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Re: Debian 13 - Dosent adjust MTU on IPv6



On Mon, Nov 17, 2025 at 01:29:42PM +0100, Kenneth wrote:
> Hi,
> 
> New on this list, so sorry if this topic already is active.
> 
> Im just trying to configure my network, which is with multople routers
> running OpenWRT 24.10.3.
> I use B.A.T.M.A.N. on this, so the MTU is set to 1468, and the routers do
> send RAs, but my devices running Debian 13.x does not seem to change their
> MTU to 1468.
> 
> Is this a known issue?

Hm. No idea. What does cat /proc/sys/net/ipv6/conf/<your interface>/accept_ra_mtu
say? And cat /proc/sys/net/ipv6/conf/all/accept_ra_mtu?

(stabbing in the dark...)

Cheers
-- 
t

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