[WireGuard] Troubleshooting with WireGuard

[Jason A. Donenfeld]

On Wed, Jul 13, 2016 at 7:51 PM, Baptiste Jonglez
<baptiste at bitsofnetworks.org> wrote:
> will win.  If two peers have the exact same AllowedIPs entry, then I'm not
> sure what happens.

Fear not, WireGuard has no undefined behavior! The routing table
implementation does not allow for nodes to be duplicated like that.
Only one peer may be assigned to the same node (IP/CIDR). If you run
these commands:

# wg set wg0 peer ABCD allowed-ips 1.2.3.4/32
# wg set wg0 peer EFGH allowed-ips 1.2.3.4/32

Then afterward if you run:

# wg show wg0

You'll see that ABCD has an allowed-ips of "(none)" and EFGH has an
allowed-ips of "1.2.3.4/32". In other words, setting will "move" an
existing entry to the new peer.