Broadcast UPnP over WireGuard

Question

I have few devices: VDS, custom NAS on linux, laptop PC. All of that successfully connected to one local subnetwork 10.1.1.0/24

Server configuration:

[Interface]
Address = 10.1.1.1/24
ListenPort = 5182
PrivateKey = ***

[Peer]
PublicKey = ***
AllowedIPs = 10.1.1.2/32

[Peer]
PublicKey = ***
AllowedIPs = 10.1.1.12/32

Typical client:

[Interface]
Address = 10.1.1.2/32
PrivateKey = ***

[Peer]
PublicKey = ***
AllowedIPs = 10.1.1.0/24,224.0.0.0/4
Endpoint = host.name:5182

A client interface (server is same)

wg0: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1420 qdisc noqueue state UNKNOWN group default qlen 1000
    link/none
    inet 10.1.1.2/24 scope global hub0
       valid_lft forever preferred_lft forever

Server listen any address and port

UNCONN 0      0                         239.255.255.250:1900       0.0.0.0:*     users:((minidlnad,pid=456,fd=5))

DLNA server can't be discovered, when I used OpenVPN this worked perfectly.

So, I tried send a broadcast with socat and not receive it on other side, except my real local network.

Answer 1

You use the point-to-point device, that doesn't support the broadcast and multicast. Also check the routing table local with command ip route get <broadcast-ip>. Likely, you will see only single route, that points to the local network, not the wireguard interface.