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Re: How Not to Multihome
On Oct 8, 2007, at 5:55 PM, Justin M. Streiner wrote:
On Mon, 8 Oct 2007, Keegan.Holley@xxxxxxxxxxx wrote:
That is not at all guaranteed.
Some providers take a pretty dim view of seeing chunks of their address space show up in advertisements originating from someone who isn't one of their customers. It can make troubleshooting connectivity problems for that customer (from the provider's point of view) very painful, i.e. "Hey, this AS, who isn't one of our customers, is hijacking IP space assigned to one of our customers!" The provider could then contact your host's upstream (s) and ask them to drop said announcement under the impression they're stopping someone from doing something bad.
If you do you have permission from the owner of the block, you Should Not Announce it.
If the owner gives you permission and can't figure out why their block is originated by another ASN as well, they need help. (Yes, I realize the latter part of the last sentence is probably true for the majority of providers, but whatever.)
In either case, your hypothetical question should not hold.
Also, if some network out there aggregates prefixes in an aggessive/ odd manner, the disjoint announcement, and the reachability info it contains could be washed out of their routing tables, causing connectivity problems.
How is this different than if the customers gets their own ASN and announces a sub-block from one of the providers?
Or are you suggesting they should get PI space?
-- TTFN, patrick