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What about IPv6?
– curiousguy
Commented Jul 18, 2012 at 1:40
1

What about IPv6? It's just IP. There interface of sending and receiving a packet remains the same. So, TCP can use the same function. OS can just replace the function pointer from IPv4 and IPv6 and it would still work. I am not sure what you are saying here ?
– SurenNihalani
Commented Jul 18, 2012 at 3:59
3

IPv6 and IPv4 are similar, with similar interfaces for upper layers, but certainly not the same protocol and not strictly functionally equivalent either.
– curiousguy
Commented Jul 18, 2012 at 4:10
1

You might as well pretend that UDP is the same protocol as IP, because they offer extremely similar interfaces to upper layers: set a local and a remote endpoint addresses, send and receive packets...
– curiousguy
Commented Jul 18, 2012 at 4:16
Yes but TCP over IPv6 is just another proof that IPv4 is not a required protocol for implementing TCP. You can as well implement TCP over a non-routing protocol, it just requires a lower layer that includes an input stream and an output stream; the lower layer does not even need to use datagrams: TCP over a bidirectional serial link or over a software I/O pipe does work as well. There are in fact many posibilities, widely used on the Internet, including TCP over HTTP or HTTPS and various VPN protocols.
– verdy_p
Commented Jan 12 at 5:34

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