[73522] in North American Network Operators' Group
Re: BGP Homing Question
daemon@ATHENA.MIT.EDU (Joe Abley)
Fri Aug 27 09:00:09 2004
In-Reply-To: <BAY9-DAV284UeaCYPct00001424@hotmail.com>
Cc: <nanog@merit.edu>
From: Joe Abley <jabley@isc.org>
Date: Fri, 27 Aug 2004 08:58:53 -0400
To: "Rick Lowery" <fredricklowery@hotmail.com>
Errors-To: owner-nanog-outgoing@merit.edu
On 27 Aug 2004, at 08:13, Rick Lowery wrote:
> If someone owns their own /20=A0which they received from Arin back in=20=
> the day and they want to subnet and use part of it (/24)=A0in Europe.=20=
> Would their be any problems if the wanted to advertise the North=20
> American issued=A0space from a European AS?
There should be no technical problem due to the origins of the numbers.
There might be a problem with some operators filtering out the /24 if=20
it's allocated from a block with consistent /20 allocation boundaries.=20=
However, if it's an old allocation this is not necessarily going to be=20=
the case (and many people are not that enthusiastic about allocation=20
boundary filtering anyway).
If you poke around on www.arin.net you should find summaries by /8 for=20=
the longest allocation within each block. The paragraph above is only a=20=
concern if your specific /20 lives in a /8 where the longest allocation=20=
made by ARIN has a mask length less than 24 bits.
> I know=A0they would not be=A0good Internet citizen, but=A0if they =
needed to=20
> do this for a temp basis does anyone see an issue?
There's not much bad citizenry in what you are suggesting: the=20
assigning-RIR problem is a non-problem, and your two sites are still=20
only going to originate one prefix each (which they would presumably do=20=
even if you had a separate LIR assignment for the European node).
Joe=
