On Tuesday, 12/14/2004 at 04:30 CST, "Nix, Robert P."
<[EMAIL PROTECTED]> wrote:

> I've found the statement in the book that "Direct connectivity between
the four
> Hipersockets is not provided; however, connecting them via routing of
any
> TCP/IP stack that has a connection to the specific Hipersockets devices
is
> permitted." Huh? I thought the whole point was to allow things to talk
together
> and avoid an outside hop. This reads, to me, like I have to make a hop
outside
> to get between systems connected directly to the Hipersocket. What's the
good
> of that? And this doesn't seem to be exactly true, since I can talk
between zVM
> and zLinux, and that would seem to be two systems directly connected via
the
> same Hipersockets.

They just mean that the HiperSockets themselves (the chpids) are not
interconnected within the box; you must route between them.  All
subchannels defined in a particular HiperSocket chpid are interconnected.

> There has to be something simple I'm missing. What do I need to do to
talk to
> the zOS machine in the other LPAR? Is there something that needs to be
done on
> / for the zOS TCP/IP stack? Is there a definition I'm missing?

Double check your IP addresses and subnet masks.  The HiperSocket must be
treated like a separate LAN segment with its own IP subnet and unique IP
addresses.  Packets may be making their way to z/OS, but the responses may
not be making their way back.

Alan Altmark
z/VM Development
IBM Endicott

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