-----Original Message----- From: Owen DeLong [mailto:owen@delong.com] Sent: Thursday, May 20, 2010 7:37 AM To: Net Cc: nanog@nanog.org Subject: Re: Partial Use Of one Regions IP Block in another
You state "Obv, the best approach...". I don't think so. I think the best approach is whatever allows you to make most efficient use of your address space. Usually this will be from a single RIR rather than a multiple RIR approach.
Owen
The one drawback to that would be people who attempt to do geographical based service provisioning. Say a company based in the US uses part of their block in Europe or APAC. When they do a DNS request for a service address from $GLOBAL_CONTENT_PROVIDER, they end up getting the US service address because the content provider believes the request is coming from the US resulting in poor performance. In other words, if a service relies on connection to other services that try to do geographical affinity, it could lead to a sub-optimal experience. It could also cause problems where the content is different (or possibly prohibited) depending on the geographical location of the requestor which some folks try to determine by source address (but which is actually quite idiotic, in my opinion, because as you see from this thread, an IP address in no way relates to where the person really is, it only relates to where the entity to whom it was issued is located). Been there and experienced issues like that before. It can even be bad when you are given an IP block that might have been used before by someone in another region. George