From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?B?QXJ0xatyYXMgxaBsYWp1cw==?= Date: Thu, 08 Jan 2004 20:01:28 +0000 Subject: Re: [LARTC] Random ping jumps Message-Id: <3FFDB718.7080303@h2o.pieva.net> List-Id: References: <3FFC7969.1040103@h2o.pieva.net> In-Reply-To: <3FFC7969.1040103@h2o.pieva.net> MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: quoted-printable To: lartc@vger.kernel.org R. Steve McKown wrote: > Can you provide some more detail on your network configuration? I'm uncl= ear=20 > if the linux server is your internet router or just another client comput= er=20 > on your local LAN It's network router. > , where the test pings to "the internet" are going (i.e.=20 > nexthop router, etc.), and if/where CIPE tunnels are involved in the=20 > equation. Perhaps a small network map would be helpful. No CIPE (whatever is that ;-). Nexthop? You mean gateway? eth0:1 Link encap:Ethernet HWaddr 00:50:22:B1:67:6D inet addr:81.7.84.36 Bcast:81.255.255.255 Mask:255.0.0.0 UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1 Interrupt:10 Base address:0xd000 gateway: 81.7.84.1 Map is at http://h2o.pieva.net/net.png > I'm also unclear about the pings that you've tried. After you've shown t= he=20 > network map, perhaps you can identify the two machines (and interfaces)=20 > involved in each of the different ping tests you've performed. The machine is totaly random. x11@rasnet:~$ traceroute fortas.ktu.lt traceroute to fortas.ktu.lt (193.219.160.131), 30 hops max, 38 byte packets 1 adsl-213-190-40-129.takas.lt (213.190.40.129) 26.269 ms 23.333 ms = 25.156 ms 2 fe22-acc0-tai.kns.telecom.lt (212.59.7.233) 63.079 ms 33.146 ms 26= .117 ms 3 telecom-gw.is.lt (193.219.13.99) 35.978 ms 26.476 ms 103.138 ms 4 litnet-gw.is.lt (193.219.13.98) 22.715 ms 24.531 ms 209.984 ms 5 cat6506-p2-1.kttc.litnet.lt (193.219.62.125) 52.826 ms 98.040 ms 8= 1.609 ms 6 ktu-lan.litnet.lt (193.219.61.252) 38.696 ms 182.582 ms 241.836 ms 7 fortas.ktu.lt (193.219.160.131) 215.523 ms 126.815 ms 29.217 ms x11@rasnet:~$ traceroute cs.mes.lt traceroute to cs.mes.lt (193.219.67.253), 30 hops max, 38 byte packets 1 adsl-213-190-40-129.takas.lt (213.190.40.129) 748.174 ms 66.331 ms = 135.586 ms 2 fe22-acc0-tai.kns.telecom.lt (212.59.7.233) 21.645 ms 21.588 ms 24= .597 ms 3 telecom-gw.is.lt (193.219.13.99) 30.584 ms 31.065 ms 29.612 ms 4 litnet-gw.is.lt (193.219.13.98) 24.602 ms 143.212 ms 143.096 ms 5 cat6506-p2-1.kttc.litnet.lt (193.219.62.125) 292.196 ms 163.870 ms = 84.549 ms 6 ktu-lan.litnet.lt (193.219.61.252) 84.982 ms 54.801 ms 69.143 ms 7 diz.ktu.lt (193.219.67.253) 33.831 ms 29.877 ms 30.005 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=3D5 ttlY time4.8 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=3D6 ttlY time2.6 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=3D7 ttlY time3.1 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=3D8 ttlY time24 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=3D9 ttlY time=836 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=10 ttlY time=850 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=11 ttlY time21 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=12 ttlY time=147 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=13 ttlY time=115 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=14 ttlY time=118 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=15 ttlY time=107 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=16 ttlY time=107 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=17 ttlY time'2 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=18 ttlY time12 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq=19 ttlY time=102 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq ttlY time=107 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq! ttlY time=114 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq" ttlY time=89.8 ms 64 bytes from diz.ktu.lt (193.219.67.253): icmp_seq# ttlY time=91.2 ms x11@rasnet:~$ traceroute cs.bbd.lt traceroute to cs.bbd.lt (193.219.184.7), 30 hops max, 38 byte packets 1 adsl-213-190-40-129.takas.lt (213.190.40.129) 23.803 ms 24.813 ms = 56.163 ms 2 fe22-acc0-tai.kns.telecom.lt (212.59.7.233) 171.425 ms 21.174 ms 2= 4.321 ms 3 telecom-gw.is.lt (193.219.13.99) 27.882 ms 30.782 ms 26.219 ms 4 litnet-gw.is.lt (193.219.13.98) 22.842 ms 23.025 ms 24.079 ms 5 cat6506-p2-1.kttc.litnet.lt (193.219.62.125) 24.201 ms 25.130 ms 2= 7.256 ms 6 ktu-lan.litnet.lt (193.219.61.252) 26.811 ms 27.362 ms 27.785 ms 7 193.219.184.7 (193.219.184.7) 27.928 ms 29.185 ms 28.067 ms x11@rasnet:~$ ping cs.bbd.lt PING cs.bbd.lt (193.219.184.7) 56(84) bytes of data. 64 bytes from 193.219.184.7: icmp_seq=3D1 ttl=123 time=133 ms 64 bytes from 193.219.184.7: icmp_seq=3D2 ttl=123 time=122 ms 64 bytes from 193.219.184.7: icmp_seq=3D3 ttl=123 time=118 ms 64 bytes from 193.219.184.7: icmp_seq=3D4 ttl=123 time=109 ms 64 bytes from 193.219.184.7: icmp_seq=3D5 ttl=123 timer5 ms 64 bytes from 193.219.184.7: icmp_seq=3D6 ttl=123 timef8 ms 64 bytes from 193.219.184.7: icmp_seq=3D7 ttl=123 time=120 ms 64 bytes from 193.219.184.7: icmp_seq=3D8 ttl=123 time=102 ms 64 bytes from 193.219.184.7: icmp_seq=3D9 ttl=123 time=91.5 ms 64 bytes from 193.219.184.7: icmp_seq=10 ttl=123 time=91.7 ms > I had a similar problem recently. Interestingly, it=20 > turned out to be bad hardware. Another person told me that bad hw could be reason. But it works for LAN perfectly. > Moved the boot media to an identically > configured machine and the problem went away. Returned the boot media to= the=20 > original machine and the problem returned. Sad, but i can't do that :( My /etc/network/interfaces: auto eth0 iface eth0 inet static address 192.168.0.1 netmask 255.255.255.0 autho eth0:1 iface eth0:1 inet static address 81.7.84.36 netmask 255.0.0.0 gateway 81.7.84.1 mtu 1492 I hadn't set mtu before. After setting it ping times decreased. (afterall i= t's dsl). Also, what exatcly net/ipv4/tcp_low_latency =3D 1 in sysctl do? --=20 Sincerely, Art=C5=ABras =C5=A0lajus ICQ: 157929934 Jabber: arturaz@akl.lt Oh, and please'o'please use UTF-8! :-) _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/