On 26 Feb 2014, at 17:51, Matt Grant
Know I am some small fry on the list, but your help would be appreciated.
The BCP you’re looking for is called RFC 1918. The devices you see numbered out of RFC 1918 address ranges require global network-level communication. If you need examples of what communication is reasonably required, you can cite RFC 792 (e.g. ICMP type 3 code 4, which is what is biting PMTUd, or ICMP type 11 code 0, which is what will bite traceroute). You could also just acknowledge that no number of RFC citations is going to change anybody’s mind, and resort to hacks like in-band MSS reduction to give your TCP segments a fighting chance of traversing the RFC 1918 wasteland without hitting an interface MTU limit. The reality is that ICMP is so over-filtered across the world that relying on correct operation with a depressed MTU is mainly just a game of whack-a-mole. The only way to win is not to play. Joe