On Wednesday, 09/01/2004 at 10:41 AST, Bob <[EMAIL PROTECTED]> wrote:
> I have several Linux guests running under VM. 2 of these guests have
> actual OSA cards and a guestlan. The rest are just on the guestlan. I am
> told that in order for the rest of the network to see the linux guests
on
> the guestlan that the guests with the OSA cards need to broadcast out to
> the network that in order to get to the guestlan you have to go through
> the guersts with the OSA cards. Does anyone know how to setup the
> broadcast, I am not having much luck......
Guest LANs require separate subnets and virtual routers. The virtual
router is connected to the OSA on subnet #1 and to the guest LAN on subnet
#2. The outboard routers be told to route subnet #2 through the virtual
router. You can do that with either static or subnet routing. Draw
pictures and talk to your local network gurus. They'll help you.
(psssst....don't say "guest LAN", say "LAN segment", and they'll
understand immediately what has to be done...but whatever you do, don't
say "virtual LAN segment" or it will take days to untangle the resulting
mess!)
The Virtual Switch (z/VM 4.4) allows the guests to be in the same subnet
as the OSA card and eliminates the virtual router and a lot of discussion
with the above network gurus. It also lets you use the phrase "virtual
LAN" ("VLAN") and mean it.
Alan Altmark
Sr. Software Engineer
IBM z/VM Development
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