Hello, I''m wondering which of these filters is the best method for filtering ACK packages to achieve lowest delay possible on a dsl-link. This one ist from the wondershaper from the lartc-site: /sbin/tc filter add dev $EXTIF parent 1:0 protocol ip prio 0 u32 \ match ip protocol 6 0xff \ match u8 0x05 0x0f at 0 \ match u16 0x0000 0xffc0 at 2 \ flowid 1:10 Thats a suggestion from the german computer magazine c''t: iptables -A POSTROUTING -t mangle -o $EXTIF -p tcp -m length --length :64 -j MARK --set-mark 10 tc filter add dev $EXTIF parent 1:0 prio 0 protocol ip handle 10 fw flowid 1:10 But why so difficult? Is there a reason against filtering ACKs like this? iptables -A POSTROUTING -t mangle -o $EXTIF -p tcp --tcp-flags ACK -j MARK --set-mark 10 tc filter add dev $EXTIF parent 1:0 prio 0 protocol ip handle 10 fw flowid 1:10 regards Stefan _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
Stefan Gold wrote:>Hello, > >I''m wondering which of these filters is the best method for filtering ACK >packages to achieve lowest delay possible on a dsl-link. > >I think this is an excellent start for most stuff: http://digriz.org.uk/jdg-qos-script/ The reason for all the frills is basically that some P2P protocols cheat and use ACK for actual transfer of data. So I *think* both your examples, just try to filter only ACK''s smaller than a certain size (128 bytes is a good size), larger ones should be left alone and assumed to be bulk data. Ed W _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
Am Sonntag 20 Juni 2004 15:22 schrieb Ed Wildgoose:> >I''m wondering which of these filters is the best method for filtering ACK > >packages to achieve lowest delay possible on a dsl-link. > > I think this is an excellent start for most stuff: > http://digriz.org.uk/jdg-qos-script/That helped a lot. Thank you! Stefan _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/