Re: BCP38 exceptions for RFC1918 space

[Marco Hogewoning <marcoh () marcoh net>]

On 15 aug 2010, at 20:05, Randy Bush wrote:

> > What's the current consensus on exempting private network space from
> > source address validation?  Is it recommended?  Discouraged?
> >
> > (One argument in favor of exceptions is that it makes PMTUD work if
> > transfer networks use private address space.)
>
> and this is a good thing?  
>
> rfc1918 packets are not supposed to reach the public internet.  once you
> start accommodating their doing so, the downward slope gets pretty steep
> and does not end in a nice place.


I cannot agree more with this. If you want PMTU use non-private space, there is enough really :) And saving a /24 by 
renumbering your core into RFC 1918 won't save you from the coming run out.

MarcoH