tomc@dftsrv.gsfc.nasa.gov (Tom Corsetti) (01/25/89)
Hi There!
I have a question about subnetting. We are currently using
255.255.0.0 as our net mask for our class b network. That is, we're
not subnetting. We have filtering bridges separating the buildings,
but no dedicated routers (except for the ones that give us our connection
to the internet). There are almost 400 hosts on the lan. The mixture
is a heterogenious one consisting of both 4.2 and 4.3 bsd, system V,
IBM PCs, Macs, Vaxen running VMS, AIX machines.. etc. Alot of these
systems don't understand subnets. There is one group that we have
assigned a subnet address to. They have a ring of apollos, one of which
has two network interfaces. They are trying to isolate the traffic
amoung their apollos behind the machine with two interfaces. In other
words, they are trying to use the apollo with 2 ethernet boards as a
gateway for the rest of the machines. Here's the problem (finally):
They can't get the rest of the net to talk to them through the gateway.
Does every machine on the lan have to set up explicite routing information
to know to send packets destined for their subnet address to their gateway?
Is there a way to get their apollo gateway to advertise that it is a gateway
for the other machines? This problem is compounded by the fact that everyone
else on the net has a subnet mask of 255.255.0.0, while they're trying
to set up a subnet where the mask is 255.255.255.0 on the SAME class b
address space. Has anyone met up with this problem before? Any words
of wisdom are highly appreciated. I really want to get a good understanding
of this stuff. Thanks very much in advance!
- Tom Corsetti
--
Tom Corsetti * * * * internet - tomc@dftsrv.gsfc.nasa.gov
NASA/Goddard Space Flt Ctr * * * decnet - dftnic::tomc
Greenbelt Maryland * * * * bitnet - tomc at dftbit