Good find in comment #3. Adding this policy-based routing (PBR) rule
manually seems to fix the issue:
# ip rule add from 192.168.12.6 lookup 101 proto static
But it's defined in Netplan config:
"""
routing-policy:
- table: 101
from: "192.168.12.6"
"""
And rendered to systemd-networkd:
"""
[RoutingPolicyRule]
From=192.168.12.6
Table=101
"""
When removing the "use-routes" dhcp-overrides for ens6 and running "netplan
apply" it seems to be working. Are those DHCP routes needed? This sounds like a
race condition. Maybe the static routes/rules are set, but then dropped when
the DHCPv4 response is received and routes/rules are reconfigured.
I wonder why this is not happening in Oracular, though. Can you confirm
timing of DHCPv4 config vs static routes/rule config from systemd-
networkd debug log?
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https://bugs.launchpad.net/bugs/2101860
Title:
Different networking behavior with 2nd IP on 2nd NIC
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