[Asterisk-Users] Re: 911 and lawsuits and redundancy

[Rich Adamson]

> On Wednesday 07 January 2004 10:53, Steven Critchfield wrote:
> > Interestingly enough, when I nmap my primary 2 asterisk boxes I
> > don't even see the IAX ports. Need to think about getting nmap
> > patched for the VoIP ports.
> 
> Note that IAX and IAX2 are both UDP.
> 
> > Anyways, I only have ssh, smtp(outgoing
> > only), auth, and postgres showing up.
> 
> Note that these are all TCP.
> 
> nmap can't reliably detect UDP ports, unless a service returns a
> packet.  Remember, UDP is a connectionless protocol.  Given that the
> probes to IAX and IAX2 were probably malformed for those protocols
> (unless nmap has been made IAX-aware), I doubt you'll get any
> response, ever (and therefore, never detected by nmap).

Just ran an nmap (-sU) and got:
Interesting ports on <asterisk>
Port       State       Service              
<snip>
4569/udp   open        unknown                 
5060/udp   open        unknown                 

which is exactly as expected (since I unloaded the iax module).
nmap worked fine on the local wire. :)

Rich