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Old 09-30-2004, 03:23 PM   #1
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Registered: Jul 2004
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Find Blocked Ports on Network

Right now I'm on a college dorm residential network and certain programs (such as IRC and p2p programs) do not work because their ports have been blocked. I *think* there is some sort of proxy server that separates the dorm network from the internet, I am probably wrong. Is there a way to scan the proxy server (assuming that's what it is) and find out what other ports they have blocked?

I called and asked them this very question, but they didn't tell me anything, and I'm just curious to see what other ports they blocked so I know. One thing I do not know is the IP address of the proxy server. How do I find that out?

I've been messing around with nmap a bit, but I really have no idea what I'm doing lol. Appreciate any help.
Old 09-30-2004, 03:56 PM   #2
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The "proxy" (which is quite likely to be a router
and/or firewall as well) will probably be what
gives you as the default gateway...

But you REALLY should make sure that network
scans aren't a punishable offense on your network,
if I were a sys-admin there and you scanned my
network I'd exclude your machine from ANY traffic
for some time ;)

Old 09-30-2004, 04:01 PM   #3
Registered: Jun 2003
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To find the proxy server, do
You will get something like
 1 (  12.203 ms  8.079 ms  8.273 ms
 2 (  10.090 ms  13.845 ms  9.076 ms
 3 (  10.357 ms  9.325 ms  10.227 ms
 4 (  12.345 ms  12.330 ms  11.018 ms
 5 (  29.359 ms  9.782 ms  10.186 ms
 6 (  31.984 ms  28.426 ms  28.032 ms
 7 (  30.539 ms  26.842 ms  28.063 ms
 8 (  29.325 ms  27.303 ms  28.138 ms
 9 (  34.604 ms  27.340 ms  27.978 ms
10 (  84.913 ms  82.347 ms  86.442 ms
11 (  92.306 ms  83.056 ms  82.458 ms
12 (  83.983 ms  83.460 ms  83.014 ms
13 (  87.979 ms  85.077 ms  84.645 ms
14 (  85.300 ms (  86.133 ms (  85.498 ms
15 (  85.835 ms (  85.422 ms (  86.624 ms
The last local address is the proxy

local addresses start with 10 or 192.
Good Luck



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