This is not Go-specific, I hope I'm not breaking some unwritten rule by
replying.
> I just figured this out. I need to manually set the NIC to promiscuous
> mode.
> Now the question is, is there a way to set the NIC to promiscuous mode
> in code, like in pcap.openlive?
You want to call sysctl(SIOCGIFFLAGS), set the IFF_PROMISC flag in
ifr.ifr_flags, and pass the results back to sysctl(SIOCSIFFLAGS).
I guess one could also use rtnetlink, if one were so inclined.
If I were you, I'd cheat:
ifname := "eth0"
cmd := exec.Command("ip", "link", "set", "dev", ifname, "promisc", "on")
err := cmd.Run()
-- Juliusz
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