Hmm this mail was not finished, sorry about that. I will include the link that fell-off, <https://forum.netgate.com/topic/152935/ipv6-pppoe-mss-incorrect> IPv6 PPPoE MSS incorrect | Netgate Forum
Any help or pointers are greatly appreciated! PS: I use IPFW as my firewall, if this has anything to do with it. I do have a "reassemble all in" rule at the top of my ruleset From: dri...@freebsd.org <dri...@freebsd.org> Sent: Friday, 16 September 2022 18:36 To: freebsd-net@freebsd.org Subject: PPPoE (mpd5) IPv6 issues Hi freebsd-net! After a lot of google and tinkering I have hit a brick wall trying to set-up my new ISP which uses PPPoE. I'm at the point where IPv4 works fine 100% for all websites. But from the moment I turn on IPv6 all sites that prefer IPv6 stop working, I have confirmed that routing table etc all look good. So I'm more suspicious to a MTU / MSS issue. Although I cant find that much info about it. I have tcpmss fix turned on in my mpd.conf There seems to be a few sites like google.com and youtube.com that keep working. I have googled thoroughly but I was unable to find a fix for my problem. The one close to my issue seems this issue from 2020:
