On Mon, Sep 04, 2017 at 10:54:44AM +0200,
 Walter H. <walte...@mathemainzel.info> wrote 
 a message of 25 lines which said:

> I'd say: "either you trust the local net or not";

I don't claim to be a security expert, but I think it is a
mistake. Many local networks are vulnerable to packets with an
internal address coming from the outside, routing attacks diverting
traffic outside, etc. Not to mention the internal attacks, for
instance by a MS-Windows zombie.

It seems to me that having TLS, DNSSEC and SSH and so on even in the
local net is Best Practice.

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