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I'm currently troubleshooting some network issues on Ubuntu 18.04 LTS Bionic.
After checking a few logs I noticed that the networkd-dispatcher is generating
errors. I'm unsure if this is a bug but I'd like to report it over here just to
be sure:
```
Jun 04 18:14:21 [servername] systemd-networkd-wait-online[2079]: managing: br2
Jun 04 18:14:22 [servername] networkd-dispatcher[1890]: WARNING:Unknown index 7
seen, reloading interface list
Jun 04 18:14:23 [servername] networkd-dispatcher[1890]: WARNING:Unknown index 8
seen, reloading interface list
Jun 04 18:14:23 [servername] networkd-dispatcher[1890]: ERROR:Unknown interface
index 8 seen even after reload
Jun 04 18:14:23 [servername] networkd-dispatcher[1890]: WARNING:Unknown index 8
seen, reloading interface list
Jun 04 18:14:23 [servername] networkd-dispatcher[1890]: ERROR:Unknown interface
index 8 seen even after reload
```
These issues occur consistently on several servers. The problem is that
I lose the connection specifically towards the internet after approx.
15 minutes. Internal facing interfaces (same hardware and driver) seem
to behave differently and remain properly connected to the internal
network. These network-dispatcher errors seem to occur simultanously
when the connection on the external interface permanently drops.
The physical network links still appears to be online when the
connection is lost.
I'm still also able to ping the default gateway from my provider to
access the Internet. But all IP addresses beyond this gateway on the
Internet seem to be unreachable.
I have disabled TCP offloading and firewalls to eliminate any influences. But
that didn't work.
The ARP table shows that my gateway is a STALE record after the connection
drops. So it seems related to the ARP-table or something likewise.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: bot-comment
--
Ubuntu 18.04 networking issue (connection drops after approx. 15 minutes)
https://bugs.launchpad.net/bugs/1775131
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