And in which part of the header is this to be added ? -- J. Hellenthal
The fact that there's a highway to Hell but only a stairway to Heaven says a lot about anticipated traffic volume. > On Oct 6, 2019, at 15:58, b...@theworld.com wrote: > > >> On October 6, 2019 at 15:18 mpal...@hezmatt.org (Matt Palmer) wrote: >>> On Sat, Oct 05, 2019 at 04:36:50PM -0400, b...@theworld.com wrote: >>> >>> On October 4, 2019 at 15:26 o...@delong.com (Owen DeLong) wrote: >>>> >>>> OK… Let’s talk about how? >>>> >>>> How would you have made it possible for a host that only understands >>>> 32-bit addresses to exchange traffic with a host that only has a 128-bit >>>> address? >>> >>> A bit in the header or similar (version field) indicating extending >>> addressing (what we call IPv6, or similar) is in use for this packet. >> >> How does that allow the host that only understands 32-bit addresses to >> exchange traffic with a host which sets this header bit? > > As I said, it doesn't, but it lets each host decide that rather than > the router tho if the host just knows enough to copy out the entire > src/dst address (imagine the bits beyond the first 32 were in > something like an extended ICMP options field w/in the IP header) then > the rest could operate identically to ipv4. > > So all you'd need added to a host IPv4 stack would be if you see this > extended addressing flag/bit/whatever then there's more that needs to > be copied out to each outgoing IP packet. > > It would be the routers' job to interpret those extra bits for routing. > > -- > -Barry Shein > > Software Tool & Die | b...@theworld.com | > http://www.TheWorld.com > Purveyors to the Trade | Voice: +1 617-STD-WRLD | 800-THE-WRLD > The World: Since 1989 | A Public Information Utility | *oo*
