How to stop BT from porting my network?

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dr.kevin

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Another person on my network uses BT, and it portf*cks my modem, making it super [h]ard to connect to the internet with the browser. Lots of timeouts.

When I connect to a website, it needs to use all those local ports on my PC. But it seems the dude running BT hogs all those ports, and I can't load websites properly anymore.

Is there a way to reserve a range of say 2000 ports so that other non-BT users can surf the internet, or is there no way to stop the random port bombardment of incoming BT connections?
 
The problem isn't likely to be port numbers, but the number of connections. Have the person reduce the number of connections BT uses to 50, that should fix the problem.
 
You could also set up QoS and limit the speed, or just completely deny BT all together ;)
 
protias said:
Good suggestion, but do you even know what router he has? Would it be supported? We can only know when he posts his router information ;)
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if his router is not supported he should set fire to it and buy one that is.... I love that thing :D


besides. i just found DD-WRT and am trying to spread the word to any one who has not.. Im just DD-WRT happy today.
 
i've heard about dd wrt, but I only have a cheap linksys 11b wireless router.

The problem is that my dsl modem gets clogged up. The linksys is fine.

Based on the TCPView program, it seems all my local ports (1024-4999) are not able to respond to the websites to tell them to send more data to my pc, and timeout.

Could it be that when my pc is trying to send data OUT on tcp port 4000, there's bittorrent data coming IN on port 4000? Thus I can't send data out on that port?


My network setup is like:
BT user
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linksys 80211b
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8port switch ------dsl modem.
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my pc.
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have him limit his upload speed. thats whats killing you connection. get utorrent. i have utorrent only upload at 22k of my 38k upload sp my wife doesnt call me all day and say the internet is slow. :D
 
my linksys wrt54g needed to be rebooted about every 3 days using it with bittorrent downloading. It just would go dumb even with ddrt running in it. I had to make a smoothwall box and havent looked back.

does rebooting it help?
 
What have you done to verify the "linksys is fine?" -- In these kind of scenarios it is most commonly the flood of incoming connections which fill up the state table on your router (not your modem) and thus create a problem. If your modem is properly set up it will either be completely passive or set to PPoE pass-through mode and your router will handle the handshaking. If you are letting your modem do the NAT'ing then that is problem numero uno.

If you have an old box around the house, try loading IPCop, or any of the other freely available linux firewall distros out there, on it and give that a whirl.

Even still that's only part of the solution - the second part would be to have him limit his maximum connections and speed on both download and upload.
 
Or block all ports cept the ones you use. Or block his ports by MAC address. Or block his MAC address entirely.
 
Orinthical said:
What have you done to verify the "linksys is fine?" -- In these kind of scenarios it is most commonly the flood of incoming connections which fill up the state table on your router (not your modem) and thus create a problem. If your modem is properly set up it will either be completely passive or set to PPoE pass-through mode and your router will handle the handshaking. If you are letting your modem do the NAT'ing then that is problem numero uno.

If you have an old box around the house, try loading IPCop, or any of the other freely available linux firewall distros out there, on it and give that a whirl.

Even still that's only part of the solution - the second part would be to have him limit his maximum connections and speed on both download and upload.
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I have concluded that the linksys is fine because after i reboot the dsl modem, the internet magically works again for all pc's connected to the linksys router.... and the 8port switch

You mention modem NAT...... I think that's exactly what my modem is doing, otherwise I wouldn't be able to access the internet through the 8port plain ol' nonrouting switch in my diagram above.
BT must be flooding the translation table, causing other pc's to timeout?

It doesn't seem that disabling NAT on my modem will solve problems either.
Whereas now I'm rebooting the modem after extensive BT floods........ If I disable NAT and let the linksys do the NAT, I'll instead be rebooting the linksys after BT floods.
I'm always gonna be rebooting something, and I want to find a way so that I don't have to reboot anymore.

But rebooting is an inevitable part of the BT game aint it.....

I can't block his ass b/c he's family..... and you have to let him download porn, movies, and mp3s like everyone else in the world.
 
what bt client is being used.

My smoothwall hasnt been rebooted in 300 something days now and bt is always going on my network.
 
There are rougly 65000 available local ports, the fact that hes using a couple hundred is not a big deal.
 
dr.kevin said:
You mention modem NAT...... I think that's exactly what my modem is doing, otherwise I wouldn't be able to access the internet through the 8port plain ol' nonrouting switch in my diagram above. BT must be flooding the translation table, causing other pc's to timeout?
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Your router has a small state table, your modem has an even smaller one. When I tried out DSL here a few months ago the modem they provided me was the same way. What I ended up doing was disabling the automatic sign-on on the modem (so it doesn't automatically connect) and then set my router to use PPoE and filled in the blanks. When the router engaged the modem in a PPoE session it went into passthrough mode and disabled the built-in NAT functions, allowing my router to do its job.

Right now you're probably being double NAT'd and that's a terrible place to be. :) Clean this up and I pretty much guarantee you'll see a speed increase.

dr.kevin said:
It doesn't seem that disabling NAT on my modem will solve problems either. Whereas now I'm rebooting the modem after extensive BT floods........ If I disable NAT and let the linksys do the NAT, I'll instead be rebooting the linksys after BT floods. I'm always gonna be rebooting something, and I want to find a way so that I don't have to reboot anymore.

But rebooting is an inevitable part of the BT game aint it.....
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Well, you could try it for a period of time... but the only way around this in the long run is a combination of what I said above and getting a new router. If your linksys will support DD-WRT, take a look at it as it's an excellent firmware alternative that will increase the performance and size of your state table. If your current router won't support DD-WRT, look at some of the better off-the-shelf routers or build one for yourself using an old box, a few NIC's and a copy of IPCop. :)

I never had to reboot my DGL-4100 and I never have to reboot my IPCop box either. There are ways around the reboot burden, but in your case, it may require buying or building something.
 
All the DSL providers in my area require you have their POS modems with no options, and all have built in routers.

I had the same problem, and when BT ask you for forward a large range of ports, I only did 5. BT still worked, just not as fast, and then limited the upload.

Those 2 things combined fixed surfing issues on the rest of the network.
 
Just limited the number of connections in your torrent client...the number of connections are what is eating up your bandwidth/clogging routers/modems/etc.
 
My network doesn't lose speed. It's just the annoying timeouts after hours of BT bombardment.

I played around with the BT settings and lowered various connection settings like half open tcp connections and shit. I'll wait and see if this helps.


fireburster said:
what bt client is being used.

My smoothwall hasnt been rebooted in 300 something days now and bt is always going on my network.
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he's using bitcomet. It has many changeable settings.
 
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