[radvd-devel-l] Changing MTU with radvd (AdvLinkMTU in radvd.conf)

Jim Paris jim at jtan.com
Mon Mar 31 04:15:16 EDT 2008

David Shwatrz wrote:
> Any idea why the MTU was not changed from 1500 to 1495 on that host?

Pekka Savola wrote:
> However, if you did tcpdumps of traffic, you should see that v6 connections 
> use the lower MTU.  Otherwise the client OS MTU calculation has a bug.


Linux kernel 2.6.24 and earlier have a bug.  I provided a patch here:
and I believe it was applied in 2.6.25-rc1.


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