IPv6 Network Administration by Niall Richard Murphy; David Malone

Author:Niall Richard Murphy; David Malone
Language: eng
Format: mobi
Tags: Reference:Computers
ISBN: 9780596553258
Publisher: O'Reilly Media
Published: 2005-01-02T00:00:00+00:00

freebsdhost% traceroute6 -n 2001:db8:10:200::86e2:5103

traceroute6 to 2001:db8:10:200::86e2:5103 (2001:db8:10:200::86e2:5103) from

2001:db8:68:ff::1, 30 hops max, 12 byte packets

1 2001:db8:68:ff::2 0.779 ms 0.721 ms 0.669 ms

2 2001:db8:8:9::1 3.719 ms 3.409 ms 3.269 ms

3 2001:db8:8:3::2 4.527 ms 4.606 ms 3.966 ms

4 2001:db8:8:4::2 4.649 ms 4.294 ms 4.374 ms

5 2001:db8:10:100::86e2:a33 4.997 ms 6.483 ms 5.125 ms

6 * * *

7 * * *

8 * * *

9 *^C

freebsdhost% traceroute6 -n 2001:db8:100:300::86e2:5103

traceroute6 to 2001:db8:100:300::86e2:5103 (2001:db8:100:300::86e2:5103) from

2001:db8:68:ff::1, 30 hops max, 12 byte packets

1 2001:db8:68:ff::2 0.786 ms 0.701 ms 0.647 ms

2 2001:db8:8:9::1 9.608 ms 3.649 ms 3.298 ms

3 2001:db8:18:2:201:3ff:fe2c:960c 4.142 ms !A 3.936 ms !A 4.167 ms !A

As we have mentioned, path MTU discovery is an important part of IPv6 because IPv6 routers are not permitted to fragment packets. If some firewall between you and the destination does not allow ICMPv6 Packet Too Big messages through, then Path MTU discovery may not work correctly. The usual symptom is that TCP connections involving interactive or slow transfers work OK, but large or fast transfers hang unexpectedly and then time out. Some versions of traceroute, or variants of it such as Linux's tracepath can display Path MTU information, which may help diagnose this sort of problem.

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