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From: "Ivan Labáth" <labawi-wg@matrix-dream.net>
To: Hendrik Friedel <hendrik@friedels.name>
Cc: wireguard@lists.zx2c4.com
Subject: Re: Keep-alive does not keep the connection alive
Date: Wed, 28 Aug 2019 06:54:11 +0000
Message-ID: <20190828065411.GA6914@matrix-dream.net> (raw)
In-Reply-To: <em05f3a9de-8e41-4353-affa-3fb52e65cda8@ryzen>

Hello,

I was asking about server ip in the live wg config
on the client, as seen in
# wg show
in order to verify the problem is indeed a stale ip.

On Wed, Aug 28, 2019 at 06:25:15AM +0000, Hendrik Friedel wrote:
> that seems not to be the intended behaviour:
> If I understand correctly, the current behaviour is:
> 
> At tunnel start the IP is resolved
> This IP is used for ever, namingly for re-connects.
This is only partly correct. The remote endpoint can unconditionally
roam and is updated by any valid packet from a given IP (if I remember
correctly).

> The probably intended behaviour would be:
> At tunnel start and at any re-connect the IP is resolved.
> 
> Do you agree that this behaviour should be changed?
> Apart from that: Can you suggest an automatable workaround?

In some circumstances a similar behavior would be a desired.

Wireguard design and implementation is layered (which seems good).
The secure* tunnel, including the kernel module and wg tool seem
to be in a reasonable state, but automation, DNS, key exchange are
out of scope for them. It is meant to be provided by tooling, which is
currently very raw.

As a workaround you could
  - unconditionally periodically update the endpoint
  - monitor last handshake time, when large update endpoint or restart
    tunnel
  - add keepalive to server - it might reduce your downtime

Regards,
Ivan Labáth
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  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-21 19:13 Hendrik Friedel
     [not found] ` <CANH_QeYQ7hyBG1qK9PJB9E77gggW0NYe70vv8m6Dn=fU5zHQbg@mail.gmail.com>
2019-08-25 18:44   ` Re[2]: " Hendrik Friedel
2019-08-26 18:02     ` Ivan Labáth
2019-08-28  6:06       ` Re[2]: " Hendrik Friedel
2019-08-28  6:17       ` Laszlo KERTESZ
2019-08-28  6:25         ` Re[2]: " Hendrik Friedel
2019-08-28  6:37           ` Laszlo KERTESZ
2019-08-28  6:54           ` Ivan Labáth [this message]
2019-08-28  7:43             ` Laszlo KERTESZ
2019-09-07 10:04             ` Re[2]: " Hendrik Friedel
2019-09-10  9:19               ` Ivan Labáth
2019-09-11 13:28                 ` Vincent Wiemann
2019-10-17 19:03                 ` Re[2]: " Hendrik Friedel
2019-10-20 20:25                   ` Ivan Labáth

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