Oh yes, I have complete control of 10.1.20.0/24. Within this I have
only about 6 addresses assigned (and all <128). So, I decided to subnet
it to 10.1.20.0/25, giving me two nets of 126 addresses. The >128 would
be the internal (to the z9) addresses and the <128 external.
Frank M. Ramaekers Jr.
Systems Programmer MCP, MCP+I, MCSE & RHCE
American Income Life Insurance Co. Phone: (254)761-6649
1200 Wooded Acres Dr. Fax: (254)741-5777
Waco, Texas 76710
-----Original Message-----
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Alan Altmark
Sent: Wednesday, November 11, 2009 4:13 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: TCP/IP and VSWITCH
On Wednesday, 11/11/2009 at 04:31 EST, "Frank M. Ramaekers"
<framaek...@ailife.com> wrote:
> That's great, if I was wanting to rework the entire mainframe network.
> My plans were just to route any intra-mainframe IP traffic onto a
> VSwitch and leave all of the external communication to the current
> method(s) (dedicated OSA). (You know the adage KISS).
>
> I do like the redundancy with VSWITCH with multiple OSAs though.
(Maybe
> sometime in the future.)
As a side note, did you discuss with your Network People first? To do
what you want with VM TCP/IP means creation of another IP subnet and
addresses and, possibly, the use of VIPA. That depends on whether or
not
you care about what IP address VM TCP/IP uses as an origin IP on
outbound
packets.
Yes, reconfiguring network flows can be a non-trivial effort. That's
why
they deserve some thought before you deploy. Rule #1 of virtual
networking: Never EVER make virtual network configuration changes
without
the express [written, preferably] approval of the Networking People.
Just
"peeling off" the packets to a particular host is easily done, but the
ramifications of doing so are glued to the Law of Unintended
Consequences.
("What? I need VIPA just to do *that*? That means MPROUTE!")
Alan Altmark
z/VM Development
IBM Endicott
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