[Bug 227313] net/isboot-kmod works with net/istgt but not with ctld(8)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227313

--- Comment #15 from John Nielsen <john at jnielsen.net> ---
It looks like isboot is failing to respond to the ping requests (NOP In) sent
by the target (ctld) so the target drops the connection. From
https://datatracker.ietf.org/doc/html/rfc3720#section-10.18 :

   Upon receipt of a NOP-In with the Target Transfer Tag set to a valid
   value (not the reserved 0xffffffff), the initiator MUST respond with
   a NOP-Out.  In this case, the NOP-Out Target Transfer Tag MUST
   contain a copy of the NOP-In Target Transfer Tag.

That is not happening. Not sure if other targets don't use this ping behavior
but I don't see anything in the isboot code that would meet this requirement.

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