From: Ming-Ching Tiew To: lartc@xxxxxxxxxxxxxxx Sent: Monday, February 05, 2007 9:28 AM Subject: tc filter matches ip fileds inside pppoe frames > I have a requirement which I guess it is not too unusually, however I haven't > quite figured out how to do it and couldn't find any examples which handle that. > > I have made myself a Linux-based bridge, eth0 bridged with > eth1 to form br0. > > In this bridge, I run 'tc' script to handle QoS. > > So far nothing unusual. > > However, what's different is that this bridge is sitted in between a pppoe client > and pppoe server, ie pppoe frames are bridge between the Linux bridge, and > I am interested to perform QoS on the pppoe frames, based on the ip tos setting > of the ppp packets ( encapsulated inside the pppoe frames ). > > For example, normal tc script :- > > tc filter add dev ppp0 parent 1:0 prio 10 u32 \ > match ip tos 0x10 0xff \ > flowid 1:4 > > This will work on a ppp0 device because the ppp0 has ip packets flowing through > it. Now in my bridge, there is no such device, I only have access to eth0 or eth1, > how could I perform the same thing on devices such as eth0 or eth1, but matching > the ip TOS setting inside the pppoe frame ? Perhaps this will be one step closer to matching ip TOS inside the PPPOE frame :- # tc filter add dev vlan0 parent 1:0 protocol 0x8864 prio 10 u32 \ match u32 0x00100000 0x00ff0000 at .... \ flowid 1:4 Protocol 0x8864 refers to PPP_SES. But the question where is the location of the TOS filed in the ip header encapsulated inside the PPP frame ? What if the IP header is compressed inside the ppp frame ? Cheers _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc