From: Scott Morris (swm@emanon.com)
Date: Fri Aug 26 2005 - 00:25:40 GMT-3
No arguments from me. :)
And this is why we have 170,000'ish routes in the BGP table.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Howard C. Berkowitz
Sent: Thursday, August 25, 2005 11:21 PM
To: ccielab@groupstudy.com
Subject: RE: About ISP address announcement
At 8:26 PM -0400 8/25/05, Scott Morris wrote:
>If you're still only going through one AS number, then they're going to
>have an aggregate route above that anyway, and absorb your more
>specific announcement.
I didn't assume that 85.1.0.0/22 was a more-specific of ISP A's allocation.
It may well be, or it may be a separate, non-aggregated block that ISP A can
assign.
We probably don't have all the information here. To have gotten a registered
AS number, Woody's AS must have plans of multihoming. If they multihome to
ISP B, ISP B will certainly have to advertise 85.1.0.0/22.
For multihoming to work, however, if 85.1.0.0/22 is a more-specific of ISP
A's space, ISP A _must_ still advertise the more-specific as well as its
aggregate. Otherwise, all traffic to 85.1.0.0/22 would go through ISP B
because ISP B is advertising the most specific route.
>
>They just static'd to you. You'll just need to talk with them, but
>there's no technical reason things shouldn't be ok. On the other hand,
>they may take back the /22 if you have your own /21. I would anyway.
>:)
>
>Scott
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of ??
>Sent: Thursday, August 25, 2005 7:47 PM
>To: ccielab@groupstudy.com
>Subject: About ISP address announcement
>
>hi group:
>
>I have a question and need your help:
>
>we rent IP add 85.1.0.0/22 from ISPA before, and we used default route
>to upstream ISP A.
>but now, we applied public AS number and IP address 99.1.0.0/21
>ourself. we are going to BGP connect to Upstream ISP A. I am confused
>with the old IP address 85.1.0.0/22. This IP address block is blong to
>ISP A, if we use BGP connection, this IP address origin from our AS
>number, not from ISPA AS number.
>
>I think it will work fine, but i do not know if it is illegal.how to do
>with it.
>
>thanks.
>
>Woody
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