On Wed, 9 May 2001, Brett Johnson wrote:
> Ok with 'Portable' IP address space it would be easy, but how about
> with Provider provided. If we changed the ISP that doesn't provide
> the space?
Usually they will let you announce for 30-90 days......just depends, to
help facilitate the move. Thats just courtesy but not a right.
Worst case you have to renumber.
What alot of ISP's will do, is renumber the core multihomed, and use
address translation outbound. So the servers have the old and new IP's
(or their is a translator doing the translation). This effectivly
blackholes the space if it were to be re-assigned, but sometimes its the
only practical reasoning.
For example, a 100,000 user ISP has 100,000 users with 100.100.100.1 as
their nameserver IP. So that company switches transit providers and
loses the provider IP space assigned to them. So they simply take
incoming requests from users to 100.100.100.1 and translate to the new
200.200.200.1 for example, and the customers know no better. You can do
this inside your network.
Brian
>
> -----Original Message-----
> From: Charles Manafa [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, May 09, 2001 11:01 AM
> To: [EMAIL PROTECTED]
> Subject: RE: Changing ISPs [7:3831]
>
>
> I assume you are going to obtain a Provider Independent IP Address space.
If
> so, you won't have too much difficulty changing ISP. In Europe, you have to
> update the RIPE database with your routing policy details.
>
> CM
>
> > -----Original Message-----
> > From: Brett Johnson [mailto:[EMAIL PROTECTED]]
> > Sent: 09 May 2001 16:37
> > To: [EMAIL PROTECTED]
> > Subject: Changing ISPs [7:3831]
> >
> >
> > If I acquire an AS number and use it with two providers what
> > happens if in a
> > year or two
> > I decided to change one of the providers. Do I have to inform ARIN or
> > acquire a new AS
> > number? What would be the process of informing the Internet
> > (through BGP)
> > when changing
> > the ISP? How about if I added a third ISP instead of changing ISPs?
> >
> > Thank you
> >
> > Brett Johnson
> > FAQ, list archives, and subscription info:
> > http://www.groupstudy.com/list/cisco.html
> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> FAQ, list archives, and subscription info:
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> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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>
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