Tickets - T5247 - packet loss to first IPv6 hop :: SixXS

Ticket ID: SIXXS #2619173
Ticket Status: User

PoP: iedub01 - HEAnet (Dublin)

T5247 - packet loss to first IPv6 hop

Shadow Hawkins on Tuesday, 14 September 2010 14:11:50

Hello, I'm MV31-6BONE with dynamic tunnel over heanet. I seem to have an issue with routing over heanet. I do not know if it is my new modem or heanet itself, but i have a huge amount of packet loss: 50% -> 75%. ipv4 routing to the POP itself has no packetloss at all. my tunnel IP is: 2001:770:100:56::2 [root@queen torrents]# ping6 2001:770:100:56::1 PING 2001:770:100:56::1(2001:770:100:56::1) 56 data bytes 64 bytes from 2001:770:100:56::1: icmp_seq=1 ttl=64 time=30.2 ms 64 bytes from 2001:770:100:56::1: icmp_seq=15 ttl=64 time=29.6 ms 64 bytes from 2001:770:100:56::1: icmp_seq=18 ttl=64 time=29.9 ms 64 bytes from 2001:770:100:56::1: icmp_seq=19 ttl=64 time=30.4 ms 64 bytes from 2001:770:100:56::1: icmp_seq=20 ttl=64 time=29.7 ms 64 bytes from 2001:770:100:56::1: icmp_seq=21 ttl=64 time=29.2 ms 64 bytes from 2001:770:100:56::1: icmp_seq=25 ttl=64 time=29.6 ms 64 bytes from 2001:770:100:56::1: icmp_seq=30 ttl=64 time=30.7 ms 64 bytes from 2001:770:100:56::1: icmp_seq=31 ttl=64 time=29.9 ms 64 bytes from 2001:770:100:56::1: icmp_seq=35 ttl=64 time=29.6 ms 64 bytes from 2001:770:100:56::1: icmp_seq=36 ttl=64 time=30.4 ms ^C --- 2001:770:100:56::1 ping statistics --- 43 packets transmitted, 11 received, 74% packet loss, time 42097ms rtt min/avg/max/mdev = 29.228/29.968/30.713/0.466 ms since i noticed this AFTER i got a new ADSL modem, i'm not ruling out that that is the problem.

State change: user Locked

Jeroen Massar SixXS Staff

on Tuesday, 14 September 2010 14:26:48

The state of this ticket has been changed to user

T5247 - packet loss to first IPv6 hop

Jeroen Massar SixXS Staff

on Tuesday, 14 September 2010 14:27:47

since i noticed this AFTER i got a new ADSL modem, i'm not ruling out that

that is the problem.

Please investigate that first. Do also note that you are quite distant from the iedub01 PoP and it might be better for you to move to bebru01 which should have much lower latencies

T5247 - packet loss to first IPv6 hop

Shadow Hawkins on Tuesday, 14 September 2010 16:47:57

well, tbh: i would like to, but i have no idea how to debug the modem, i have no access to machines behind the modem, so i could see if the encapsulated packets are filtered out or not. which should be weird anyway, since it has ~50% packet loss. and since ipv4 has no packet loss at all, until the pop-point... tbh: i would need help from heanet to figure this problem out. unless you have an idea how i could find this out?

T5247 - packet loss to first IPv6 hop

Shadow Hawkins on Tuesday, 14 September 2010 16:53:25

i'm not sure, it's needed, 30ms seems to be acceptable. and i'm not allowed to route my subnet through another tunnel, AFAIK.

T5247 - packet loss to first IPv6 hop

Shadow Hawkins on Wednesday, 15 September 2010 00:52:52

ok, disregard this issue; it seems disabling firewall on my modem does the trick, i guess it does some kind of weird connection limiting?

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