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AIX Version 4.3 Differences Guide

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Error messages are identified by having a zero in the high-order bit of their<br />

message Type field values. Thus, error messages have message Types from 0 to<br />

127. Table 28 lists the different types and their meanings.<br />

Table 28. ICMPv6 Error Messages<br />

Type Description Code Cause<br />

1 Destination unreachable 0 No route to destination<br />

1 Communication with<br />

destination administratively<br />

prohibited<br />

2 Not a neighbor<br />

3 Address unreachable<br />

4 Port unreachable<br />

2 Packet too big 0 Packet too big<br />

3 Time exceeded 0 Hop limit exceeded in transit<br />

1 Fragment reassembly time<br />

exceeded<br />

4 Parameter problem 0 Erroneous header field<br />

encountered<br />

1 Unrecognized Next Header<br />

type encountered<br />

2 Unrecognized IPv6 option<br />

encountered<br />

Informational messages have message Type values from 128 to 255. Table 28<br />

lists the information types and their meanings.<br />

Table 29. ICMPv6 Informational Messages<br />

Type<br />

Description<br />

128 Echo request<br />

129 Echo reply<br />

130 Group membership query<br />

131 Group membership report<br />

132 Group membership reduction<br />

Note: For more detailed information relating to message types and formats, refer<br />

to RFC 1885.<br />

7.1.5 Tunneling over IPv4<br />

The key to a successful IPv6 transition is compatibility with the existing installed<br />

base of IPv4 hosts and routers. Maintaining compatibility with IPv4, while<br />

deploying IPv6, streamlines the task of transitioning the Internet to IPv6.<br />

In most deployment scenarios, the IPv6 routing infrastructure will be built-up over<br />

time. While the IPv6 infrastructure is being deployed, the existing IPv4 routing<br />

infrastructure can remain functional and can be used to carry IPv6 traffic.<br />

152 <strong>AIX</strong> <strong>Version</strong> <strong>4.3</strong> <strong>Differences</strong> <strong>Guide</strong>

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