Hi Mark, I knew there was some "Golden Rule" I'd overlooked, that might be it ;-) I don't think I established clearly enough with them exactly what a z/VM guest is and can do, at least from the routing viewpoint, which as you say, is pretty well everything if it's z/VM itself or Linux or indeed just about anything I can think of.
I'm also starting to appreciate how good it will be when I get z/VM v4.3 and can use the broadcast ability of its QDIO guest LANs. Meanwhile, I'll see what the network blokes can do for me. thanks again, Peter Bishop GOSD Mainframe EDS Asia-Pacific phone +61 2 9378 0113 email [EMAIL PROTECTED] --------------------------------------------------------------------- Alan Altmark frequently makes reference to what he calls the "Golden IP Routing Rule:" "Two hosts in the same subnet can hear each other's broadcasts." Ask your networking folks if they think the setup they've forced on you will allow the SLES7 host to hear the broadcasts of the systems out in "the world" part of your diagram. To give them further food for thought, replace "z/VM 4.2 OSD channel" with "router" and the same for "z/VM 4.2 hipersocket." Note also that HiperSocket guest LANS don't support broadcast. QDIO guest LANS do. Mark Post
