Mark is right.  It's not a valid restriction.

<speculation>
The rule was likely put in place by someone with only MVS "mainframe"
knowledge.
</speculation>

Even so, there are shops which had mainframes on the public internet
15+ years ago and there are shops *today* with mainframes on the
public internet.  It's a question of managing risk, which pre-requires
understanding the risks, which in turn pre-requires understanding the
systems.

Be prepared for a long conversation with learning needed on both sides.

-- R;   <><
Rick Troth
Velocity Software
http://www.velocitysoftware.com/





On Wed, Mar 30, 2011 at 11:56, Ron Foster at Baldor-IS
<rfos...@baldor.com> wrote:
> Hello listers,
>
> Our company has recently been acquired by another company.  We are at
> the point of having to get our two networks to talk to each other.
> Before we can do that, we have to comply with certain security rules.
> One of them being that the mainframe cannot be exposed to the internet.
>
> We have a couple of zLinux web servers that are running in a couple of
> z/VM guests that are connected to our DMZ.  The new folks say this is a
> show stopper as far as hooking up the two networks.
>
> The questions I have are:
>
> Is this a common restriction?  That is, you have to have your DMZ based
> web servers running on some other platform so that your mainframe is not
> exposed to the internet.
>
> Or, the new folks just don't understand the built-in security provided
> by the z10 and z\VM 6.1.
>
> I know that we will end up conforming to the rules that the new folks
> have, but I was just wondering if the new folks really know what they
> are talking about.
>
> Thanks,
> Ron
>
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