From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Fri Aug 26 2005 - 00:21:27 GMT-3
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
This archive was generated by hypermail 2.1.4 : Sun Sep 04 2005 - 17:01:20 GMT-3