Two Simple Hints for Dual Stack Servers by Geoff Huston

It seems that the imminent prospect of IPv4 address exhaustion has managed to generate a renewed interest in IPv6. A number of the conversations I have had lately have been about setting up dual stack servers, and there is a widespread concern that if you convert a server from single stack IPv4 to dual stack then some clients will have problems in accessing your site. The same concern has been voiced with converting a mail server from single stack to dual stack.

Here are two very simple hints may be of assistance to you.

  1. Drop the interface MTU of the server. 1280 is a prudent value.
  2. Run a local 6to4 interface on the server, and use it to route 2002::/16 for outbound packets.

That's all. If you are happy to go off and do just that then you've read as much as you need to. If you want to understand why these two additional adjustments are helpful, then read on at
http://www.potaroo.net/ispcol/2010-05/v6hints.html

Tags: DS, Dual, Geoff, Huston, Stack

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