Routing multiple internal subnets

From: Graydon Mah <mahg_at_smtpgw.ucfv.bc.ca>
Date: Tue, 01 Aug 1995 10:19:22 -0700

Hi there!

Here's a question on routing.

I've got 25 class C addresses for use within our campus. So far we've been using
just one class C range to serve our site, but expansion has forced us to
collapse our Ethernet backbone and get the other class C ranges in to action.

We're using a cisco router to connect to the Internet. And a Gandalf VLS to
house our internal routers. The VLS contains multiple routers within one
cabinet.

            +---------+
            | Router |
Internet ---| x.x.1.1 |
            +---------+
                 | +------------+
                 | | nameserver |
                 +-------| x.x.1.2 |
                 | +------------+
                 | +------------+
                 | | host |
                 +-------| x.x.1.3 |
                 | +------------+
                 | +------------+ +-----------+
                 | | VLS | | PC1 |
                 | |============| +-------| x.x.2.254 |
                 +-------| x.x.1.10 | | +-----------+
                         |============| |
                         | x.x.2.1 |-------+ +-----------+
                         +------------+ | | PC2 |
                                              +-------| x.x.2.253 |
                                                      +-----------+

Here is netstat -r on nameserver x.x.1.2:
 Routing tables
 Destination Gateway Flags Refs Use Interface
 Netmasks:
 Inet 255.255.0.0
 Inet 255.255.255.0
  
 Route Tree for Protocol Family 2:
 default x.x.1.1 UG 1 74790 tu0
 localhost localhost UH 3 275692 lo0
 x.x.1 x.x.1.2 U 17 2495758 tu0
 x.x.2 x.x.2.1 UG 2 18726 tu0

So far:
 -PC1 can ping PC2 as expected (0 ms)
 -PC1 pings nameserver x.x.1.2 immediately (0 ms)
 -PC1 telnets nameserver x.x.1.2 in 1 minute 20 seconds! (why?)
 -PC1 cannot ping, telnet, or traceroute to the Internet
 -nameserver x.x.1.2 can ping PC1 immediately (0 ms)
 -nameserver x.x.1.2 cannot succesfully traceroute PC1:
  % traceroute x.x.2.254
  traceroute to x.x.2.254 (x.x.2.254), 30 hops max, 38 byte packets
   1 x.x.1.10 (x.x.1.10) 10 ms 0 ms 0 ms
   2 * * *
   3 * * * and timeouts thereafter

I've got plenty of VLS help available. I need some information on how routing
should be set up on the nameserver (x.x.1.2), an OSF/1 v3.0 alpha.

Regards,
Graydon Mah, Database Administrator,
University College of the Fraser Valley,
Abbotsford, British Columbia, Canada
Received on Tue Aug 01 1995 - 19:40:13 NZST

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