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Ticket ID: SIXXS #5152589 Ticket Status: Remote Problem PoP: decgn01 - NetCologne Gesellschaft fur Telekommunikation mbH (Cologne)
Packet loss
![[nl]](/s/countries/nl.gif) Shadow Hawkins on Thursday, 07 July 2011 22:44:10
I am getting high IPv6 packet loss to my host. This is not constant, but rather has periods of nearly 0% loss and periods of 100% loss. I see this externally, and it is visible on the MRT graphs on SixXS as well. (Please ignore the 100% loss from today - the box was offline for a few hours for unrelated reasons.)
The tunnel is not using AICCU, but rather a static tunnel.
User ID: SK15964-RIPE
Tunnel ID: T67297
shane@h:~$ uname -a
Linux h.time-travellers.nl.eu.org 2.6.32-5-amd64 #1 SMP Tue Jun 14 09:42:28 UTC 2011 x86_64 GNU/Linux
shane@h:~$ cat /etc/debian_version
6.0.2
shane@h:~$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:16:3e:9f:43:b5
inet addr:78.47.15.240 Bcast:78.47.15.255 Mask:255.255.255.0
inet6 addr: fe80::216:3eff:fe9f:43b5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:57225 errors:0 dropped:0 overruns:0 frame:0
TX packets:4245 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4716339 (4.4 MiB) TX bytes:612443 (598.0 KiB)
Interrupt:9
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:1037 errors:0 dropped:0 overruns:0 frame:0
TX packets:1037 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:131875 (128.7 KiB) TX bytes:131875 (128.7 KiB)
sixxs Link encap:IPv6-in-IPv4
inet6 addr: 2001:4dd0:ff00:7ef::2/64 Scope:Global
inet6 addr: fe80::4e2f:ff0/64 Scope:Link
UP POINTOPOINT RUNNING NOARP MTU:1280 Metric:1
RX packets:2239 errors:0 dropped:0 overruns:0 frame:0
TX packets:2034 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:231011 (225.5 KiB) TX bytes:373198 (364.4 KiB)
shane@h:~$ ip route
78.47.15.0/24 dev eth0 proto kernel scope link src 78.47.15.240
default via 78.47.15.193 dev eth0
shane@h:~$ ip -f inet6 route
2001:4dd0:ff00:7ef::/64 via :: dev sixxs proto kernel metric 256 mtu 1280 advmss 1220 hoplimit 4294967295
fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 via :: dev sixxs proto kernel metric 256 mtu 1280 advmss 1220 hoplimit 4294967295
default via 2001:4dd0:ff00:7ef::1 dev sixxs metric 1024 mtu 1280 advmss 1220 hoplimit 4294967295
shane@h:~$ traceroute 78.35.24.124
traceroute to 78.35.24.124 (78.35.24.124), 30 hops max, 60 byte packets
1 static.78-47-15-193.clients.your-server.de (78.47.15.193) 0.040 ms 0.025 ms 0.016 ms
2 static.97.45.4.46.clients.your-server.de (46.4.45.97) 1.775 ms 1.949 ms 1.940 ms
3 213-239-224-225.clients.your-server.de (213.239.224.225) 0.137 ms 213-239-224-129.clients.your-server.de (213.239.224.129) 0.154 ms 213-239-224-225.clients.your-server.de (213.239.224.225) 0.152 ms
4 hos-bb1.juniper1.ffm.hetzner.de (213.239.240.224) 4.762 ms 4.774 ms hos-bb1.juniper4.ffm.hetzner.de (213.239.240.230) 4.911 ms
5 rtdecix-g00.netcologne.de (80.81.192.212) 5.336 ms 5.845 ms 5.830 ms
6 core-sto2-t71.netcologne.de (89.1.16.5) 8.945 ms 8.823 ms 8.329 ms
7 core-eup2-t32.netcologne.de (87.79.17.29) 8.293 ms 8.586 ms 8.574 ms
8 * * *
9 * * *
10 * * *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
shane@h:~$ ping 78.35.24.124
PING 78.35.24.124 (78.35.24.124) 56(84) bytes of data.
64 bytes from 78.35.24.124: icmp_req=1 ttl=57 time=8.65 ms
64 bytes from 78.35.24.124: icmp_req=2 ttl=57 time=8.44 ms
^C
--- 78.35.24.124 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 8.444/8.550/8.657/0.141 ms
shane@h:~$ traceroute6 2001:4dd0:ff00:7ef::1
traceroute to 2001:4dd0:ff00:7ef::1 (2001:4dd0:ff00:7ef::1), 30 hops max, 80 byte packets
1 gw-2032.cgn-01.de.sixxs.net (2001:4dd0:ff00:7ef::1) 8.867 ms 8.843 ms 8.828 ms
2 gw-2032.cgn-01.de.sixxs.net (2001:4dd0:ff00:7ef::1) 8.814 ms 8.795 ms 8.818 ms
I've not included tcpdump information, as I'm not exactly sure what to capture in this particular case.
If it helps, I can start a background "ping" and/or "ping6" running and capture the output over a couple of days.
State change: user
The state of this ticket has been changed to user
Packet loss
If it helps, I can start a background "ping" and/or "ping6" running and capture the output over a couple of days.
Mtr would be a better idea, though if there is something that is dropping proto-41 that would not become visible, but maybe it shows at least from your side where the packets start getting dropped.
What is strange is that your IPv4 traceroute does not finish, the way back works though:
traceroute to 78.47.15.240 (78.47.15.240), 30 hops max, 60 byte packets
1 78.35.24.121 (78.35.24.121) 0.274 ms 0.349 ms 0.388 ms
2 core-sto2-t32.netcologne.de (87.79.17.26) 0.334 ms 0.373 ms 0.407 ms
3 rtdecix-t43.netcologne.de (89.1.16.2) 3.394 ms rtdecix-t22.netcologne.de (89.1.16.6) 3.682 ms rtdecix-t43.netcologne.de (89.1.16.2) 3.523 ms
4 decix2-gw.hetzner.de (80.81.193.164) 4.111 ms 4.109 ms 4.102 ms
5 hos-bb1.juniper1.fs.hetzner.de (213.239.240.242) 8.580 ms hos-bb1.juniper2.rz14.hetzner.de (213.239.240.247) 8.017 ms hos-bb1.juniper1.fs.hetzner.de (213.239.240.242) 8.552 ms
6 hos-tr4.ex3k3.rz14.hetzner.de (213.239.224.228) 9.142 ms hos-tr1.ex3k3.rz14.hetzner.de (213.239.224.132) 8.908 ms 9.260 ms
7 static.181.68.4.46.clients.your-server.de (46.4.68.181) 8.309 ms 8.286 ms 8.628 ms
8 static.78-47-15-240.clients.your-server.de (78.47.15.240) 8.827 ms 8.822 ms 8.804 ms
Packet loss
Shadow Hawkins on Tuesday, 12 July 2011 08:59:22
Okay, please close this ticket.
It turns out that there is severe IPv4 packet loss on this host! Apologies for the noise.
State change: remoteproblem
The state of this ticket has been changed to remoteproblem
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![[ch]](/s/countries/ch.gif)
on Friday, 08 July 2011 12:36:39
Posting is only allowed when you are