clients sometimes need to ping outside world in order to be pinged by other clients

[John Connolly]

occasionally, some of the clients on our vpn stop responding to pings from other clients on the vpn.
These issues occur on Ubuntu 18.04 and 20.04 clients

If we ssh into the offending client through another network interface and ping any internet address or vpn client address, then the offending client starts responding to pings again.

we've set the param BetweenClients_DROP: false which is what allows communication to work normally.

[David Myers]

If there's a firewall between your AlgoVPN server and the "offending" client then the problem might be that the firewall states are expiring when the client is idle for a while. Try adding:

PersistentKeepalive = 25

to the client's WireGuard configuration so that it sends regular traffic and keeps the firewall states current.

[John Connolly]

I will try that and wait a few weeks to see if the issue is gone

[David Myers]

If PersistentKeepalive solves your problem you can have Algo add it to your WireGuard configs the next time you deploy a server by setting wireguard_PersistentKeepalive in config.cfg.

[John Connolly]

This did solve my problem, I will close the issue. Thank you!