Dear Amos, thank you for replying; if I understand correctly from your reply; this can not be achieved by TOS. how about Marking and iptables, squid documentation refers to connmark, not mark. so, let's say if I mark the packet using iptables, on the INPUT, of the squid; will it retain it to the output; in which i can use another iptables rule to swap the mark back to TOS value; so that further network elements can process the DSCP tags. thank you for again. -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/tos-miss-mask-not-working-at-all-squid-3-5-5-tp4671815p4671851.html Sent from the Squid - Users mailing list archive at Nabble.com. _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users