SixXS::Sunset 2017-06-06

Ticket ID: SIXXS #4995617
Ticket Status: Remote Problem

PoP: decgn01 - NetCologne Gesellschaft fur Telekommunikation mbH (Cologne)

Connectivity Issues with IPv6 to German provider Strato
[de] Shadow Hawkins on Monday, 20 June 2011 15:24:23
I am experiencing connectivity issues to a particular provider "Strato" in Germany since they upgraded their WEB and POP services to IPv6 on the IPv6-day. I have tested two different SixXS tunnels (the one I am using at home and this one we have at work for testing) with the same connectivity results. The ping -6 to one of the affected webpages e.g. (2a01:238:20a:202:1090::144) works without problems but the page often (not always) does not deliver data back to the initial HTTP get request. TCP handshake passed ok before. The page (and the POP connection) work flawlessly with IPv4. Other IPv6 pages such as don't show similar issues. Even the main Strato site 2a01:238:20a:202:6660:0:198:33 is always working. Web pages like show no issues. The tunnel is continuously working fine. When using other tunnel mechanims (e.g. 6to4 over an AVM Fritzbox) the affected WEB pages and POP connections are reachable without problems. Strato claims they have tested with different IPv6 devices and canot find any problem. Here are the connection details for the tunnel at work: User: JAQ1-SIXXS Tunnel: T56305 POP: decgn01 We are using an Astaro Firewall that terminates and routes our network to the tunnel endpoint. The tunnel passes a NAT device to the Kabel Baden-Wrtemberg network. 1 <1 ms <1 ms <1 ms [] 2 4 ms * * iGateway [] 3 8 ms 8 ms 7 ms 4 9 ms 10 ms 8 ms HSI-KBW-078-042-040-041.hsi3.kabel-badenwuerttem [] 5 12 ms 12 ms 11 ms [78. 42.40.11] 6 11 ms 15 ms 16 ms [] 7 16 ms 16 ms 15 ms [] 8 16 ms 18 ms 15 ms [] 9 15 ms 15 ms 19 ms [] I have done a lot of testing and tracing but cannot find the problem here on my side. It looks as if packets are missing on the way bach from these servers when the connection runs though the SixXS tunnels. Thanks for helping. I would have traces in my end if required.
State change: remoteproblem Locked
[ch] Jeroen Massar SixXS Staff on Monday, 20 June 2011 15:28:52
Message is Locked
The state of this ticket has been changed to remoteproblem
Connectivity Issues with IPv6 to German provider Strato
[ch] Jeroen Massar SixXS Staff on Monday, 20 June 2011 15:32:04
Sounds like an MTU issue but could be anything else. You might want to check for ICMP filtering happening (tracepath6 is a useful tool for that on Linux), but you most likely end up using wireshark to determine this and contacting the remote side about this issue. Not much we can do about.
Connectivity Issues with IPv6 to German provider Strato
[de] Shadow Hawkins on Monday, 10 October 2011 11:52:42
I have the same problem as you. My Website is hostet on the same Server. I have reported to Strato and now it works. They fixed the problem. Those are my sentiments.

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