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Linksys WRT54G Problems, Help ASAP

M

melomania

Limp Gawd
Joined
Jun 16, 2005
Messages
266
Ok, I'll begin by saying that I am a networking major and I can't seem to solve this problem. I'll keep this as short as possible.

I have an Arris cable modem that connects to my Linksys WRT54Gv6, which is running a micro flavor of DD-WRT SP2. The Linksys router handles the wired/patched connections throughout the apartment and also transmits the wifi. I came back from this weekend and my roommate told me that our internet was messed up. I had a look and changed some things around to get it working again but the Linksys seems to be having trouble getting an IP address from the cable modem. If I reset both and wait a few minutes it might finally get a WAN IP then I can do whatever online until it suddenly stops working. I went to bed last night with it working just fine and now I can't even get my Linksys to retrieve an IP from the cable modem. The Linksys will give me and the rest of the computers IP's via wired or wireless no problem it just isn't communicating with the modem correctly.

I need suggestions.
 
*edit*
read all the post, this part was irreverent.
*edit*

You may want to reflash your dd-wrt build with the newest version available.
 
Have you tried hooking the modem up directly to one of the computers for a while to see if the same thing happens. If it doesn't happen, it's likely to be a problem with the router. If it does happen, the problem is likely with the modem.

If it looks like the problem is with the router, the WAN port on the router may be going bad. You could test this by disabling the router functions on the router and hooking the modem up to one of the regular LAN ports. One of the computers should be able to connect to the modem through this since it's just acting as a switch or a hub. If you don't have any problems with it hooked up this way, it's likely the problem is the WAN port on the router. As suggested, you might try reflashing the router with newer firmware, but if there were no problems before and nothing has changed, I think it's more likely it's a hardware rather than software problem.

Also, have you tried a different networking cable from the modem to the router? If there is something wrong with the cable, it could cause similar problems.

 
1. I did reflash to the newest firmware on my Linksys.
2. I did try multiple cables.

Okay, so a tech came out and he was cool about things. He tested the lines and modem and everything was good but he said because I tried pretty much everything he'd make up something and give me a new modem anyway. He also said that sometimes the routers and modems have trouble getting an IP and you have to give them a few minutes so I've been patient and gave them both a few minutes to assign IP addresses.

After he left everything was fine until a few hours later when my internet suddenly got uber slow and disconnected. I said to hell with my Linksys and plugged in the Netgear and it worked fine. I woke up this morning and I couldn't connect to my Netgear for whatever reason and had to reset it but now it works. I do not understand why all of the sudden I must perform all of this maintenance? I should not have to reset everything every couple hours.
 
From experience, power problems could be causing some of your issues.

Home grade hardware is not very tolerant to power sags and I have found it to cause problems such as not getting an IP or causing various problems that require a power cycle.

First though I would test the micro version of Tomato firmware just to make sure it is not DDWRT.

Next get a good UPS for your networking equipment, which IMO you should already have.
 
You make a good point, it could very well be a power issue. My roommate hasn't hooked up the UPS he has yet so I'll try that next.

As for my router. Here is some info:

Model: Linksys WRT54G v6
Firmware: dd-wrt v23 SP2 MICRO

I have downloaded Tomato 1.14 but the router rejects it. PS. I am using the firmware upgrade option that is available in dd-wrt. It says the firmware was upgraded successfully but just returns to the dd-wrt menu. What tips do you have for the upgrade?
 
This is what I would try and in this order.

1. Set the mac address on the linksys to the mac of one of your pc's. I had to do this for mine other wise the cable modem wouldn't give it an ip. I think its because when you flash the router it gives it some generic mac address from dd-wrt so the cable modem probably doesn't want to give it an ip.

2. If that doesn't work try the rc5 micro build, I'm using it and no problems so far. Don't use the rc6 just to buggy. Infact sp2 didn't work very good for my version 6, rc5 is much better for me.
 
I stated it before, your best bet is to hook the modem up directly to one of the systems and see if the problem still happens by bypassing routers. If it does not happen, then you know it's a problem with one or both routers. If it does happen, then it's a problem with the ISP or as someone said, a problem with power.

You might want to try 192.168.100.1 and see if that will allow you to see the diagnostic and event log of your modem. There may be something in there which may give you a hint in the right direction.

 
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