port questions..

[Matthew Miller]

On Fri, Jul 07, 2006 at 01:22:56PM -0700, bruce wrote:
> i tried to run nmap from inside my network, pointing it to my external ip
> address..

Depending on how your network is set up, this may or may not be a useful
test.


> nmap foo.com -p113 for port #113
> i get
>  port     filtered     unknown/(known app)
> i assume this indicates that the port is open...

Why do you assume that? As suggested, check the man page, which for this
particular program is quite well written -- easy to read and helpful. An
excerpt:

   Filtered means that a firewall, filter, or other network obstacle is
   blocking the port so that Nmap cannot tell whether it is open or closed.

-- 
Matthew Miller           mattdm at mattdm.org          <http://mattdm.org/>
Boston University Linux      ------>              <http://linux.bu.edu/>