Finding individual port speeds

[FlyingPenguin128]

I was wondering if anyone knows of a program that can test the speeds of indiviual ports.
The reason I am wanting to do this is that here at school the campus IT people completely revamped the firewall over the summer. Now many ports that were open are now blocked and most ports that were completely open now have severe caps on them.
Bit torrent used to run very fast but now i can barely get over 5k/s download speed.

Also any ideas on why downloads from http servers start off at like 160k/s but then slowly decrease like 10k/s per minute until it reaches 40k/s. I realize that normal downloads like that start off quickly but then decrease but this seems to gradual for it to be normal.

 

[sulchus]

If you have physical access to the switches, there is a Console port on all managed switches. You can connect with a serial cable to a laptop or something and use HyperTerminal to check the settings on the switches. Then you could clear out all of the old VLAN info and bandwidth restrictions.

You can also connect remotely to any of the managed switches and do the same thing.

 

[big daddy fatsacks]

he doesn't mean that kind of ports i don't think. he means like "TCP port 80." i really haven't a clue how you'd check that.

 

[XOR != OR]

It's called throttling. The assumtion<sp> is, small downloads get all the pipe, but as it goes on longer, you are using more bandwidth, so it'll throttle the speeds back.

The best way to get the info you want is to ask the network admins. They, more than anybody else, should know what they throttled the ports to.

 

[UMCPWintermute]

Most likely, your network admins have a packet shaper (or other mystical QoS (Quality of Service) device) set up. What this does is allow certain types of packets (ie: TCP w/ dst or src port 80) have higher priority in the packet queue while limiting others (ie: BitTorrent/Kazaa) to slower speeds.

This is pretty much a necessary item at colleges, just because of the nature of college students to want to burn every last drop of campus bandwidth on P2P apps. Unfortunately, there isn't any way for you to get around this block, short of begging the network admins to exclude you from the QoS rulesets (not likely to happen).

It sucks, but I think you're out of luck.

 

[FlyingPenguin128]

not really what i wanted to hear... but what i expected

wintermute and everyone else thank you much... i guess i will just start trying random ports and see if i find one that i can get more bandwidth out of

 

[UMCPWintermute]

The more advanced QoS programs can examine the packets and determine the protocol based on more than the port they use, in which case you'll be mostly out of luck - but its worth a try.

 

[Phaedrus]

So basically you are asking "How do i get around the RULES the ADMINS set for my connection?" Im sure they wouldnt mind...
Sorry I cant finish this post.... I'm laughing too hard

 

[UnderLoK]

wintermute and everyone else thank you much... i guess i will just start trying random ports and see if i find one that i can get more bandwidth out of

"Most of the time" priority will be given to apps with realtime needs. You might want to try xfers on ports like 22,23,54,etc.. Another option could be the common gaming ports which might bypass the rules. 7777-7779 (ut) 14567 (bf) or alike.. You could also try game server query ports such as 23000 (gsp) or 14690 (ASE).

Your pretty much screwed though when it comes to BT as I don't think there is any way to specify a port for it to use...

 

[UMCPWintermute]

Your pretty much screwed though when it comes to BT as I don't think there is any way to specify a port for it to use...

Actually certain BT clients can do this - this one comes to mind. It depends on if the packet shaper examines the packet for protocol information, or just goes based off the port numbers.