[128770] in North American Network Operators' Group
Re: BCP38 exceptions for RFC1918 space
daemon@ATHENA.MIT.EDU (Marco Hogewoning)
Mon Aug 16 01:49:32 2010
From: Marco Hogewoning <marcoh@marcoh.net>
In-Reply-To: <m2k4nrlpkf.wl%randy@psg.com>
Date: Mon, 16 Aug 2010 07:49:15 +0200
To: Randy Bush <randy@psg.com>
Cc: nanog@merit.edu
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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?
>>=20
>> (One argument in favor of exceptions is that it makes PMTUD work if
>> transfer networks use private address space.)
>=20
> and this is a good thing? =20
>=20
> 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
