Can confirm the same behaviour on my systems too. Updating systemd
recently caused the entire routing table to be dropped (I had console
access and was able to confirm no routes - not even loopback worked). In
normal operation I see:
>ip route show
default via 10.0.0.1 dev eno1 src 10.0.0.60 metric 202
10.0.0.0/24 dev eno1 proto dhcp scope link src 10.0.0.60 metric 202
However, when systemd is updated, the route table is blank although
interfaces maintain their addresses etc. When working remotely, I need
to get remote hands to reboot the system to restore normal functionality
which obviously extends down time. We have implemented procedures to
watch the route table and if it disappears, triggers a reboot but this
is problematic as it could happen before the update process is finished.
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https://bugs.launchpad.net/bugs/1782709
Title:
Updating systemd kills network on bionic
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