Hi there list,... I need to block all timestamp-request and timestamp-reply On eth0 (Inet facing fast ethernet segment on a multi homed Linux router) but not on eth1 (LAN facing range). Ive played with it a bit but cant get it to behave,.. I can selectively filter all other ICMP correctly. Its been 4weeks of playing and googling and im at my wits end! Plz help. Ciao ciao and many thanks Ross