port 5060, was Re: [OT] router ports & DMZ

iceblink iceblink at seti.nl
Tue Feb 17 10:48:08 UTC 2015

On 2015-02-17 11:35, thufir wrote:
> On Tue, 17 Feb 2015 12:14:20 +0530, Jatin khatri wrote:
>> check you what is your live ip given by your ISP, and scan your live 
>> ip
>> from outside may be following[1] can help
>> [1] http://www.t1shopper.com/tools/port-scan/
> Oh, the double NAT is a red herring; sorry for bringing it up.  I just
> wanted to explain why I can't do certain tests.  If I didn't have a
> double NAT situation, that'd be great -- but I do.  For the purposes of
> this thread, no outside connectivity is actually required.
> I'm only interested, at this stage, in SIP to SIP within the network.
> Outside connective isn't a concern right now.
> two boxes:  tleilax and doge.  Tleilax is running Asterisk.
> The router always gives tleilax the same ip address; not sure that this
> really a "static" ip address -- but it's always the same, at least.
> Tleilax uses DHCP to acquire an IP adddress.
> All I want to do, or the hurdle, is for doge to connect to tleilax with 
> a
> softphone.  However, since the router blocks ports, that's not
> possible...right?
> thufir at doge:~$
> thufir at doge:~$ nmap -p 5060
> Starting Nmap 6.46 ( http://nmap.org ) at 2015-02-17 02:31 PST
> Nmap scan report for
> Host is up (0.00045s latency).
> 5060/tcp closed sip
> Nmap done: 1 IP address (1 host up) scanned in 0.04 seconds
> thufir at doge:~$
> so long as the router shows that port as closed, the connection will
> always be refused.  Right?

That depends on the way you have both boxes connected to the router.
The router only closes ports from WAN to LAN.
If both boxes are in the LAN, then the router won't block anything.

Best regards,

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