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How do I connect two routers and have one wifi the other not.

Posted on 2011-03-02
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Last Modified: 2012-05-11
I have two routers; One is a Linksys WRT54g I flashed with DDWRT and the other is a Netgear wireless N router.

My Comcast enters the house upstairs and goes into one router the netgear, I will only have wired users use this router so I have disabled the wireless. I have a 80’ cable plugged into this router that goes downstairs to the other router and plugs into it. I want to use the downstairs router for wireless only for laptops and iphone, so I will set the mac filter for specific IP’s, this should keep any other wireless users off that wireless network.
My question is how do I connect the upstairs router to the downstairs router so that I can keep wired users plugged in (running DHCP) and then have DHCP running downstairs on the wifi router, yet the downstairs router is plugged into a port on the upstairs router that is DHCP.

Can someone please help me out or make a suggestion to get this to work.
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Question by:manelson05
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12 Comments
 

Expert Comment

by:dddoooeee
ID: 35017196
The Netgear router is capable of being a "Hot Spot Only" unit and not acting as a router.  If your DDWRT router is not capable of doing the same I would simply swap the routers positions and set the Netgear to act as a hotspot.
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Author Comment

by:manelson05
ID: 35017513
I understand that but how do you set Router 1 as DHCP coming from the gateway (comcast) whihc will automatically take an assigned ip  and then assigne dhcp addresses to the wired clients, keeping in mind that one port has a 80' cable that connects the router downstairs which broadcasts the wifi signal for wireless clients.
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Author Comment

by:manelson05
ID: 35017602
What about bridging?

Router 1 has DHCP server on it enabled, three ports are for computers upstairs, port 4 is a 80' cable that goes downstairs to the DDWRT router. If I plug the dhcp cable into a router then that router should be set to DHCP address. Will it still be able to hand out a dhcp address to the wifi clients on its mac list and accept additional wired clients?
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Expert Comment

by:Snibborg
ID: 35017645
The Netgear router will supply IP addresses to any device it sees on the network, whether that device is wired or wireless.  If you are trying to supply wired clients from one DHCP server and wireless from a second DHCP server you will get serious problems.

I would suggest that you use DHCP throughout, limit the number of IP addresses to the maximum number of devices you are going to use and then use MAC address filtering to prevent unauthorised access.

You should note that if you are using MAC filtering instead of encryption, like WPA or WPA2, the solution is less secure as a packet sniffer can pick out the MAC addresses and these can then be spoofed by modifying the registry of a PC.

Snibborg
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Author Comment

by:manelson05
ID: 35018242
Hows this look?

RTR 1
WAN: Comcast dhcp
LAN:
Router IP: 192.168.1.10
Router  dfg: 192.168.1.1
Router mask: 255.255.255.0
Static IP’s 192.168.1.11 – 13 PC’s
Router two: 192.168.1.14


RTR2

WAN:
192.168.1.14
192.168.1.1
255.255.255.0

LAN:
DHCP scope(8)
192.168.2.1 - 8


Static route: ip route 192.168.2.0 192.168.1.0
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Expert Comment

by:Snibborg
ID: 35018938
The one router will not see the other with that subnet, use 255.255.0.0.

Snibborg
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Author Comment

by:manelson05
ID: 35019129
So use 255.255.0.0 on Router 2 or what about changing Router 2 to the following?
RTR2

WAN:
192.168.1.14
192.168.1.1
255.255.255.0

LAN:
DHCP scope(8)
192.168.1.100-105
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Expert Comment

by:Snibborg
ID: 35019464
You need that subnet mask on both routers, as data travels both ways.

Snibborg
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Author Comment

by:manelson05
ID: 35020372
But 24 bit mask would not work on both?
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Accepted Solution

by:
Snibborg earned 500 total points
ID: 35020933
If you use what you indicate:

WAN:
192.168.1.14
192.168.1.1
255.255.255.0

LAN:
DHCP scope(8)
192.168.1.100-105

Then 255.255.255.0 can be used on both the router and the wireless as they are both on the same subnet.  The problem was that you were using 192.168.1.xxx for one set of addresses and 192.168.2.xxx as the other.  Once you do that, a class C subnet (255.255.255.0) will not work.

Now you've got rid of the 2 subnet everything should be fine.

Snibborg
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Author Closing Comment

by:manelson05
ID: 35069512
Thanks Snibborg
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Expert Comment

by:Snibborg
ID: 35070324
All part of the service.  Thanks for the points.

Snibborg
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