nanog mailing list archives
Re: ISP customer assignments
From: Mark Andrews <marka () isc org>
Date: Wed, 21 Oct 2009 10:51:52 +1100
In message <18a5e7cb0910201638j7a24a10dwb8440a42f8f9c49e () mail gmail com>, Bill Stewart writes:
On Mon, Oct 19, 2009 at 7:07 PM, Nathan Ward <nanog () daork net> wrote:On 20/10/2009, at 3:02 PM, Bill Stewart wrote:plus want the ability to take their address space with them when they change ISPs (because there are too many devices and applications that insist on having hard-coded IP addresses instead of using DNS, and because DNS tends to get cached more often than you'd sometimes like.That's why we have Unique Local Addresses.This is the opposite problem - ULAs are for internal devices, and what businesses often want is globally routable non-provider-owned public addresses. If you've got a VPN tunnel device, too often the remote end will want to contact you at some numerical IPv4 address and isn't smart enough to query DNS to get it.
Which just means we should be fixing the VPN box.
And even though most enterprises these days only use registered addresses outside the firewall and not inside the firewall, it's still a pain to have to renumber everything and wait for everybody's DNS caches to expire, so if you're using Provider-independent IP addresses, it's much easier to tell your ISP "Sorry, ISP A, I've got a better price from ISP B and I'll move all my stuff if you don't beat their price." (Of course, customers like that are often telling ISP B "You'll have to be X% cheaper/faster/somethinger than ISP A or I'll just stay where I am" and telling ISP C "My main choices are ISP A and ISP B but I'd take a lowball quote very seriously...")
Renumbering in IPv6 is not the same as renumbering in IPv4. IPv6 is designed to support multiple prefixes on the one interface. There is actually enough address space to support doing this and allow renumber events to take weeks or months if needed. There is no need to say at XX:XX on DD/MM/YYYY we will be switching prefixes. One can be much smarter about how you do it. You can just introduce the new prefix. Add second address to the DNS. Do your manual fixes. Remove the old addresses from the DNS. Stop using the old prefix when you are satisfied that there is no traffic over them.
-- ---- Thanks; Bill Note that this isn't my regular email account - It's still experimental so far. And Google probably logs and indexes everything you send it.
-- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka () isc org
Current thread:
- Re: ISP customer assignments, (continued)
- Re: ISP customer assignments Tore Anderson (Oct 16)
- RE: ISP customer assignments Wouter de Jong (Oct 14)
- Re: ISP customer assignments Joel Jaeggli (Oct 13)
- Re: ISP customer assignments Justin Shore (Oct 13)
- Re: ISP customer assignments Michael Dillon (Oct 13)
- Re: ISP customer assignments Bill Stewart (Oct 19)
- Re: ISP customer assignments Nathan Ward (Oct 19)
- Re: ISP customer assignments bmanning (Oct 19)
- Re: ISP customer assignments Nathan Ward (Oct 19)
- Re: ISP customer assignments Bill Stewart (Oct 20)
- Re: ISP customer assignments Mark Andrews (Oct 20)
- Re: ISP customer assignments Karl Auer (Oct 20)
- Re: ISP customer assignments Mark Andrews (Oct 20)
- Re: ISP customer assignments Roland Dobbins (Oct 20)
- Re: ISP customer assignments Mark Andrews (Oct 20)
- Re: ISP customer assignments Roland Dobbins (Oct 20)
- Message not available
- Re: ISP customer assignments Tim Chown (Oct 21)
- Re: ISP customer assignments Ricky Beam (Oct 21)
- Re: ISP customer assignments Mark Andrews (Oct 21)
- Re: ISP customer assignments Justin Shore (Oct 13)
- Re: ISP customer assignments Chris Hills (Oct 13)