Re: Packets Redirection

Linux Advanced Routing and Traffic Control

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On Thu, 24 Oct 2002, Tom wrote:

> tc filter add dev $DEV parent 1:0 prio 0 protocol ip handle 20 fw flowid 1:20
> tc filter add dev $DEV parent 1:0 prio 0 protocol ip handle 21 fw flowid 1:21
> tc filter add dev $DEV parent 1:0 prio 0 protocol ip handle 22 fw flowid 1:22

This odd. With my setup (2.4.20pre10 and tc from the 3.6 tarball) I need
to specify classid instead of flowid:

# tc filter add fw help
Usage: ... fw [ classid CLASSID ] [ police POLICE_SPEC ]
       POLICE_SPEC := ... look at TBF
       CLASSID := X:Y

> iptables -t mangle -N MYSHAPER-OUT
> iptables -t mangle -I POSTROUTING -o $DEV -j MYSHAPER-OUT

Tried OUTPUT chain for locally generated packets?

> I transfered a file by ftp. The packets was sent through the class 22 and
> its bandwith limited to 88kbits, which is normal.

Yes if normal == default.

> But i sent pings and thoose packets were sent through the class 22 too
> which is not normal due to the mangle packets marking. I know which
> class was used by looking the tc classes status. Why icmp packets was
> not sent through class 20 ?

To see which chain you're required to use, append your MYSHAPER-OUT chain
to all default chains in the mangle table and see if it works.
Then have a look at the packet counts and remove the unused.

Walter

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