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Bug #2674

closed
KT

MTU setting hardcoded 1280 for gif interfaces and in RADVD config

Bug #2674: MTU setting hardcoded 1280 for gif interfaces and in RADVD config

Added by Keenan Tims almost 14 years ago. Updated about 13 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
-
Category:
Interfaces
Target version:
2.1
Start date:
11/06/2012
Due date:
% Done:

100%

Estimated time:
Plus Target Version:
Release Notes:
Affected Version:
2.1-IPv6
Affected Architecture:

Description

The MTU setting in the GUI for gif interfaces is ignored, and set to hardcoded or default value of 1280. Likewise, RADVD advertises a hardcoded link MTU, which should be read from interface config / appropriate defaults for link type.

SM Updated by Seth Mos almost 14 years ago Actions
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 #1

Indeed I did. Do we want to always advertise the local interface MTU or the WAN MTU?

CB Updated by Chris Buechler almost 14 years ago Actions
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 #2

  • Category set to Interfaces
  • Target version set to 2.1
  • Affected Version set to 2.1-IPv6

Normally I'd say the local interface MTU, but since there's no MSS clamping on v6 for the time being, probably the WAN MTU is best to avoid issues.

EL Updated by Ermal Luçi over 13 years ago Actions
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 #3

  • Status changed from New to Feedback
  • % Done changed from 0 to 100

Applied in changeset commit:a6bc492fecd64a3a9f3b4cc4a003d6761494a694.

AT Updated by Adam Thompson about 13 years ago Actions
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 #4

As of {2.1-RC1 (amd64) built on Tue Aug 13 14:23:15 EDT 2013 FreeBSD 8.3-RELEASE-p9}, GIF tunnels still default to 1280. I can override up to 1480 and that appears to work correctly, but I am seeing strange fragmentation problems no matter what MTU I use.

CB Updated by Chris Buechler about 13 years ago Actions
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 #5

  • Status changed from Feedback to Resolved

The "strange fragmentation problems" are a separate issue entirely (current PF has issues w/v6 frags).

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