In article <E17hMXs-00054n-00@sites.inka.de> you wrote: > on my 2.5.19 system some ICMP Port Unreachables get marked as unclean: this is 2.4.19 not 2.5. :) the ntp message is send by 2.4.19 through a freebsd router which is doing nat and pppoe in user mode to an old linux system (via multiple hops) and back. So it might be a masquerading problem, I will provide tcpdumps on both sides. The packets are perfectly reproduceable. Greetings Bernd - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html