Help with TC

ShadowBlade72 · 05-17-2010, 03:04 AM

I've searched through the forums and found a few threads that kind of helped, but I'm still pretty lost when it comes to TC. I was wondering if anyone could help me out with what I'm trying to do and also break it down and explain what each part of the command does so that I can learn along the way.

What I'm trying to do is limit any connection from source port 6001 to 30KB/s.

I'm currently running a game server and it has no built in bandwidth limiting feature, which means if someone logs in and needs to download the map it destroys my bandwidth for the rest of the servers players. The game server is running on port 6001.

If someone could help me with this, it would be greatly appreciated.

SuperJediWombat! · 05-17-2010, 07:01 AM

Try this:

Code:

/sbin/tc qdisc add dev eth0 root handle 1:0 htb default 10
/sbin/tc class add dev eth0 parent 1:0 classid 1:10 htb rate 30kbps ceil 10kbps prio 0
/sbin/tc filter add dev eth0 parent 1:0 prio 0 protocol ip handle 10 fw flowid 1:10
/sbin/iptables -A OUTPUT -t mangle -p tcp --sport 6001 -j MARK --set-mark 10

Please let us know how it goes.

ShadowBlade72 · 05-17-2010, 08:00 AM

Quote:

Originally Posted by SuperJediWombat!

Try this:

Code:

/sbin/tc qdisc add dev eth0 root handle 1:0 htb default 10
/sbin/tc class add dev eth0 parent 1:0 classid 1:10 htb rate 30kbps ceil 10kbps prio 0
/sbin/tc filter add dev eth0 parent 1:0 prio 0 protocol ip handle 10 fw flowid 1:10
/sbin/iptables -A OUTPUT -t mangle -p tcp --sport 6001 -j MARK --set-mark 10

Please let us know how it goes.

Well it worked kind of. It limited all traffic to 10kbps though. I changed ceil 10kbps to ceil 30kbps and it limited all traffic to 30kbps.

I'm guessing it's because the "htb default 10" which tells it to send all unclassified traffic to class 10, which is the classid that is limiting it to 30kbps right?

Edit:
Okay, so I think I fixed my problem by just leaving out the default statement in the first command. Now it only applies the rule to port 6001. Thanks for your help! It seems to be working perfectly!

Could you explain to me what the third line does though. What exactly does the filter line do? Is it just telling it to search through traffic that has the mangle 10 put into the header and apply the rule with flowid 1:10 to it?

ShadowBlade72 · 05-17-2010, 03:32 PM

Quote:

Originally Posted by ShadowBlade72

Well it worked kind of. It limited all traffic to 10kbps though. I changed ceil 10kbps to ceil 30kbps and it limited all traffic to 30kbps.

I'm guessing it's because the "htb default 10" which tells it to send all unclassified traffic to class 10, which is the classid that is limiting it to 30kbps right?

Edit:
Okay, so I think I fixed my problem by just leaving out the default statement in the first command. Now it only applies the rule to port 6001. Thanks for your help! It seems to be working perfectly!

Could you explain to me what the third line does though. What exactly does the filter line do? Is it just telling it to search through traffic that has the mangle 10 put into the header and apply the rule with flowid 1:10 to it?

Another Edit: Okay, well it was limiting everyone to a max of 30kbps which made the server lag all to hell for anyone connected. I changed it to rate 30kbps and ceil of 4mbps. I'm hoping this will resolve the issue, but only time will tell.

If anyone could tell me if that is the issue? I want to limit each connection to 30kbps, but allow up to 4mbps (which is my upload max speed).

What I mean:
192.168.1.10:6001 --> 30kbps
192.168.1.11:6001 --> 30kbps
192.168.1.12:6001 --> 30kbps

etc. I just used private IP's as an example to try and show what I meant.

Edit:
Okay, I don't think it's working how I'm trying to get it to work. If anyone could look it over and help me out it would be appreciated.

SuperJediWombat! · 05-17-2010, 06:34 PM

Oh, sorry I misunderstood. Using the htb class above it will shape all traffic from port 6001. You need to look up tbf (token bucket filter) and use that instead, I think that tc-tbf is per connection.

If you have any success, please post the final rules.

ShadowBlade72 · 05-17-2010, 08:53 PM

Quote:

Originally Posted by SuperJediWombat!

Oh, sorry I misunderstood. Using the htb class above it will shape all traffic from port 6001. You need to look up tbf (token bucket filter) and use that instead, I think that tc-tbf is per connection.

If you have any success, please post the final rules.

Yeah I didn't really explain it well in my first post. I'll let you know if I figure anything out. Thanks for your help so far.

alexxxutz · 05-20-2010, 03:11 PM

Any solution? I am looking for that too...