As a workaround, I placed the following script in
/etc/NetworkManager/dispatcher.d/02-vpnupdown location. It will restart
systemd-resolved service everytime you bring up a vpn connection
allowing to use as current dns the one provided by the vpn. I tried to
send a SIGRTMIN+1 signal to systemd-resolve to flush dns server but it
randomly have the desired effect by cli but never by a script triggered
by a vpn-up event from network-manager. On vpn-down event, dns
configuration is fine so I won't restart the service to avoid restarting
it too often.
Hope this will help someone while this issue is being fixed.
#!/bin/bash
STATUS=$2
case "$STATUS" in
'vpn-up') systemctl restart systemd-resolved;;
esac
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https://bugs.launchpad.net/bugs/1880864
Title:
networkmanager IKE VPN connection causes DNS leak
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