Hello everybody! Recently I’ve configured IPv6 Internet on RB951Ui with 6to4 public service. Good old IPv4 Internet goes over pptp tunnel of ISP. MTU of pptp is 1450, so I set 6to4’s MTU to 1420 (tried 1280 and it looks like it doesn’t change anything).
I’ve tested it with this service test-ipv6.com and it claims about MTU problem. With other mirrors only six of them say OK and others say about that problem.
Is this either my fault or just bugs of the service or the hole IPv6 Internet still has flaws? Can someone test it? Thanks.