I have added a filter in tc as follows:
tc filter add dev eth0 parent 1: protocol ip handle 6 fw flowid 1:6
This should be sending packets marked by iptables with '--set-mark 6' to class 1:6. The problem is, I can't figure out how to later delete this filter. Replacing 'add' with 'delete' doesn't work, I get a 'RTNETLINK answers: No such file or directory' error message. I've tried a number of other combinations to delete it, but none seem to work.
Thanks for any help.