On Tue, Dec 14, 2004 at 04:30:12PM -0600, Nix, Robert P. wrote:
> ... wait a minute... It's all confusing.

> 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.

All they're saying there is that each hipersocket is a separate network
segment. It's like having 4 different wires; things connected to the
same wire can talk to each other, but not to the things on the other
wires unless there is something connecting wire A to wire B, eg a
virtual machine or external device acting as a router.

> 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?

You need a network interface on both systems, and a connectivity path between
the two.  If you connect the network interface on VM or Linux to the
same hipersocket to which the network intface on z/OS is connected,
the two can talk directly. If they are on different hipersockets, then
you need another TCP stack that connects the two hipersockets and acts
as a router OR you need to exit the box to a dedicated router and back
in.

Bad ASCII pictorial:


VM ------ hipersocket ------- z/OS         for same hipersocket



VM --hs1-- virtual machine router --hs2-- z/OS  for diff hipersocket


-- db

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