Satoru Matsushima wrote, on 08/01/2011 10:41 PM:
> Thanks, a clarification has made to clear a confusion of restricted port
> set/ranges and NAT session table limitation. Even if a CPE is allocated 256
> ports, NAT session can be made over 900G sessions in theory. ('2^32'<Full
> 32bits v4 address> - '2^29'<class-D/E> - '2^7'<0/8,127/8>) * 2^8<256 ports>.This is only true for endpoint-dependent NATs, which are forbidden by the BEHAVE RFCs (4787 and 5382). According to these RFCs, NATs MUST have endpoint-independent mapping behaviour. This means that each NAT session will consume one external port. Simon -- DTN made easy, lean, and smart --> http://postellation.viagenie.ca NAT64/DNS64 open-source --> http://ecdysis.viagenie.ca STUN/TURN server --> http://numb.viagenie.ca _______________________________________________ Softwires mailing list [email protected] https://www.ietf.org/mailman/listinfo/softwires
