[LARTC] problem with filters - packets 'slipping' through them when they shouldn't

Marcin Kałuża marcin_ml at sekretarka.no-ip.org
Tue May 3 13:58:54 CEST 2005


Hi!
I'm trying to shape my internet connection traffic using hsfc and I've 
encountered the following problem (may not be connected with hfsc).
on my lan interface I shape incoming traffic like this:

tc qdisc add root dev eth1  handle 1: hfsc default 1003
tc class add dev eth1 parent 1:0 classid 1:1003 hfsc ls rate 10kbit ul rate 
10kbit
tc class add dev eth1 parent 1: classid 1:1001 hfsc ls rate 70Mbit ul rate 
70Mbit

tc filter add dev eth1 parent 1: protocol ip prio 1 u32 \
               match ip src 192.168.0.1 \
               flowid 1:1001

tc class add dev eth1 parent 1: classid 1:1002 hfsc ls rate 1Mbit ul rate 
1Mbit
tc filter add dev eth1 parent 1: protocol ip prio 2 u32 \
               match ip dst 192.168.0.0/24 \
               flowid 1:1002

class 1001 recievs the traffic generated by the server
class 1002 gets incoming traffic from the internet 
class 1003 is the default

And that's where my problem is - 1003 shouldn't get any traffic since (as I 
think) the above filters should in total match everything and direct it to 
1001/2. But there are some packets that go to 1003 and if I delete it, most 
of the traffic dies (even ping 192.168.0.2 doesn't work - whats even more 
wierd, not immediately, but after a minute or so from installing new queue)

Can anybody help me? Am I missing something in the filters? I've tried doing 
the same with iptables and mark in the postrouting chain and with fw filters. 
The situation was strange as well - every packet got marked either for the 
first or the second class, and in spite of this 1003 got traffic anyway...

thanks for any hints
Martin


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