On the importance of MTU

So, I’m now finally natviely IPv6 enabled :) This led to an interesting debtate about my internet connection. In a nutshell my Drayetk Vigor 100 is broken, but apparently by design. The problem is this- for IPv4 goes through my NAT whose public IP has an MTU of 1492 so Path MTU Discovery works fine. However IPv6 does not need NAT and the PPPoE interface does not have a public IPv6 and nor do the internal clients use it even it there was one.
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