Okay, so after digging a bit, the default values from iscsid.conf are
in fact being superseded by the specific session values. That is
demonstrated when I run "iscsiadm -m node -T internal_redirect". The
only problem is the values aren't applied to the running session (the
sysfs attribute files for the session are not updated when the record
is updated).
I was changing the values for a session that was already established.
The solution is to set the node record values, then simply logout and
login.
--Marc