> Rsh on an internal z/VM virtual network achieves both.  Things like Live Guest
> Relocation introduces an anomaly into the equation, since a what appears as
> "internal" one moment may in fact be "remote" at the next.

??? Shouldn't the topology not change? Other than physical host changes, I've 
been assuming the LGR stuff effectively is a unit black box from external 
hosts. 
 
> Of course, protocol security discussions rarely deal with common sense, but
> with Rules Made To Be Followed Without Exception Because My Grandfather
> Told Me So.  Hence the descent into "rsh/rexec madness" and the unblinking
> acceptance of unsecured telnet.  Go figure.  (I can't believe that in 2011
> secure telnet is not de rigueur.)

Yeah. And then some. 

It is kinda surprising that VM and MVS still ship with plaintext tn3270 as the 
default. 

Sounds like a requirement. 

-- db

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