Convert Linksys BEFW11S4 into an access point

Linksys / Befw11s4
February 15, 2010 at 09:01:17
Specs: Windows XP
First off, I used the search feature, I swear! It's been asked and answered a hundred times, and I even understand the answers, but I'm having no luck.

First, the problem: I am getting IP Conflict errors 5 or 6 times a day, sometimes more. I Do not have DHCP servers running on any of the computers on the network. So I figure my wireless router (Linksys BEFW11S4 w/ 4 point switch) is a bit flakey with it's DHCP. So I think, "Hey, I know... I'll just dig up that old Linksys router (BEFSR11), disable the DHCP on the BEFW11s4, and let the the old BEFSR11 handle all that...."
So here's what I did...
Step 1) I changed the BEFW11S4 IP address to 192.168.1.10, and disabled the DHCP server. No other changes.
Step 2) Then I logged into the BEFSR11 (192.168.1.1) and made sure the DHCP server was enabled and that it began handing out IP's starting at 192.168.1.100.
Step 3) I Plugged my cable modem into the WAN port of the BEFSR11.
Step 4) Patched the BEFSR11 LAN port to one of the BEFW11S4 LAN ports.

Re stared the whole mess, fail. Restarted the computer, fail.

I was able to access the BEFW11S4 at 192.168.1.10, no problem. Accessing the BEFSR11 at 192.168.1.1 was hit or miss. Sometimes it would time out, other times the page would load half way. But usually not at all. (Timed out). And the internet was not available at all.

Any thoughts? Please note that I am not attached to the idea of using separate gateway/router/DHCP appliance (the BEFSR11). I just wanna fix the IP conflict problem, and if doing the above can fix it, then great. But if you have other ideas on how to fix the IP conflict problem, please share.

Some more details:
The wireless router (BEFW11S4) has the most recent firmware available, unsure if the BEFSR11 firmware.
The BEFSR11 works just dandy if I go thru an old crappy 10BASE-T Ethernet hub (a Netgear EN104tp), so I assume it works as well as it did the day I stowed it away.
The computers: An XP Pro desktop and an iMac running OSX (10.4). These two computers are cabled to the internet (not wireless)...
A laptop running XP Pro (Wi-Fi connected)
And finally, 2 iTouches (iPod Touch) that connect via Wi-Fi.
I beleive the ip conflicts occur most often when the wireless devices are connected or connecting.

Thanks for reading and for any suggestions.


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#1
February 15, 2010 at 09:20:07
post the results of an ipconfig /all from the machine reporting the ip conflicts

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#2
February 15, 2010 at 09:26:29
Sure, but it may take a while. See, this most often happens while I 'm away and the wife and kids complain about the error. They have learned to fix the problem by resetting the wireless router.
But when I grab the output I will post it. Anything thing I should be looking for?

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#3
February 15, 2010 at 09:56:27
regardless of the error post the ipconfig /all from any of the machines reporting the error. Need to review your workstation ip setup.

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#4
February 15, 2010 at 10:27:16
Thanks for your help. Here is the output:
ipconfig /all results fro desktop running XP Pro

Windows IP Configuration

Host Name . . . . . . . . . . . . : UPSTAIRS
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : gha.chartermi.net

Ethernet adapter Local Area Connection 2:

Media State . . . . . . . . . . . : Media disconnected
Description . . . . . . . . . . . : NVIDIA nForce Networking Controller
Physical Address. . . . . . . . . : 00-0C-6E-63-63-BC

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : gha.chartermi.net
Description . . . . . . . . . . . : 3Com 3C920B-EMB Integrated Fast Ethernet Controller
Physical Address. . . . . . . . . : 00-26-54-0E-78-0D
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.101
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 24.247.15.53
24.247.24.53
Lease Obtained. . . . . . . . . . : Monday, February 15, 2010 1:09:30 AM

Lease Expires . . . . . . . . . . : Tuesday, February 16, 2010 1:09:30 AM

**********************************
**********************************

ipconfig /all results from laptop running XP Pro

Host Name . . . . . . . . . . . . : jj-lappy
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Mixed
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : gha.chartermi.net

Ethernet adapter Wireless Network Connection:

Connection-specific DNS Suffix . : gha.chartermi.net
Description . . . . . . . . . . . : Dell Wireless 1350 WLAN Mini-PCI Card
Physical Address. . . . . . . . . : 00-90-96-F8-92-AC
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.103
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 24.247.15.53
24.247.24.53
Lease Obtained. . . . . . . . . . : Monday, February 15, 2010 1:19:00 PM

Lease Expires . . . . . . . . . . : Tuesday, February 16, 2010 1:19:00 PM


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#5
February 15, 2010 at 10:45:56
Every thing looks good. DHCP is getting to wired and wireless clients. Routers are at .1 and .10

One day leases are a bit short but that should not cause a conflict.

Usually you get an ip conflict message it includes the mac address of the other assigned device. Note that mac address so we can then track which device is causing the conflict


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#6
February 16, 2010 at 05:50:21
Usually you get an ip conflict message it includes the mac address of the other assigned device. Note that mac address so we can then track which device is causing the conflict

Check Event Viewer for the error with MAC address. I forget which section it's in but I can tell you it's not "Security". I think it's in "Application" but it could be "System" so check both. Just look for the errors and open them and read.

Once you have the MAC address, just check all your PC's by using the ipconfig /all command again. If it's not a PC or laptop, check the router's MAC addresses.

Typically when using DHCP and you get an duplicate IP error, this is because you have something with a statically assigned IP address. So if you do have some static IP's in your LAN, check those and ensure none of them are within the scope of your DHCP server (typically 100 to 199 on most SOHO routers).


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#7
February 16, 2010 at 20:26:52
Thanks for the help folks,. I will take the advice.
And thanks for the heads up on the event viewer. I'd forgotten about that thing :-)

Will work on it some more this weekend.

Thanks for the help. I think you folks have put me on the right track.


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