[LARTC] mark incoming traffic

Bgs bgs at bgs.hu
Mon Apr 2 15:21:22 CEST 2007


Never mind... got it... I will sit down myself :)

Bgs wrote:
> 
>  Greetings,
> 
> I'd like to mark incoming traffic based on TOS to use the mar for 
> backtraffic routing. I have two gateways on the same net and incoming 
> traffic may arrive from any of them. I want the return packets to go the 
> same way. My plan is:
> 
> Normal traffic goes through default gw. Traffic from the other has TOS 
> 0x08 set. I'd like to mark traffic with TOS and use fwmark awith iproute 
> for outbound packets.
> 
> My problem is that I can mark based on an incoming property and I need 
> the mark on the outbound packets. How can I do this?
> 
> Doing "-A INPUT -p tcp -m tos --tos 0x08 -j MARK --set-mark 1" (in 
> mangle of course) is not good as the mark is lost. Doing tests with "-A 
> OUTPUT -p tcp -d test_client_ip -j MARK --set-mark 1" works ok.
> 
> Is there a solution?
> 
> Thanks in advance
> Bgs
> 
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