IPv6 no longer supports fragmenting on routers. That means if you don't want to ... | Hacker News

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		revelation on Nov 28, 2012 \| parent \| context \| favorite \| on: The EC2 firewall is broken IPv6 no longer supports fragmenting on routers. That means if you don't want to be stuck with the default minimum MTU of 1280 (which you really don't want to for low-latency applications) you need to support Path MTU Discovery, which in turn requires ICMP to go unhindered across a large number of different networks between you and the receiver.

aidenn0 on Nov 29, 2012 [–]

ipv6 enforces a minimum MTU of 1280? I've personally run into many VPNs with much smaller MTUs

danudey on Nov 29, 2012 | [–]

And so the networks involved in those VPNs need to support path MTU discovery, and they won't have any problems.

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