On Jun 25, 2014, at 5:35 PM, Alexander Neilson
* How many transit providers provide MTU above 1500 Bytes?
1500 is pretty much the most prevalent MTU size on the Internet these days, as packets ingress at operator edges and then egress them on the 'far side'. So, an MTU larger than 1500 isn't going to help you on the public Internet. It's mainly useful within internal data centers, and WAN-type connections between same.
* How do others handle EDNS?
Fragmentation of large EDNS0 responses (or anything else) is pretty much automagic, from an operational perspective (except when folks have done silly things like block ICMP type-3/code-4 or ICMPv6 type-2). So, this isn't really a concern when looking at the MTU size your upstream transit provider offers.
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Roland Dobbins