Vadtec wrote:
...
protocol 6 match u32 0xff534d42 0xffffffff at nexthdr+23 flowid 2:50
...
Using nexthdr+ in as simple way as above won't work. U32 won't automatically
adjust for the proper offset, you have to do it manually with another u32
filter, using "link" option.
It's very well explained in
http://ace-host.stuart.id.au/russell/files/tc/doc/cls_u32.txt
As a side note - don't forget that you can simply mark the traffic in
iptables and then use fwmark instead of u32 (or with u32 match mark).
Other bits of not so easily to find documentation re. tc, in case you need
it later in other cases:
1) In source tarball, check doc subdirectory for info about extended action
syntax
2) a bit of info about basic classifiers:
http://marc.info/?l=lartc&m=117569441229800&w=2
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