lost connection on dynamic IP

Roman Mamedov rm at romanrm.net
Wed May 19 18:43:10 UTC 2021

On Tue, 18 May 2021 13:22:31 +0200
Vicente Bergas <vicencb at gmail.com> wrote:

> A server connected to the Internet through an ISP that provides a
> dynamic IP with NAT.

If it's NAT, then your server has no dedicated public IP? What do you update
to DNS, IP of the ISP's NAT pool (shared IP with many other customers)?

> I think the issue happens when the ISP on the server side shuts down
> the Internet connection for more than 1 hour! Then, it is restored
> with a new IP.
> inadyn detects the new IP and updates the DNS.
> At this point the Internet connection is operational again, but the
> client remains disconnected until rebooted.
> Is this scenario expected to work due to the "Built-in Roaming" ?

It might work, helped by PersistentKeepalive, and as long as the server and the
client don't change their IPs/ports *at the same time*. To protect against
that, or to improve resiliency in general (and assuming there's actually no NAT
at the server side after all), your client should resolve the DNS record for
the server periodically, and in case the IP changed, call "wg set [interface]
peer [key] endpoint [IP:port]".

With respect,

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