Mailing List SIMS@mail.stalker.com Message #14359
From: <billc_lists@greenbuilder.com>
Subject: Re: cbl.abuseat.org false positive
Date: Thu, 18 Mar 2004 23:47:15 -0600
To: SIMS Discussions <SIMS@mail.stalker.com>
At 6:58 PM -0600 3/18/04, Larry Stone wrote:


That's what I was thinking. But when I do that, everything works fine for
about 30 seconds and then all heck breaks loose on the network. Constant
activity everywhere including on the WAN side. My guess is something is
triggering an ARP storm but why I don't know and it could be something else.

Here, as best I can do in ASCII, it how I'm hooking it up.

                          +--------------------+
                          |     DSL Modem      |
                          +--------------------+
                                    |
                          +--------------------+
                          |        Hub         |
                          +--------------------+

Try changing the IP on router 1 to 192.168.2.1.  You may have it set up so that they're both trying to use the same address space.

                      |            |
                  +---------------+    +------------------+
                  |  x.y.z.6 (WAN)|    |  x.y.z.14 (WAN)  |
                  |   Router 1    |    |  Router 2        |
                  |  192.168.1.1  |    |  192.168.1.9     |
                  +---------------+    +------------------+
                    | |      |  +----------+        |
       +------------+ |      |                      |
       |              |      |                      |
   +---------+  +--------+  +--------+          +------------+
   | Basement|  | Client |  | Printer|          | Mail Server|
   | Hub     |  | iMac .2|  | DHCP   |          | Mac G4 .3  |
   +---------+  +--------+  +--------+          +------------+

DHCP server enabled only on Router 1. All except the Mail Server has
192.168.1.1 as the default gateway; the Mail Server has .9.

Router 1 is a Linksys BEFW11S4 wireless DSL (NAT) router; Router 2 is a
Linksys BEFSR41 wired DSL router.


I currently have two subnets on my LAN, and have had three in the past (the third is still there, it's just kept separate to avoid unnecessary noise).

What's probably happening is that Router 1 has a big enough subnet mask that it's trying to use the same IPs as Router 2.  The other alternative to the above would be to set them on different subnets: make the subnet mask of Router 1 (and all associated machines) 255.255.255.248 (which corresponds with 8 IP addresses, starting with 192.168.1.1), and Router 2 255.255.255.252 (4 IPs) or ...248




--
Bill Christensen
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