AW: two client connections -> crash?

[Joachim Lindenberg]

Good observation. I never really understood  what IPs I should put there and also didn´t find a good  documentation on that. And obviously with one connection it wasn´t that important to get it right. What IP addresses or network should AllowedIPs refer to? Client? Server? Tunnel?
Thanks, Joachim

-----Ursprüngliche Nachricht-----
Von: M. Dietrich <mdt at emdete.de> 
Gesendet: Tuesday, 14 July 2020 12:11
An: wireguard at lindenberg.one; 'WireGuard mailing list' <wireguard at lists.zx2c4.com>
Betreff: Re: two client connections -> crash?


Quotation from wireguard at lindenberg.one at Juli 13, 2020 20:53:
> I am trying to configure one client system (Ubuntu 18.04.4 LTS 
> (GNU/Linux 5.3.0-62-generic x86_64)) against two servers. The 
> configuration is very similar:
> 
> root at Mailcow:/home/joachim# cat /etc/wireguard/wg0-client.conf 
> [Interface] Address = 10.200.200.2/24 PrivateKey = *** DNS = 8.8.8.8 
> #10.200.200.1
> 
> [Peer]
> PublicKey = qn6CTz578gbrYpzYkvV2okoqkIFHKye+mRj4i/I8Sz8=
> Endpoint = fire.lindenberg.one:51820
> AllowedIPs = 0.0.0.0/0
> PersistentKeepalive = 21
> 
> root at Mailcow:/home/joachim# cat /etc/wireguard/wg1-client.conf 
> [Interface] Address = 10.200.201.2/24 PrivateKey = *** DNS = 8.8.8.8 
> #10.200.200.1
> 
> [Peer]
> PublicKey = QAJANxtuAvdT+HR3fP1I2DXq0Azl0T3jF5s+cW7foSA=
> Endpoint = nc.lindenberg.one:51820
> AllowedIPs = 0.0.0.0/0
> PersistentKeepalive = 21
> 
> Wg-quick up wg0-client ist at system startup. Now unfortunately when I 
> do wg-quick up wg1-client the network stack kind of crashes. The 
> command does not terminate, and connectivity on all interfaces is 
> broken.
> Is this a configuration issue? Should I change ports to be different? 
> Is there some other issue?

The ports are fine because the IPs are different. You use the same AllowedIPs for both. And they cover the whole network. 
This cannot work. What is the intention of that config?

> Do I have to define two interfaces or could I have just one with 
> multiple peers? But how could I then specify which tunnel to use?

Depends on what you want to achieve. Sure you can use multiple peers for one interface.