nanog mailing list archives
Re: Using IPv6 with prefixes shorter than a /64 on a LAN
From: Fernando Gont <fernando () gont com ar>
Date: Thu, 27 Jan 2011 01:09:43 -0300
On 26/01/2011 06:14 a.m., Owen DeLong wrote:
That said. Any size prefix will likely work and is even permitted by the RFC. You do run the risk of encountering applications that assume a 64-bit prefix length, though. And you're often crippling the advantages of IPv6.Just curious: What are the advantages you're referring to?1. Sparse addressing
This comes at a cost, though.
2. SLAAC 3. RFC 4193 Privacy Addressing
Privacy Extensions "solve" (*) a privacy issue *introduced* by SLAAC embedding the MAC addresses in the IID. -- So, if anything, I deem this as a patch, rather than a feature. (*) there is some bibliography about the effectiveness of privacy addresses. Some have even argued that they are harmful.
4. Never have to worry about "growing" a subnet to hold new machines.
As in #1, this comes at a price.
5. Universal subnet size, no surprises, no operator confusion, no bitmath.
With quite a bit of experience with subnetting (from IPv4), I doubt this can be flagged as a benefit. Thanks, -- Fernando Gont e-mail: fernando () gont com ar || fgont () acm org PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1
Current thread:
- RE: Using IPv6 with prefixes shorter than a /64 on a LAN, (continued)
- RE: Using IPv6 with prefixes shorter than a /64 on a LAN George Bonser (Jan 30)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Fernando Gont (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Ray Soucy (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Fernando Gont (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Roland Dobbins (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Jimmy Hess (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Roland Dobbins (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Fernando Gont (Jan 25)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Owen DeLong (Jan 26)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Fernando Gont (Jan 26)