I've written a program that is suppose to implement SLP (rfc2608) and I'm having trouble testing it. I'm not sure if the port is closed or there is something out there dropping my multicast datagrams. Is there a command I can run from a redhat terminal to tell me if a port is open on that box?
I've seen some posts on simply telneting to the port, etc..., but that only works for TCP ports, right? I've also read that there are sites that can test this sort of thing from the outside. But I really don't want to do that since I'm not interested in a full port scan, the box is on a private network, and even if it wasn't, I don't want it to look like a security incident is going on. I simply want to query and see if port 427 is open.