Port scan test behind a NAT?

  • Thread starter Thread starter Kolin Tregaskes
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K

Kolin Tregaskes

Is there anyway I can test my ports for leaks if I am behind a firewall with
NAT turned on? I've used a online scans and get results telling me that I
have certain ports open, but I close them and rescan and it still tells me
the port(s) are open.

Any solutions?

Kol
 
Kolin Tregaskes said:
Is there anyway I can test my ports for leaks if I am behind a firewall with
NAT turned on? I've used a online scans and get results telling me that I
have certain ports open, but I close them and rescan and it still tells me
the port(s) are open.

Any solutions?

Kol
Click to expand...
Which on-line scanning service? PcFlank? Sygate? Which ports? 137, 138,139,
80?
 
Is there anyway I can test my ports for leaks if I am behind a firewall with
NAT turned on? I've used a online scans and get results telling me that I
have certain ports open, but I close them and rescan and it still tells me
the port(s) are open.

Any solutions?
Click to expand...
nMAP. You tell it the IP address of the computer, even if its the one
you're running the software on.
 
I've used grc.com, Norton's and PCFlank.

ICMP Ping and port 23 (telnet).

Kol
 
My IP for my computer is a local number, i.e. 192.168...

Will it still work?

Kol
 
Is there anyway I can test my ports for leaks if I am behind a firewall with
NAT turned on? I've used a online scans and get results telling me that I
have certain ports open, but I close them and rescan and it still tells me
the port(s) are open.
Click to expand...

Maybe you are seeing a cached version of the results?


Jim.
 
I've used grc.com, Norton's and PCFlank.

ICMP Ping and port 23 (telnet).
Click to expand...

Your NAT router is listening on those. Ping is harmless, but you should
check out the settings for remote administration through telnet. Also
make sure you set a decent admin password on the router. See it's manual
for details on how.
 
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