On Wednesday, 05/01/2002 at 09:28ZE10, Vic Cross <[EMAIL PROTECTED]> wrote: > Romney White wrote: > > > Broadcast on a QDIO Guest LAN sends > > datagrams to all guests whose NICs are connected to that LAN. > > Just what I'd expect broadcast to do! ;-) However, broadcast packets are > really just packets sent to a special IP address, that the stack(s) and the > network treat in a special way. So, since the z/VM support is "the network" > in this case, the question is does it handle both local-net broadcast (i.e. > address 192.168.0.255 on the 192.168.0.0/24 network) and "all-Fs" broadcast > (as used by DHCP clients)? > > > You'll want to put your DHCP server and its clients on the Guest LAN. > > Exactly! So I'm assuming that both types of broadcast are supported, and > that DHCP will work...
Vic, at the adapter level, there is no difference between an "all-Fs" broadcast and a subnet-directed broadcast. The adapter doesn't know subnets from a hole in the ground. It's all handled at the IP layer, not the media. That is, a subnet-directed broadcast is simply a datagram unicast to the router, which forwards it (if you are lucky) until the target subnet router receives it and converts it to a local media broadcast. Alan Altmark Sr. Software Engineer IBM z/VM Development
