Member Avatar for Khaoz11

I have 2 boxes that enable me to use the internet, one is a modem

westell c90-610030-06 (provided by my isp, bellsouth)

and the other one is my router (store bought, wireless router, links all 3 of my computers)

Linksys WRT300N

to be able to forward my ports correctly, i must forward the ports to both of these boxes.

Now, the ip addresses are different on both of them, 192.168.3.### on the linksys, and 192.168.1.### on the modem. i have my static ip set up to my linksys. wich works fine.

However when i try to forward my static ip address: 192.168.3.159, to my modem(westell) it tells me its not compatible with the private ip adress 192.168.1.###

my connection only works when my static ip is set up with my Linksys router, but when i try to change the Linksys router ip address to , none of my computers get internet. :-/

note: none of my computers are set up with a static ip address except mine.

-is there anything i need to do to my computers after i change the linksys ip to , to allow them to connect to it? or is there another problem?

ill be on most of the time to answer any questions about my setup.

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  • Latest Post Latest Post by hoektoe

Dani AI

Generated

A quick diagnosis for : the Westell and the Linksys are creating a double‑NAT situation. The Westell is routing on 192.168.1.x and the Linksys is NATing a different LAN (192.168.3.x). The Westell will only forward ports to an IP on its own 192.168.1.x network, so trying to point it at a 192.168.3.x address will be rejected. That also explains why changing the Linksys LAN to 192.168.1.1 broke connectivity — it created an IP/gateway conflict and put the router’s WAN and LAN on the same subnet, which stops normal routing.

Three practical ways to fix this:

  • Remove double NAT (best for gaming/servers): put the Westell into bridge/passthrough (or enable its DMZ/passthrough feature) so the Linksys receives the ISP/public address and performs all NAT/port forwarding. Confirm the Linksys WAN shows the public IP and configure port forwards there.

  • Make the Linksys an Access Point (easy and stable): disable DHCP on the Linksys, set its LAN IP to a free address inside the Westell’s 192.168.1.x range (for example 192.168.1.2), and connect the Westell LAN -> Linksys LAN (do NOT use the Linksys WAN port). All clients will be on one subnet and forwarding only needs to happen on the Westell.

  • If keeping both routers as routers (double NAT): give the Linksys WAN a fixed 192.168.1.x address (or reserve it via Westell DHCP). Then forward ports on the Westell to that Linksys WAN IP, and forward the same ports on the Linksys to the final host on 192.168.3.x. Example mapping:

Westell:  external port 12345  -> 192.168.1.50:12345   (Linksys WAN)
Linksys:  external port 12345  -> 192.168.3.159:12345  (internal host)

Quick troubleshooting checklist: verify which device has the public IP (router status pages), reserve static/reserved WAN IPs to avoid DHCP changes, reboot both routers after changes, and run DHCP renew on clients (or reboot clients) so they pick up new gateway. Security note: using DMZ or wide port opens increases exposure—keep firmware up to date and strong admin passwords.

Advice from and is relevant: confirm whether the Linksys is router‑only (WRT300N is a router, not an ADSL modem) before trying to replace the ISP box.

Recommended Answers

All 8 Replies

Member Avatar for Khaoz11

BUMMBBB come on ^^ big community = more help? xD

Member Avatar for zeroth

Now, the ip addresses are different on both of them, 192.168.3.### on the linksys, and 192.168.1.### on the modem. i have my static ip set up to my linksys. wich works fine.

Are you setting the static because you want it to be that, or have you been assigned a static IP by the ISP (or some entity)?

Are you using DHCP?

Member Avatar for Khaoz11

Are you setting the static because you want it to be that, or have you been assigned a static IP by the ISP (or some entity)?

Are you using DHCP?

yeah i am using DHCP, well i cant set up my static ip to work with both of my routers. they have different addresses.

Member Avatar for zeroth

Please give me more info about the static IP. Like why you are using a static IP, why you chose this particular one, did someone assign it to you?

I need more of a picture of the setup and why you're doing it this way in order to help...

Member Avatar for digitalocksmith

Why do you need two routers for the one LAN?

Ditch the ISP supplied modem and utilize the linksys with the inbuilt modem configured with your ISP server access details.

Modem addy should be 10.0.0 etc

Member Avatar for belch85

I have a similar issue - One physical location, two buildings, two routers, two ISP's.

They are on the same physical network - but operating under different IP ranges.

Router A:
Router B:

All I want is for all the computers on both sides to see each other so we can share files and play LAN games. So how can a computer see a computer on this setup?

Regards,
Simon
Please forward your response to

Member Avatar for hoektoe

Please respond or give solution here as i have same problem. two routers, and networks with different ip ranges. Need to share files from one to other.

one ip range 172.18.86.## connects to external Wireless network
192.168.1.## is internal wifi.

have pc's on 172 side which need access on 192 side, vice versa

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