Keep-alive does not keep the connection alive

Hendrik Friedel hendrik at
Sun Aug 25 20:44:53 CEST 2019


thanks for your reply.
It is linux (Kernel 5.x) in both cases.


------ Originalnachricht ------
Von: "Vasili Pupkin" <diggest at>
An: "Hendrik Friedel" <hendrik at>
Cc: wireguard at
Gesendet: 25.08.2019 17:59:59
Betreff: Re: Keep-alive does not keep the connection alive

>What OS is running on client side? I have this issue on Win7 client,
>can explain it further, it has nothing to do with keepalives though,
>it is a bug in tun adapter implementation
>On Sun, Aug 25, 2019 at 6:38 PM Hendrik Friedel <hendrik at> wrote:
>>  I have a setup in which the Server IP is known, whereas the Client IP is changing. Thus, I rely on the Client to connect to the Server. I want the Client to keep the connection alive all the time though, so that the Server can also initiate a connection to the Server when needed. Both, client and server are behind a NAT/Router.
>>  I would think, that the "PersistentKeepalive = 25" on the Client would ckeep the connection open. The connection works fine while used. But after a while, I cannot connect from the Server to the client anymore.
>>  I would assume that a ping from the Client to the IP of the endpoint would help to re-alive the connection - but it does not.
>>  Only after a wg-quick down and up all is fine again.
>>  Below some more information.
>>  Can you help me to find, what I am doing wrong?

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