two client connections -> crash?

[M. Dietrich]

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.