BCP38 exceptions for RFC1918 space

Randy Bush randy at psg.com
Sun Aug 15 18:05:04 UTC 2010

> 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.


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