In udp , there is no mss discovey.So , if we set DF bit in IP packet and suppose an intermediate router does have disabled icmp-reply (thru iptables ) and have less MTU than the sender. Then , router will drop the packet ,How client know to fragment the udp packet ? -Ratheesh -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html