nanog mailing list archives
Re: ISP customer assignments
From: Adam Armstrong <lists () memetic org>
Date: Wed, 14 Oct 2009 00:11:06 +0100
eric clark wrote:
I'm sure there's an RFC somewhere talking about Classful addressing pre-CIDR. Perhaps we should stop using CIDR in IPv4. It might stop working one day. ;)So far, I have only dabbled with IPv6, but my reading of the RFCs is that VLSM for lengths beyond /64 is not required. Subsequently, to use anything longer is an enormous gamble in an enterprise environment. I envision upgrading code one day and finding that your /127 isn't supported any more and they forgot to mention it. I'll stick to /64, though it does seem a horrible waste of space. Someone else might have read the RFC differently though.
Operational reality helps to refine RFCs. Many people are already using longer prefixes for infrastructure and other purposes, so it's unlikely to go away. The only real issue is that some old hardware may not support prefixes longer than /64 in hardware and so may drop to software routing.
I don't know of any examples of this though. adam.
Current thread:
- Re: ISP customer assignments, (continued)
- 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)
- Re: ISP customer assignments Michael Dillon (Oct 13)
- Re: ISP customer assignments eric clark (Oct 13)
- Re: ISP customer assignments Adam Armstrong (Oct 13)
- Re: ISP customer assignments Scott Morris (Oct 13)
- Re: ISP customer assignments Ricky Beam (Oct 13)
- Re: ISP customer assignments Mark Andrews (Oct 13)
- RE: ISP customer assignments TJ (Oct 13)
- Re: ISP customer assignments Adrian Chadd (Oct 13)
- Re: ISP customer assignments Nathan Ward (Oct 13)
- Re: ISP customer assignments Mark Andrews (Oct 13)
- Re: ISP customer assignments Nathan Ward (Oct 14)
- Re: ISP customer assignments Mark Andrews (Oct 14)
- Re: ISP customer assignments Dan White (Oct 13)