Re: 6to4/SIT and IP DF

[David Stevens <dlstevens@xxxxxxxxxx>]

That doesn't sound terrible, but won't it have to drop a minimum of
2 packets per tunnel on an MTU change (or initial probe with a large
packet)?

So, it wouldn't be a good idea to connect multiple v6 clouds in series,
with
6to4 tunnels between them and decreasing MTU's and then try to send a
large packet from one end to the other; you might run out of retransmits
before
you get to the other end. :-)

But using v4 PMTU info is probably almost always better than fragmenting
everything. A "fragment, but tell me about it" ICMP message would come in
handy here. And a requirement that ICMPv4 with tunnels include encapsulated
headers +8.

Thanks, Dave,
                  +-DLS