IPv6 packet drop caused by large MTU

This results in a rather miserable TLS (HTTPS) handshake failure in my case.. tcpdump shows a suspicious SACK packet when capturing packets through ppp0:

And packets for {1:5760} hadContinue reading

Two /64 IPv6 “blocks” are allocated to my router

At the first glance I was thinking it’s a bug in my router or it could be some obsolete data that has not been purged:

But it isn’t. TheContinue reading