Two renumbering questions

Dean Anderson dean at
Thu Apr 30 03:05:21 UTC 1998

At 9:58 PM -0400 4/29/98, John R Levine wrote:
>My ISP is changing upstreams for a variety of reasons around May 18th.
>1.  I have a /24 SWIPed to me,  The ARIN listing doesn't say
>it's non-portable, so can I take it with me?  And if I do, how likely is it
>that the new ISP's announcement will get installed in backbone routers
>rather than filtered for being too long?  It's right in the middle of the old
>upstream's block 205.238.192/18.

I have a similar issue with a /21 which should belong to me. It's in the
middle of UUnet's block. They have claimed they own it in private mail, but
neither of us have actually updated the contact record, which indicates my
predecessor owns it.  For now it's fine, since I like uunet, and probably
won't change that.

The real problem with portability seems to be getting the route advertised.
A /21 has a chance (I think), but a /24 probably is going to be tough.  My
guess is that you won't be able to get anyone to route it, and even if you
do, it might not be accepted globally.

>2.  Assuming I have to renumber, I have a whole bunch of virtual domains all
>DNS served from one server in the renumbered space called
>(There's other servers elsewhere that won't get renumbered.) If I tell the
>Internic that ivan's host number has changed, will that update all the
>domains served from it?

Yes. Thats the beauty of Host records. Your domains have a host handle.
When you update the IP associated with that handle, all the domains that
use that handle are also updated.

To make this go smoothly, you will need a secondary nameserver in your
whois records that won't change, so you will still have service during the


           Plain Aviation, Inc                  dean at
           We Make IT Fly!                (617)242-3091 x246

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