** Changed in: systemd (Ubuntu Artful)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1718771
Title:
Incorrect handling of link-local IPv6 DNS servers
Status in systemd package in Ubuntu:
Confirmed
Status in systemd source package in Artful:
Confirmed
Bug description:
We've recently seen odd looking DNS failures on autopkgtest:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-artful/artful/amd64/d/docker.io/20170921_065231_181b8@/log.gz
This shows a fe80:: link-local IPv6 address as one of the DNS servers
on the interface. That's because dnsmasq includes both the link-local
and global addresses of its DNS server in the router advertisement.
systemd-networkd appears to pick that up and send it to resolved,
which includes it in its config but apparently doesn't know how to
actually query it, leading to the failure above.
This is racy because once DHCPv4 completes, the resolved config will then
work properly again.
I've confirmed that dnsmasq properly answers on all addresses:
http://paste.ubuntu.com/25588197/
I've uploaded a workaround for this issue as part of the docker.io package.
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