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Router to Router Connections
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Suppose you have, for example, a DSL504 ADSL Moden/Router which is a 4
port router (in addition to being an ADSL modem). You've bought a
second (perhaps even a wireless) router and want to plug this into the
network to share all local machines, and to share the Internet
connection. Let's refer to the ADSL router as router A and the
second router B.
Configure router A to issue DHCP addresses in some range that
does not include one IP address that we will use for router B
For example, router A might only issue IP's in the range
192.168.0.2 to 192.168.0.200 and we'll configure router B
with 192.168.0.233. This is all the setup that is required for router
A, which otherwise has DHCP enabled and its usual WAN setup
for your ISP.
Disable DHCP for router B, and configure its WAN to
any STATIC IP. Specify a gateway IP of 0.0.0.0 (or perhaps
192.168.111.1--some routers will not allow 0.0.0.0). This will stop
it sending traffic to its WAN (we won't be using this router's WAN
connection). Further configure the WAN Type to be Static with a WAN
IP of 192.168.111.2 perhaps (should be different to the A
network), and a Subnet Mask of 255.255.255.0.
The LAN configuration for router B should be set to
STATIC with an IP address within the subnet of router A but
outside its DHCP range. We might set the LAN IP to 192.168.0.233 with
a Subnet Mask of 255.255.255.255 and with DHCP Disabled. In fact,
router A will serve as the DHCP server for anything connected
to router B.
Make sure nothing is plugged into router B's WAN. Connect a
LAN ethernet port of router B to a LAN ethernet port of
router A to have them talking to each other.
Router \textit{A} Router \textit{B}
WAN: --> ISP modem WAN: Empty ethernet
Configured for ISP Static IP with Gateway 0.0.0.0
LAN: LAN:
IP=192.168.0.1 IP=192.168.0.233
Subnet 255.255.255.0 Subnet 255.255.255.255
DHCP: Enabled DHCP: Disabled
LAN Ethernet Cabling:
(1) <======================> (1)
(2) --> PC1 (2)
(3) --> PC2 (3)
(4) --> PC3 (4)
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That's it!
Now, computers serviced by router B will be assigned DHCP by
router A, within the 192.168.0.* network, together with DNS
assignments. Router B is just another IP node on
A's network. Any LAN computer can access and configure
router B by accessing it as 192.168.0.233. All computers
will be on the same network subnet and so they will have access to
each other for file and printer sharing.
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