> I was curious about this, so I looked it up, and I don't think it is. IP is certainly versioned (IPv4 vs. IPv6), but looking at the list of protocol numbers[0], I only see one entry for TCP. And I don't see anything that looks obviously like 'TCPv2'.
Currently there is only a single TCP, it didn't need new version, because it has options mechanism to add additional information as needed. If it would need to be redesigned a new protocol would be created and a new protocol number would be allocated. Kind of like what happened with ICMP and ICMPv6.
> I was curious about this, so I looked it up, and I don't think it is. IP is certainly versioned (IPv4 vs. IPv6), but looking at the list of protocol numbers[0], I only see one entry for TCP. And I don't see anything that looks obviously like 'TCPv2'.
Currently there is only a single TCP, it didn't need new version, because it has options mechanism to add additional information as needed. If it would need to be redesigned a new protocol would be created and a new protocol number would be allocated. Kind of like what happened with ICMP and ICMPv6.