SQUID2.7 width mark HIT + FreeBSD

[mohsen moradgholi moghaddam]

hello,

first i very thanks for you because read my mail...

i install squid 2.7 on FreeBSD 8.2 (width GENERIC kernel + PF + Bridge) and mark hit object with squid zph_mode , like this:

zph_mode tos
zph_local 0x30
zph_parent 0x0
zph_option 136

but when i run : tcpdump -nvi em1 port 80 | gerp 'tos 0x0'
squid never mark any packets , it amazing me...!

fore help me , far before i thank you...