Does anyone have reliable, stable TCP over IPv6 on their OVH VPS in the UK?
A situation that I have only just come across, it might be on VPSs outside the UK but I only have UK based ones to go by.
I have a VPS in OVH's UK London data center.
I have a VPS in another VPS provider's UK data center, BrightBox in this instance (but it's affecting other VPSs I have with other providers too and other UK ISPs).
When trying to connect from the BrightBox VPS to OVH VPS using http/https or SSH over IPv6 it's unreliable, sometimes it goes through instantly, sometimes there's a delay, sometimes it timeouts completely. If using IPv4 there are no issues.
On the OVH VPS I have IPv6 connectivity, I can ping6 google.com and can make TCP connections to various websites like google etc, apt will connect okay. If I try to connect to the BrightBox VPS over IPv6 then I get the timeouts, delayed connection, or sometimes it goes through instantly. Again using IPv4 there are no issues.
An mtr trace shows packet loss around the start (or end when reversing direction) of the OVH routers, only on IPv6, IPv4 shows none.
Using the OVH looking glass to traceroute to my OVH VPS, I don't see any packet loss on either IPv6 or IPv4.
Pings bewteen the VPSs always go through, they never slow down or timeout, it only seems to be TCP traffic that exhibits the problem.
I have no issues connecting other VPS to other VPS, e.g. BrightBox to Bytemark over IPv6, the common denominator are the OVH VPSs.
OVH support tell me they have no issues, it's my fault and I haven't configured my server correctly, even though the issue is present when the VPS is in rescue mode. I have several OVH VPSs and they all exhibit the problem. IPv6 is configured to their guide using the settings from the control panel.
So is it me or is anyone else experiencing the same?