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...Use protocol as hash key $TC filter add dev eth1 parent 1:0 prio 5 handle ::1 u32 ht 800:: \ match ip nofrag \ offset mask 0x0F00 shift 6 \ hashkey mask 0x00ff0000 at 8 \ link 1: Also, identical usage is shown in an example in Linux - Advanced Networking Overview: http://qos.ittc.ku.edu/howto/node48.html I could find no explanation of this usage in LARTC, and specifically, Section 12.4 on Hashing filters does not use it. Searches of the mailing list did not yield an answer. Review of tc code in f_u32.c showed that in parse_offset() the arguments were assembled into tc_u32_sel structure fiel...