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Using Linksys router to add wireless to cable network

By steveavis ·
At home, I'm happily running 2 computers connected together with a switch and connecting to the internet through a Motorola SB5110i Surfboard cable modem.
We've been given a laptop and a Linksys WRT54Gv2.2 wireless broadband router with 4 port switch, and I thought it would be nice if I could use it as a replacement to the existing switch (it's a Linksys BEFSR41 (now I read the label on the back, it's also a router with 4 port switch!)) but with the added benefit of giving the laptop wireless access.

Unfortunately, it doesn't work.
It's nothing to do with MAC addresses.

Apart from that, I'm stumped. I've tried turning off the DHCP server on the modem, thinking that there was a conflict between it & the router, but that didn't fix anything.

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configuration

by SundayBiker In reply to tried

Dude, disconnect your linksys form the modem for now and set it up as DHCP server(enable dhcp) and set your PCs to Auto configuration. then do an ipconfig /all on your PC and it shouls show 192.168.1.1 (assuming that's the Lynsys' IP) as Gateway and DNS server and the host should be 192.168.1.102 or something. Once this part works set up the modem to work as a modem only, disable dhcp, dns or anyhing else on it. Make sure you have an Internet or DSL light on, meaning it receives signal. then connect the router to the modem and it should work. Some screenshots from the modem with ecerything disabled would help. If you can't make it work (it;s been 2 days already dude!) just go and get a cable or dsl modem (just the modem) that works with your ISP and it will work. Or just get a wireless modem+router that works with yor ISP, it's not worth spending your w/e doing this! Sorry for being so loud, but cummon:)

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Here's at least part of your problem....

by MGP2 In reply to tried

Default Gateway . . . . . . . . . : 82.36.208.1
DNS Servers . . . . . . . . . . . : 194.168.4.100
194.168.8.100


YOUR default gateway for your desktop and laptop is your router, 192.168.1.1. Also, I use my router's IP as my DNS server in my client configs. It's not really a DNS server, but it passes the DNS requests on to the DNS server of your ISP. But your gateway setting (on the clients), I believe, is definitely a roadblock.

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tried

by steveavis In reply to Here's your proof...

OK, I turned off DHCP on the modem, set the router back to 192.168.1.1, the desktop to 192.168.1.2 & laptop to 192.168.1.3.
Set evrything's subnet mas to 225.225.225.0 (apart from the modem, which I can't change) & copied the DNS Servers & default gateway from the desktop's configuration when everything was set by the modem

This is after all the changes (& the traditional turn everything off/on)-

Host Name . . . . . . . . . . . . : SNa123456789
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 3Com 3C920B-EMB-WNM Integrated Fast
Ethernet Controller
Physical Address. . . . . . . . . : 00-11-2F-08-04-B6
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 192.168.1.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 82.36.208.1
DNS Servers . . . . . . . . . . . : 194.168.4.100
194.168.8.100

(the laptop is identical, except for the IP address 0f 192.168.100.3)

--

This is the desktop when it worked (just desktop & DCHP on modem)

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 3Com 3C920B-EMB-WNM Integrated Fast
Ethernet Controller
Physical Address. . . . . . . . . : 00-11-2F-08-04-B6
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 82.36.210.231
Subnet Mask . . . . . . . . . . . : 255.255.248.0
Default Gateway . . . . . . . . . : 82.36.208.1
DHCP Server . . . . . . . . . . . : 62.30.192.114
DNS Servers . . . . . . . . . . . : 194.168.4.100
194.168.8.100
Lease Obtained. . . . . . . . . . : 09 August 2008 08:18:58
Lease Expires . . . . . . . . . . : 15 August 2008 00:22:03

--

Both machines can see both the router (on 192.168.1.1) & the modem (on 192.168.100.1).
Neither can see the internet.
Neither can ping the other one's IP address (I'm not sure that's relevent).


I've included 3 screenshots of the router's setup pages. You'll notice that on the router status page, there's no IP address. When I change the basic setip to static IP, I don't know what the internet IP is (surely it'll change everytime I turn on the modem (?).) & any changes I make to it tend to end in me being told that "value is illegal!". The other options are PPPoE, PPTP, L2TP & Telstra Cable, none of which seem likely, as they all require a password & username.


On the Advanced Routing page, if I change the settings to
Destination LAN IP : 192.168.100.1
Subnet Mask : 255.255.255.0 (or 255.255.248.0)
Default Gateway : 82.36.208.1

It returns the message "Invalid LAN IP or subnet mask!".

The Router setting on the advanced routing page was initally set to gateway, but I've changed that.

Images:
http://www.b3tards.com/u/f4ab7769a7adfa5fe1dc/router_status1.gif
http://www.b3tards.com/u/f4ab7769a7adfa5fe1dc/basic_setup1.gif
http://www.b3tards.com/u/f4ab7769a7adfa5fe1dc/advanced_routing1.gif
http://www.b3tards.com/u/f4ab7769a7adfa5fe1dc/basic_setup_static.gif - this is what the setup page for static IP looks like

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Don't bother with routing...

by MGP2 In reply to tried

That's only if you're going to have multiple networks. If there's an option to turn it off, do so.

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