On Thursday, 01/17/2002 at 06:35 PST, Lionel Dyck <[EMAIL PROTECTED]> wrote: > WAN <--> 2216 <--> z/VM <--> lots of Linux guests > > I have been given my own subnet for the Linux guests (x.x.x.0) and told I > can use all the addresses from .20 to .254 > > So I requested dns entries for linux1, linux2, ... with linux 1 being > x.x.x.21 and linux 2 at x.x.x.22 .... > > I was told that I should use a netmask of 252 and if I remember from > somewhere that using that netmask will preclude using this scheme. > > The question is can I use a netmask of 255.255.255.0 and still use this > addressing scheme ?
If you use static routing, you need to use HOST routes and enable ProxyARP while you get your network people to assign another subnet to you for your Linux guests. Since the Linuxen aren't connected to the LAN, they should not be given IP addresses that are in the LAN subnet. Proxy ARP will provide you some short term relief, but you need to get the networking fixed. z/VM will act as a network router. If you have dynamic routing, then you need another subnet. Use .252 masks until you (1) get a Linux HipersSocket (qeth/qdio) device driver that works, and (2) switch to z/VM guest LANs and just have a single subnet for all of them, without any waste of IP addresses. (This is a difficult subject to discuss without pictures.) Regards, Alan IBM Senior Software Engineer z/VM Development, Endicott, NY Phone 607.752.6027 fax 607.752.1497 t/l 852
