Re: nmapping intermediate nodes
"Scott Weeks" <[email protected]>
| Newsgroups | gmane.org.operators.internet-access |
|---|---|
| Message-ID | <[email protected]> |
-------- [email protected] wrote: ------------ I've run into a strange problem. I have 2 systems that need to communicate with each other via email. System A has no problem talking to system B but System B cannot set up a connection with system A. So far I've sent mail from B to A via C but it's a major annoyance. I'd like to use B as an alternative MX for A but as long as they can't talk directly it's a pain. Here's the thing: I can do an nmap of B from A in about 5 seconds - perfect results. nmap from B to A just hangs. I can ssh between the two however. So my question is how can I find out who along the route is blocking me? ------------------------------------------------ You might try "tcptraceroute <ip address> 25". scott # tcptraceroute 1.1.1.1 25 Selected device xl0, address 2.2.2.2, port 58839 for outgoing packets Tracing the path to 72.235.208.254 on TCP port 25, 30 hops max <snip> _______________________________________________ "Eat sushi frequently". - Avi [email protected] is the human contact address. [email protected] is the list posting address. See below URL for subscribe/unsubscribe and list options: http://inet-access.net/mailman/listinfo/list