On Sun, 25 Jul 2004, Ville Herva wrote: > > May be a MTU blackhole in the path from the server to you. > > Sorry for my cluelessness here, but does that explain the oddness in the > tcpdump David S. Miller pointed out? At least the beginning of the trace. One or two of the packets (the first data packets) from the server to you have gone missing. > It seems a mere > > ifconfig eth0 <ip> netmask <nm> mtu 1458 up > > was enough to make the problem go away (instead of the default MTU=1500). This also adjusts the MSS but in a more intrusive manner. > It could just be that the must-fragment icmp packets do not get back to > my machine (the problem appeared few weeks ago when my ISP changed the > connection from lease physical cable to their own cable - but it could > of course be also be a misconfiguration on my side.) The problem is almost certainly in the other direction, must-fragment icmp packets in the direction from you to the server gets lost. This is what you can test most easily by playing with the MSS option, or in some limited cases by tuning the MTU. > I don't know if these explain the oddness in the tcpdump, though. It does not. Regards Henrik - : 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
