Re: Thoughts on increasing MTUs on the internet

Simon Leinen wrote:

* Current Path MTU Discovery doesn't work reliably.

Please, let's wait for these more robust PMTUD mechanisms to be universally deployed before trying to increase the Internet MTU.

I think this is the proper summary of where we are at: Trying to restore one of the original design goals of ipv4 -- reliable internetworking of different MTU sized networks. But the waiting game doesnt work, act local and think global.

* IP assumes a consistent MTU within a logical subnet.

This seems to be a pretty fundamental assumption, and Iljitsch's original mail suggests that we "fix" this.

This is an implementation detail, since local IP nodes have no conception of remote IP nodes subnet detals.