In case it's useful to anyone else, here's the commands I'm running to
start/stop my VPN, without making any changes to the strongswan config, and
work around the issues above.
Start VPN:
sudo systemctl restart systemd-networkd.service # to avoid the error Unit
dbus-org.freedesktop.network1.service not found
# Start the VPN - expect errors about assigning DNSs to the "lo" interface
sudo swanctl -i -c child_name_goes_here
# Get interface of default route with the lowest metric
iface=$(ip -j route | jq -r '.[] | select(.dst == "default") | .dev + " " +
(.metric // 1000000 | tostring)' | sort -k2 -n | head -n1 | cut -d ' ' -f1)
# Add known name servers, eg
sudo resolvectl dns $iface 10.0.0.1 10.0.0.2
# Add search path
sudo resolvectl domain $iface mydomain.com my.other.domain.com
And to stop the VPN:
sudo swanctl -t -i child_name_goes_here
# Get interface of default route with the lowest metric
iface=$(ip -j route | jq -r '.[] | select(.dst == "default") | .dev + " " +
(.metric // 1000000 | tostring)' | sort -k2 -n | head -n1 | cut -d ' ' -f1)
# Drop the interface, in order to bring it up again and reset its
nameservers. This takes a while
sudo ip link set $iface down
while sudo resolvectl dns $iface | grep -q 10.0.0.1 ; do
echo " waiting for $iface to go down"
sleep 1
done
sudo ip link set $iface up
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https://bugs.launchpad.net/bugs/2067897
Title:
Ubuntu 24.04 does not install resolvconf uses systemd-resolved instead
which is broken
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https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/2067897/+subscriptions
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