[ppml] ARIN Policy Proposal 2002-9

[Alec H. Peterson]

--On Wednesday, October 2, 2002 20:38 -0700 Mailing List 
<mailinglist at comentum.com> wrote:

> Can someone solve this mystery:
>
> If an organization is getting connections from two or more ISPs
> (Multihomed), the organization will receive am ASN and a /24 IP address
> from one of its ISPs, then, that organization and its ISPs will announce
> that /24 to the Internet.
>
> This will add an entry to the global routing table in the same way as if
> that organization received and announced its /24 IP space from ARIN.
>
> In the above situation (multihomed network), ARIN's argument of not
> assigning /24 for the reason of an increase in the global routing table
> does not make sense. Whether that organization received its /24 from one
> of its ISPs or from ARIN, in both cases the /24 will be announced and
> added to the global routing table.
>
> What is the excuse of ARIN not assigning /24 to multihomed networks?

That's an easy one.

If the customer decides to announce the /24, there is still a shorter 
aggregate that one of the providers is announcing.  A provider can then 
filter based on ARIN's allocation policy (/20 minimum) and still reach the 
customer.

Alec

--
Alec H. Peterson -- ahp at hilander.com
Chief Technology Officer
Catbird Networks, http://www.catbird.com