How Not to Multihome

Mon Oct 8 21:48:49 UTC 2007

--- Keegan.Holley at sungard.com wrote:

I have a client that wants us to advertise an IP block assigned by another 
ISP.  I know that the best practice is to have them request an AS number 
from ARIN and peer with us, etc.  However, I cannot find any information 
that states as law.  Does anyone know of a document or RFC that states 
this?
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There is no law.  ;)  Also, you can advertise the other provider's block given to your prospective customer as long as you work with that provider on how to do it.  However, if it's less than a /24 it won't get very far as most upstreams block prefixes longer than a /24.

scott