question: listening ipv6 instead of ipv4?

[PhatHub]

When I try to start the Lora gateway bridge, the UDP listener ends up creating an ipv6 service instead of ipv4. I've tried to force it by editing backend.go (approx line 100) to have:

conn, err := net.ListenUDP("udp4", addr)

However, netstat -lun still shows it as listening only via udp6:

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
udp        0      0 127.0.0.1:323           0.0.0.0:*                          
udp        0      0 0.0.0.0:32683           0.0.0.0:*                          
udp        0      0 0.0.0.0:68              0.0.0.0:*                          
udp6       0      0 ::1:323                 :::*                               
udp6       0      0 :::38377                :::*                               
udp6       0      0 :::1700                 :::*   

Is that normal?

Edit: in my /etc/default/lora-gateway-bridge file I have "UDP_BIND=0.0.0.0:1700" specified.

[brocaar]

I have the same here, but all works fine with ipv4. This method is used to "resolve" the UDP address: https://golang.org/pkg/net/#ResolveUDPAddr.

[PhatHub]

Ok! Thanks, I just wanted to make sure!