nanog mailing list archives
Re: V6 still not supported
From: "Pascal Thubert \(pthubert\) via NANOG" <nanog () nanog org>
Date: Fri, 25 Mar 2022 20:39:53 +0000
Hello Phil The only far ressemblance with 6to4 is the thing that was actually nice in the design, the automatic word in automatic tunnel. Which for the rest of us means stateless. Compared to CGNATs that is huge. Beyond that the proposal is not a tunnel and more akin to a nat64 since it allows v6 nodes to talk to v4 nodes. The network can be pure v4 or pure v6 if the method is implemented as a bump in the stack at the wrong end. Your response is also missing the capability to extend the IPv4 network a million times. Or drop it completely while maintaining IPv4 applications. 6to4 was meant for early v6 to interconnect islands. A solution for a problem that never really existed. Solutions without a problem aren’t usually popular. Apparently here there’s a real world problem to be solved. Sophisms are of no help. Regards, Pascal
Le 25 mars 2022 à 19:40, Philip Homburg <pch-nanog-2 () u-1 phicoh com> a écrit : A host in the Internet that wants to talk to a host in China would require an update to parse new DNS double-A (realm, address) records to encapsulate the p acket IP-in-IP, outer src= 240.0.0.1 outer dest=240.0.0.2. The router that ser ves the shaft at level 1 attracts 240.0.0.0/8 within realm 1 and routes up the elevator for more specific (host) routes within that prefix. The router that serves the shaft at level 2 attracts 240.0.0.2/32 inside the shaft; upon the s aid packet it would swap the inner and outer destination and the packet would reach the Chinese address with classical routing within realm 2. Routers serving the shaft need an update, but then, only those do. Obviously t he host in China can only reply if its stack is updated to understand the form at. But all the other hosts and routers in China can be classical IPv4 as we k now them long as their traffic stays in China. To migrate to IPv6 what you can do is map the elevator shaft prefix in, say, 400::/3 (sadly cannot use F00/3 that would map 240 neatly but is already assigned). The current internet would own 400:1::/32, China would own 400:2::/32, etc... You encode the double-A of the host in the prefix, reserve a well known suffix for IPv4 mapped double-A, and you have an IPv6 address that can be mapped bot h ways statelessly. When migrating to v6, each IPv4 node that owns a public IP v4 address in one realm gets a full IPv6 /64 for free. "Somehow this sounds a lot like 6to4: packets get routed to special devices in the network and ISPs have little control over this. Not a popular architecture. Or another way to look at it is the resemblance with the ill fated 'Provider-Based Global Unicast Addresses' (RFC 1884, Section 2.4.7). This was not very popular either.
Current thread:
- Re: V6 still not supported, (continued)
- Re: V6 still not supported Joe Maimon (Mar 23)
- Re: V6 still not supported Greg Skinner via NANOG (Mar 24)
- Re: V6 still not supported Mark Delany (Mar 24)
- Re: V6 still not supported Joe Maimon (Mar 24)
- RE: V6 still not supported Pascal Thubert (pthubert) via NANOG (Mar 24)
- Re: V6 still not supported Mark Delany (Mar 24)
- RE: V6 still not supported Pascal Thubert (pthubert) via NANOG (Mar 24)
- Re: V6 still not supported John Gilmore (Mar 24)
- Re: V6 still not supported Pascal Thubert (pthubert) via NANOG (Mar 24)
- Re: V6 still not supported Philip Homburg (Mar 28)
- Re: V6 still not supported Pascal Thubert (pthubert) via NANOG (Mar 25)
- Re: V6 still not supported Philip Homburg (Mar 28)
- Re: V6 still not supported Masataka Ohta (Mar 28)
- RE: V6 still not supported Pascal Thubert (pthubert) via NANOG (Mar 28)
- RE: V6 still not supported Ryland Kremeier (Mar 28)
- Re: V6 still not supported Owen DeLong via NANOG (Mar 30)
- Re: V6 still not supported Matthew Craig (Mar 25)
- A straightforward transition plan (was: Re: V6 still not supported) John Curran (Mar 24)
- Re: A straightforward transition plan (was: Re: V6 still not supported) Philip Homburg (Mar 28)
- Re: A straightforward transition plan (was: Re: V6 still not supported) John Curran (Mar 25)
- Re: A straightforward transition plan (was: Re: V6 still not supported) Philip Homburg (Mar 28)