally the nearest one,<br />
according to the routing protocols' measure of distance). An example<br />
may be several Web servers listening on an anycast address. When a<br />
request is sent to the anycast address, only one responds.<br />
Anycast addresses are indistinguishable from unicast addresses. A<br />
unicast address becomes an anycast address when more than one<br />
interface is configured with that address.<br />
Note: There are no broadcast addresses in IPv6, their function being<br />
superseded by multicast addresses.<br />
7.1.3 Neighbor Discovery/Stateless Address Autoconfiguration<br />
Neighbor Discovery (ND) protocol for IPv6 is used by nodes (hosts and routers)<br />
to determine the link-layer addresses for neighbors known to reside on attached<br />
links and maintain per-destination routing tables for active connections. Hosts<br />
also use Neighbor Discovery to find neighboring routers that forward packets on<br />
their behalf and detect changed link-layer addresses. Neighbor Discovery<br />
protocol (NDP) uses the ICMPv6 protocol with a unique message types to<br />
achieve the above function. In general terms, the IPv6 Neighbor Discovery<br />
protocol corresponds to a combination of the IPv4 protocols Address Resolution<br />
Protocol (ARP), ICMP Router Discovery (RDISC), and ICMP Redirect (ICMPv4),<br />
but with many improvements over these IPv4 protocols.<br />
IPv6 defines both a stateful and stateless address autoconfiguration mechanism.<br />
Stateless autoconfiguration requires no manual configuration of hosts, minimal (if<br />
any) configuration of routers, and no additional servers. The stateless<br />
mechanism allows a host to generate its own addresses using a combination of<br />
locally available information and information advertised by routers. Routers<br />
advertise prefixes that identify the subnet(s) associated with a link, while hosts<br />
generate an interface-token that uniquely identifies an interface on a subnet. An<br />
address is formed by combining the two. In the absence of routers, a host can<br />
only generate link-local addresses. However, link-local addresses are sufficient<br />
for allowing communication among nodes attached to the same link.<br />
7.1.3.1 NDP Application Kernel Support<br />
For kernel function, a new version of the netinet kernel extension has been<br />
provided that contains code to handle both IPv4 and IPv6. New special<br />
processing handled by the kernel (or NDP applications) includes:<br />
150 <strong>AIX</strong> <strong>Version</strong> <strong>4.3</strong> <strong>Differences</strong> <strong>Guide</strong>
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