search_gateway() fails on dual-stack LAN

[sbstp]

search_gateway() fails on dual-stack LAN

[stevefan1999-personal]

I found some interesting fact surrounding multicast address maybe?

On Windows machine, if you started Wireshark/Npcap to capture packets, the interface metric actually favors Wireshark (because it needs to be high up enough to capture traffic of course) but for some reason Npcap didn't forward the multicast to the main interface, thus the packet never had a chance to go to my main router.

I've experience similar problem of you, and if anyone having the same issue and also on Windows, this might be a special case worth checking out.

I have to specifically listen on my local address that's listed on my main interface to get around with this. The brute force solution would be to find all possible interfaces, listen and send IGD request to all of them, and then randomly select any valid/ok result.

[danielstuart14]

I solved this issue using the "local_ip_address" crate and passing the local ip it resolves to the search_gateway function: