On Fri, 18 Nov 2016 11:58:58 -0800, Carl Byington said: > If you have IPv6 connectivity thru a tunnel, with a smaller MTU, that > will fail. With a 1500 byte MTU, it works. The TCP handshake works - it > then hangs during the TLS handshake which sends full size packets.
Did you do anything to specifically identify Yahoo's routers as the offenders? Hint: If there's a tunnel in the path, it will be *your* end of the tunnel that sends back the "can't frag" ICMP. So the filtering is happening somewhere between your end of the tunnel and you.
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