Hi Russ, Russ Allbery <[email protected]> (2018-03-12): > Package: systemd > Version: 232-25+deb9u2 > Severity: important > Tags: ipv6 > > systemd 232-25+deb9u2 breaks IPv6 configuration with systemd-networkd > if the RA doesn't include an MTU. This is a regression from 232-25+deb9u1 > and breaks all IPv6 networking on the system in this network configuration.
I'm very sorry for that…
> This is presumbly due to the fix for #878162.
>
> After upgrading to 232-25+deb9u2, I got error messages in the logs every
> minute:
>
> Mar 12 18:02:08 haven systemd-networkd[25396]: eth0: Failed to get default
> router MTU from RA: No data available
Yeah, that seems very likely… Even if the word regression or the commit
ID doesn't appear in the commit message, the follow-up commit seems to
fix this specific issue:
commit 29b5ad083a6925efec8e188013d1298742e0baaa
Author: Jörg Thalheim <[email protected]>
Date: Mon Dec 19 15:34:07 2016 +0100
networkd-ndisc: handle missing mtu gracefully (#4913)
At least bird's implementation of router advertisement does not
set MTU option by default (instead it supplies an option to the user).
In this case just leave MTU as it is.
→
https://github.com/systemd/systemd/commit/29b5ad083a6925efec8e188013d1298742e0baaa
Regarding the other pair of functions getting the return code checked
(sd_netlink_message_open_container & sd_netlink_message_close_container)
there doesn't seem to be any follow-up commits touching that file in
these areas… I'm not sure netlink operations are likely to fail anyway
(except for ENOMEM situations), so that's probably fine?
> It's possible that this means the local IPv6 routing environment is
> not correctly configured, but since this change was made in a stable
> update and IPv6 was working perfectly prior to this change, it still
> feels like a relatively serious regression to me.
Definitely, sorry for having proposed that commit without spotting it.
I can build a patched systemd with this extra cherry-pick for you to
double check; I'll post a link once it's available.
Cheers,
--
Cyril Brulebois ([email protected]) <https://debamax.com/>
D-I release manager -- Release team member -- Freelance Consultant
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