Utility to check for ports the firewall blocks or passes through

Utility to check for ports the firewall blocks or passes through
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Subject Author Date
Utility to check for ports the firewall blocks or passes through Alex 06-17-2006
Posted by Alex on June 17, 2006, 3:55 pm
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Hi

I have two subnets with a firewall in between. The firewall is managed by a
third party, but I need to independently check out if specific ports are
opened or not.

I imagine it should be done with a pair of programs running on each subnet
and trying to communicate through various ports.

Does someone know of such an utility?

Thanks in advance.

Alex

Posted by Sebastian Gottschalk on June 17, 2006, 4:00 pm
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Alex wrote:

> I imagine it should be done with a pair of programs running on each subnet
> and trying to communicate through various ports.
>
> Does someone know of such an utility?

Netcat.

Posted by John Mason Jr on June 17, 2006, 6:27 pm
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Alex wrote:
> Hi
>
> I have two subnets with a firewall in between. The firewall is managed by a
> third party, but I need to independently check out if specific ports are
> opened or not.
>
> I imagine it should be done with a pair of programs running on each subnet
> and trying to communicate through various ports.
>
> Does someone know of such an utility?
>
> Thanks in advance.
>
> Alex


Nemesis & ethereal


John

Posted by Alex on June 17, 2006, 7:37 pm
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Thanks Sebastian and John. I'll check Netcat first, seems simpler...

Alex

Posted by Volker Birk on June 18, 2006, 6:18 am
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> I have two subnets with a firewall in between. The firewall is managed by a
> third party, but I need to independently check out if specific ports are
> opened or not.

Just use a port scanner, i.e. nmap.

Yours,
VB.
--
"If you want to play with a piece of windows software that makes you
click all over the place, there's always minesweeper."

Kyle Stedman about "Personal Firewalls" in c.s.f

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