I am having issues with some IPv6 websites loading. Traced it down to and issue with packet size. PPPoE client automatically adds an IPv4 mangle rule to clamp MSS at 1440 but does not create an IPv6 mangle rule. Any ideas what the MSS should be set at on IPv6 with PPPoE? 1440 is to large yet. 1400 works. I am hoping someone has a number rather then having to do trial and error between 1400 and 1440.
IPv6 has PathMTU Discovery, Works without Andy Config,
But you Need to Not block ICMP in IPv6
Mistry7
IPv6 has PathMTU Discovery, Works without Andy Config,
But you Need to Not block ICMP in IPv6
Something is blocking it and its not my Mikrotik config on the PPPoE client, server or BGP gateway. I am guessing the Windows firewall. If its the Windows firewall its not practical to turn it off on every users PC. This seems to only be an issue on certain websites though.