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Bug #6868

closed

Interface MTU Setting not applied to all IPv6 routes

Added by Daryl Morse about 8 years ago. Updated over 4 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
Luiz Souza
Category:
Interfaces
Target version:
2.5.0
Start date:
10/20/2016
Due date:
% Done:

100%

Estimated time:
Plus Target Version:
Release Notes:
Affected Version:
All
Affected Architecture:

Description

Running 2.3.2_1 using an HE/64 tunnel. Adjusting MTU to troubleshoot possible PMTUD problem. Found that setting for MTU in Interfaces / OPT1 only changes MTU for default route, but not for other gif0 routes. MTU of 1280 is applied to other routes.

default 2001:abc:c:1111::1 (MTU changed by OPT1 setting)
2001:abc:c:111::1 link#7 (MTU not changed)
fe80::%gif0/64 link#7 (MTU not changed)
ff01::%gif0/32 2001:abc:c:1111::2 (MTU not changed)
ff01::%gif0/32 2001:abc:c:1111::2 (MTU not changed)

Used command prompt route -6 change <route> -mtu 1480 to change MTU. After disabling OPT1 and enabling OPT1, MTU reset back to 1280.

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