Hi Andrew,

> The example in:
> 
>   3.1. Discovery of TCP Transport Support for IKEv2
> 
> has:
> 
>    Initiator switches to TCP:4500 for IKE_INTERMEDIATE /
>    IKE_AUTH / subsequent IKEv2 exchanges
> 
> When opening the new TCP connection, does the initiator include the
> IKETCP prefix; like it would if it started with TCP for IKE_SA_INIT?

Yes. Similar situation can happen with RFC 9329 and MOBIKE - 
you can switch to TCP in the middle of IKE communications
and you always start it with IKETCP prefix (see Appendix B.4in RFC 9329).

> (I'm pretty sure the answer is yes, it's just that all the text says
> is "the initiator MUST switch to TCP port 4500 for subsequent
> exchanges")

We can add a clarification that IKETCP prefix is always included.

Regards,
Valery.

> Andrew
> 
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