topic Router Config HELP in Routing and SD-WAN

Router Config HELP

woodjl1650 — Mon, 04 Mar 2019 21:34:18 GMT

I have three different LANS that I want to be to accessable to each other. Each network has its own router and DHCP pool. Also I have my internet connection that I want pushed out to the 3 LANS. I believe I have my 3660 somewhat configured right, I am just having trouble with the routing config part. So far, this is what I have for my config on the 3660:

hostname Cisco 3660

no ip domain-lookup

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

ip address dhcp

ip nat outside

duplex auto

speed 100

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

ip address 192.168.1.254

ip nat outside

duplex auto

speed auto

interface Ethernet1/0 -----> Router 2 w/DHCP

ip address 192.168.2.254

ip nat ourside

duplex auto

speed auto

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

ip address 192.168.3.254

ip nat ouside

duplex autp

speed auto

Router Config HELP

woodjl1650 — Mon, 12 Sep 2011 01:04:38 GMT

Here is a diagram of what I am wanting to do.

Router Config HELP

Edison Ortiz — Mon, 12 Sep 2011 02:04:46 GMT

Just have the default gateway on every single device to point to .254 and they should be able to communicate with each other.

The internet can be handled at the 3600 as well and you simply have to add those subnets into the NAT pool list/ACL.

Router Config HELP

woodjl1650 — Mon, 12 Sep 2011 02:16:03 GMT

Awesome, thanks. One last question, can you provide an example of how add the .254 to the NAT pool list ACL

Router Config HELP

Edison Ortiz — Mon, 12 Sep 2011 14:53:37 GMT

access-list 1 permit 192.168.2.0 0.0.0.255

access-list 1 permit 192.168.3.0 0.0.0.255

access-list 1 permit 192.168.1.0 0.0.0.255

ip nat inside source list 1 interface f0/0 overload

int e1/1

ip nat in

int e1/0

ip nat in

int f0/1

ip nat in

int f0/0

ip nat out

Please remember to rate helpful posts.

Regards,

Edison

Router Config HELP

woodjl1650 — Mon, 12 Sep 2011 16:14:36 GMT

Awesome thanks, so on each router the default gateway for the WAN port needs to point to 192.168.1.254, 192.168.2.254, 192.168.3.254 for each router, correct?

Router Config HELP

Edison Ortiz — Mon, 12 Sep 2011 16:40:46 GMT

Per your diagram, the Linksys nor the D-link aren't doing routing - just the 3600.

Make sure the hosts are pointing to their respective .254

Router Config HELP

woodjl1650 — Mon, 12 Sep 2011 16:47:39 GMT

Each router is routing and providing the DHCP pool for each network. Is this still possible to combine all three LANs at the 3600...

I just tried to config the Linksys Router to point to the 3660, but had problems with the internet IP address. The only thing that took was 192.168.1.1 255.255.255.0 default GW 192.168.3.254 That doesn't seem right, since 192.168.1.1 is used in another network.

Hopefully I am not confusing. Thanks for the help

Router Config HELP

Edison Ortiz — Mon, 12 Sep 2011 17:13:00 GMT

You can configure DHCP on the 3600 router and just use the other devices as switches.

Here is a documentation on DHCP w/ IOS

http://www.cisco.com/en/US/docs/ios/12_0t/12_0t1/feature/guide/Easyip2.html

BTW, I re-read your diagram posting and you said 'you wanted to do' - my bad - I thought it was your current config.

Router Config HELP

woodjl1650 — Mon, 12 Sep 2011 17:17:01 GMT

I am wanting to keep the routers in place, and not have the 3660 do DHCP, unless it just to the routers and not to all the devices. Is there a way to do what I have in the diagram? I know it seems, odd, but this is what I would like to do, if at all possible. Thanks again.

Router Config HELP

Edison Ortiz — Mon, 12 Sep 2011 21:57:49 GMT

If you want to keep the routers in place, then you can't accomplish what you've shown in the diagram.

First instance, you can't have the Linksys router having an interface on 192.168.2.x facing your clients and another interface on the same subnet 192.168.2.x facing the 3600.

You have to place the 3600 on the same subnet as the clients and the linksys won't route in this case but bridge the packets.

You can have the linksys provide the IP address if you want but the default gateway must be .254 - not the Linksys itself. I'm not sure about the D-Link configuration caveats but the end result must be the gateway for all hosts must end up at the 3600 for this to work.

I'm not sure why you don't want to configure DHCP on the 3600, it's fairly easy.