Date: Wed, 17 Jan 2007 22:54:45 +0100 From: Michael Widerkrantz <mc@hack.org> To: freebsd-net@freebsd.org Subject: Re: Lenovo X60 em Message-ID: <86lkk1jp3u.fsf@tim.hack.org> References: <45ACF404.20700@ide.resurscentrum.se> <2a41acea0701160958m27c3537ctb25e5420e7a46891@mail.gmail.com> <45AD3C4E.1050608@ide.resurscentrum.se>
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Jon Otterholm <jon.otterholm@ide.resurscentrum.se> writes: > I think I found a pattern to work with. If I do a echo-reply wit the > "-D" (no fragment) and increase the packet size (-s) to 1472 I get > normal response times: I can verify that. I tried pinging the laptop from another machine (10.0.0.2) in my small home LAN. With large packets: tim# ping -D -s 1470 10.0.0.20 PING brain.internal.hack.org (10.0.0.20): 1470 data bytes 1478 bytes from 10.0.0.20: icmp_seq=0 ttl=64 time=1.278 ms 1478 bytes from 10.0.0.20: icmp_seq=1 ttl=64 time=1.321 ms 1478 bytes from 10.0.0.20: icmp_seq=2 ttl=64 time=1.235 ms 1478 bytes from 10.0.0.20: icmp_seq=3 ttl=64 time=1.178 ms 1478 bytes from 10.0.0.20: icmp_seq=4 ttl=64 time=1.096 ms 1478 bytes from 10.0.0.20: icmp_seq=5 ttl=64 time=1.499 ms 1478 bytes from 10.0.0.20: icmp_seq=6 ttl=64 time=1.451 ms 1478 bytes from 10.0.0.20: icmp_seq=7 ttl=64 time=1.363 ms 1478 bytes from 10.0.0.20: icmp_seq=8 ttl=64 time=1.280 ms ^C --- brain.internal.hack.org ping statistics --- 9 packets transmitted, 9 packets received, 0% packet loss round-trip min/avg/max/stddev = 1.096/1.300/1.499/0.119 ms With smaller packets: tim# ping -D -s 64 brain.internal PING brain.internal.hack.org (10.0.0.20): 64 data bytes 72 bytes from 10.0.0.20: icmp_seq=0 ttl=64 time=0.450 ms 72 bytes from 10.0.0.20: icmp_seq=1 ttl=64 time=53.031 ms 72 bytes from 10.0.0.20: icmp_seq=2 ttl=64 time=48.112 ms 72 bytes from 10.0.0.20: icmp_seq=3 ttl=64 time=43.394 ms 72 bytes from 10.0.0.20: icmp_seq=4 ttl=64 time=38.311 ms 72 bytes from 10.0.0.20: icmp_seq=5 ttl=64 time=33.252 ms 72 bytes from 10.0.0.20: icmp_seq=6 ttl=64 time=28.313 ms 72 bytes from 10.0.0.20: icmp_seq=7 ttl=64 time=23.204 ms 72 bytes from 10.0.0.20: icmp_seq=8 ttl=64 time=18.531 ms ^C --- brain.internal.hack.org ping statistics --- 9 packets transmitted, 9 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.450/31.844/53.031/15.422 ms Note what happens after the first packet. The other way, /from/ the laptop, seems fine, though: brain# ping -D -s 64 tim.internal PING tim.internal.hack.org (10.0.0.2): 64 data bytes 72 bytes from 10.0.0.2: icmp_seq=0 ttl=64 time=0.762 ms 72 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=0.565 ms 72 bytes from 10.0.0.2: icmp_seq=2 ttl=64 time=0.449 ms 72 bytes from 10.0.0.2: icmp_seq=3 ttl=64 time=0.359 ms ^C --- tim.internal.hack.org ping statistics --- 4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.359/0.534/0.762/0.151 ms
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