gopacket

I think this package does exactly what you need: https://pkg.go.dev/github.com/google/gopacket/routing. Works on my machine (error handling left to the reader) router, _ := routing.New() iface, _, _, _ := router.Route(net.ParseIP("8.8.8.8")) fmt.Println(iface.Name) this prints my Ethernet interface as expected. It doesn't make any requests, it just figures out where to route a packet. I guess it interfaces with the OS routing table.

This looks interesting, but I find it hard to follow when half of the magic happens in some library I've never seen before. Would love to see something like this in plain code. "github.com/chifflier/nfqueue-go/nfqueue" "github.com/sergi/go-diff/diffmatchpatch" "github.com/google/gopacket" "github.com/google/gopacket/layers"

One thing I noticed while using your code as a reference for a project I worked on several weeks ago is that it doesn't record the state before following the pointer, so unless the pointer you follow eventually leads to another pointer that brings it back to where you were, you can't simulate recursion. I'm referring to lines 1286-1288 in codec.c, FWIW. Obviously, you only need to support jumping back per RFC1035 and your code supports both jumping back AND forward, so I'm just telling you this for idle chitchat and so that you know that your code was helpful and I appreciate you putting it out there. Thanks! Edit: Also, before I forget, this implementation uses recursion even though it's not necessary. https://github.com/google/gopacket/blob/3eaba08943250fd21252... Between your code, the one linked to above, and djbdns I was totally conf

Neat! In case anyone wants to use this on router7, where CGO_ENABLED=0, you’d need something like https://github.com/google/gopacket/pull/470

Very nice introduction tutorial with many examples. I am sure it will be a reference guide for many people —me included. Thanks! A minor issue, on your second snippet (open devices for live capture), you miss the "github.com/google/gopacket" import.