On Apr 12, 2011, at 4:03 PM, Mark Townsley wrote: > > Hello Dmitry, > > My view is that 4rd is most easily understood if and only if it connects to a > CE function that is performing NAPT. The CE function may be in what is > traditionally considered a host, or in what is clearly a router. > > More specifically, a device that is forwarding packets from one interface > (virtual or otherwise) to another through a NAPT that has one interface with > IPv6 configured (via DHCPv6 or otherwise) as performing 4rd (which enables > dual-stack via a port-restricted IPv4 address for the NAPT using IPv6 as the > transport) then you a have a 4rd CE. That could be a "host" in that it is a > Windows PC with internet connection sharing for IPv4 turned on and hence > forwards packets between interfaces with a NAPT due to the IPv4-enabled > interface created when 4rd is configured. > > I would avoid anything that requires the host forwarding table to be altered > to accommodate 4rd. Instead, the NAPT function that is already present in a > small router or host configured to look like a router is modified to use a > set of ports that it is allowed to use when 4rd is enabled.
Mark: How would an app running on a 4rd CPE communicate in IPv4 to another app running on another 4rd CPE? - Alain. _______________________________________________ Softwires mailing list [email protected] https://www.ietf.org/mailman/listinfo/softwires
