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
