> A simpler design would mimic ALPN.  The initial SYN, would include a list
> of options. The SYN+ACK would contain the selected option. A single octet
> each should suffice for the option. tcpcrypt would need but a single
> codepoint, as would tcp-use-tls.

If you have a TCP option codepoint for ENO you shouldn't need any
others. The rest of the parameters - including which mechanism is used -
should be part of the negotiation inside the option.

Joe

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