BCP38 exceptions for RFC1918 space
marcoh at marcoh.net
Mon Aug 16 05:49:15 UTC 2010
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.
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