kellen@UV4.EGLIN.AF.MIL ("Dan Kellen") (06/15/90)
Thanks to all the people that sent help or solutions to my problem.
I was trying to set up the first subnet on a class B network, without
converting the whole network. We have been assigning addresses as if
we were subnetted; each building has a unique third octet.
The buildings are tied together with ethernet bridges, not IP routers.
Here's the solution I implemented.
I have configured both interfaces on the subnet gateway and all subnet
machines on the subnet with class C netmask's and broadcast addresses.
Meanwhile all other hosts on the network still have their class B netmask.
I consider this a temporary configuration.
Getting routing to work was my biggest problem. Here's what I've done.
On the subnet machines, I added a default route pointing to the
subnet gateway.
route add default 129.61.9.2 1
On the subnet gateway, I added a default route pointing to the main
network with a metric of zero.
route add default 129.61.2.40 0
On main network machines that want to talk to the subnet machines I have
had to add host routes. I could not get dynamic routing to do this.
route add 129.61.9.4 129.61.2.40 1
Since that time, I have changed my main network gateways to announce a
default route via RIP. I probably should have done this sooner, but we
are still moving from static routes to RIP. I won't have to add the
default routes on the next subnet.
I have been watching for broadcast storms, and have seen none. But, when
the subnet gateway RIP's to the subnet 2 broadcast, other RIPers send it
a redirect.
Here's how it looks.
network: 129.61.0.0 network: 129.61.2.0 network: 129.61.9.0
netmask: 255.255.0.0 netmask: 255.255.255.0 netmask: 255.255.255.0
this int. only +-----+
| | |
/\ \/ +-----| SUN |
| | | |
| +-----+ | +-----+
| 129.61 | | 129.61 |
|-------------| SUN |--------+
| 2.40 | | 9.2 |
| +-----+ | +-----+
| | | |
| +-----| SUN |
\/ | |
+-----+
Dan
------------------------------------------------------------------
Digital Equipment Corp. Internet: kellen@odixie.enet.dec.com
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System/Network Manager Internet: kellen@uv4.Eglin.AF.MIL
Eglin AFB, Florida PHONEnet: (904)882-5498