Combining 2 Lans

woodjl1650 · ‎09-10-2011

I have two LANs in my house, one 10/100 base and the other 10/100/1000, but one internet connection that I would like to have access to on both networks. Right now I have two Belkin routers for each network. In addition I have a Cisco 2600 and 3660. I know they are old, but they seem to be in operational order. Can I use those to combine to two networks? The only thing I want to maintain is the speed on the gig network, from the router to the PC's and devices.

This is the setup right now:

Cable Modem--->Belkin Router (Gigabit Router, 192.168.1.1)--->D-link Gig Switch ---> inside devices

Belkin Router (10/100 Base, 192.168.2.1)--->Cisco 2900XL Switch ---> inside devices

Cisco 3660 - two FE ports (no configuration)

Cisco 2600 - three E ports (no configuration)

Thanks for the help

Alexander Maroukian · ‎09-10-2011

Hi,

If you want just to use the internet connection you can connect the wan port of the second belkin router to the one with the internet connection (to some of the switchports) and give the wan port ip address from the network of the first network (192.168.1.0) and point gateway 192.168.1.1. This way you will have Internet connection on your 192.168.2.0 network.

If you need to have access to the 192.168.1.0 network from second network and vise-versa then you have to define router mode in your device and add 192.168.1.0 and respectively 192.168.2.0 networks in their routing tables.

Both can be implemented without the need of additional routers if something else is not required.

Regards,

Alex

woodjl1650 · ‎09-10-2011

So with that, I would be able to see connected devices on the entire network? From what I have read on exactly how to do this, I can't. Could do this: Modem ---> Cisco 2600 (192.168.1.1) ---> Belkin Router --->192.168.2.1 inside devices

---> Belkin Router ---> 192.168.3.1 inside devices

Then just setup the Belkin routers to grab internet from the 2600?

Alexander Maroukian · ‎09-11-2011

You should check if you can add static route and disable nat on your belkin router (the 192.168.2.0). To add static route check under "route" options and disable nat under "nat" options. Then if that is possible you should configure your wan port (of the 192.168.2.0 router) which is connected to the lan port of the other router (192.168.1.0 router) with ip address(e.g. 192.168.1.2) and gateway from 192.168.1.0(e.g. 192.168.1.1) network. Then on your internet connected router under route you should add route 192.168.2.0/mask 255.255.255.0 which points to the wan port ip address of the (192.168.2.0 network) second network router (e.g. 192.168.1.2) which you have assigned in the step before. This should satisfy your need.

If you just want to have the internet connection and not routing between the two networks just set static ip address and gateway of 192.168.1.0 network to the wan port of the not internet connected (192.168.2.0) router.

Best regards,

Alex

woodjl1650 · ‎09-11-2011

I think I am going to add another router to the picture to take some of the load off, I will be adding a router for the security cameras. Now my question is, since I have three seperate networks, all going into the 3660 as well as the internet connection, how do I configure the 3660 to support it? My ISP dishes out DHCP address and not static, I think I have the basic config down, but would like help on making sure it is good to go. Below is what I have thus far. Also, I am not sure of the routing command, could you please help with that as well?

hostname Cisco 3660

!

no ip domain-lookup

!

interface FastEthernet0/0 ------> Cable Modem

ip address dhcp

ip nat outside

duplex auto

speed 100

!

interface Ethernet1/0 ------>Router 1 w/DHCP enabled

ip address 192.168.2.254

ip nat outside

duplex auto

speed auto

!

interface FastEthernet0/1 ----->Router 2 w/DHCP enabled

ip address 192.168.1.254

ip nat outside

duplex auto

speed 100

!

interface Ethernet1/1 ----->Router 3 w/DHCP enabled

ip address 192.168.4.254

ip nat outside

duplex auto

speed auto

!

Alexander Maroukian · ‎09-12-2011

Are you connecting to your ISP using some kind of PPPxx authentication?

Now you have 4 networks not 3. You have one network more which is this connection?

Use "ip dns server" if your cisco router will be pointed as dns.

This is sample config for your nat/pat (I assume you have one IP address provide by the ISP):

hostname Cisco 3660

!

no ip domain-lookup

!

interface FastEthernet0/0 ------> Cable Modem

ip address dhcp

ip nat outside

duplex auto

speed 100

!

interface Ethernet1/0 ------>Router 1 w/DHCP enabled

ip address 192.168.2.254

ip nat inside

duplex auto

speed auto

!

interface FastEthernet0/1 ----->Router 2 w/DHCP enabled

ip address 192.168.1.254

ip nat inside

duplex auto

speed 100

!

interface Ethernet1/1 ----->Router 3 w/DHCP enabled

ip address 192.168.4.254

ip nat inside

duplex auto

speed auto

!

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0

access-list 1 permit 192.168.0.0 0.0.240.255

ip nat inside source list 1 interface FastEthernet0/0 overload

If you use pppoe we should add dialer interface and change the config a bit. So that you will have new outgoing interface.

This is very very simple config a lot of other settings could and should be applied depends on your specific needs.

Regards,

Alex

Alexander Maroukian · ‎09-12-2011

Just to add, if your other routers (belkin) are not setted up to allow traffic from the other inside networks then the communication between them will not happen you will only be able to reach internet. You have to permit it (if possible) or disable their firewalls as I write you in previous post but then you should enable firewall on your cisco router used as gateway if the IOS version include this feature.

Regards,

Alex