Problem in using TC Traffic Control

Hi
I am new to “tc” Traffic Control but not new to Linux. I am using
Fedora 9 with 2.6.23 kernel with new iproute2 package and preinstalled
“tc” in the fedora. I am using the following rules for the “tc”.


I am using the Linux Box as a router which is forwarding packets
already mark with required parameters such as ToS marking, so I think
I shouldn’t have to use the iptables mangling features.

The linux is accepting the kernel but the problem is that when I do
“tc filter show” or “tc class show” it is not showing any thing.

The packets I am forwarding is not affected by these rules.

I am using HTB, is there any issue in using this.


tc qdisc add dev eth1 root handle 1: htb default 20

tc class add dev eth1 parent 1: classid 1:1 htb rate 100mbit ceil
100mbit

tc class add dev eth1 parent 1:1 classid 1:10 htb rate 1mbit ceil
100mbit tc class add dev eth1 parent 1:1 classid 1:20 htb rate 99mbit
ceil 100mbit

tc filter add dev eth1 protocol ip parent 1:0 prio 1 u32 match ip tos
46 0xff flowid 1:10

Can any one guide me what I am doing wrong

Regards
Karim Asif

Asif wrote:

> The linux is accepting the kernel but the problem is that when I do
> “tc filter show” or “tc class show” it is not showing any thing.

Hmm I would have thought tc would have thrown an error if you used
those, but it doesn't.

Your rules work for me, to see them -

tc -s filter ls dev eth1
tc -s class ls dev eth1

> tc qdisc add dev eth1 root handle 1: htb default 20

Won't matter in this case, but arp will go to default.

>
> tc class add dev eth1 parent 1: classid 1:1 htb rate 100mbit ceil
> 100mbit

You need to back off from 100mbit if it's a 100mbit nic, try 95 to allow
for overheads.

If it's a gig nic you may get issues with tso (tcp segmentation offload)
causing super size packets. You can turn it off with ethtool -k.

> tc filter add dev eth1 protocol ip parent 1:0 prio 1 u32 match ip tos
> 46 0xff flowid 1:10

I've never used tos to mark, but if it doesn't work remember to check
for decimal vs hex problems.