Wrt54G2 issues

Hello:
 I have Wrt54G2 v1.5, I did latest code upgrade recently, and I still have two issues.
1) after code upgrade, I could use cisco IPSEC vpn, after I switch to Netgear wireless router, vpn is fine.
2) It has a lot of problem with Comcast scientific Atlanta DPC 2100 cable modem, the WRT54G2 can not get dhcp ip address, I tried release and renew several times, I will get public ip address if I am lucky.. 
It is very weird I have no problem with Netgear...
any solution?
~mike

Hi Mike
I have WRT54G2 V1 running off an Ambit cable modem and I have seen the same DHCP problems.  I was thinking of upgrading the firmwear but after seeing your post I don't think I will bother.
I seem to have fixed the issue by configuring a fixed IP for all the computers on my network and then disabling the routers DHCP server.
I think the only other option is to try the firmwear from DD_WRT

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    Littlelungs33
    Researcher
    Posts: 5
    Registered: 05-03-2009 
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    Microsoft Windows XP [Version 5.1.2600]
    (C) Copyright 1985-2001 Microsoft Corp.
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            Node Type . . . . . . . . . . . . : Unknown
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    Reply to previous message:
    toomanydonuts
    Network Administrator
    Posts: 5566
    Registered: 09-16-2006
    Are you trying to access 192.168.1.1  wirelessly?   If so, stop doing this.  Wireless access to 192.168.1.1  often fails.  Use a computer that is wired to the router when you want to change router settings.
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    2)  When you did the "IPCONFIG /ALL", was your computer wired to the modem with ethernet cable, or USB cable?
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                                        |--- wired computer
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    Wired computer connected to a LAN port on the WRT54G2, using ethernet cable.
    Nothing connected to USB port of Motorola Surfboard.
    Wireless computers connect directly (and wirelessly) to WRT54G2, not to your wired computer.
    Is above the way your system is setup?  If not, how is your system setup? 
    4)  Please clarify the problem that you are having.  Are you saying that your computer simply cannot access 192.168.1.1 , or that it cannot access the Internet, or that you cannot get any of your computers to access the Internet through the WRT54G2?    Are you trying to connect this computer by wire or wirelessly to the WRT54G2?
    5)  Can any computer access the Internet through the WRT54G2?
    Reply to previous message:
    Littlelungs33
    Researcher
    Posts: 5
    Registered: 05-03-2009 
    No, I'm trying to acess it through a wired computer. The computer I'm on right now is wired to the access point which is wired to the motorola modem. I can access the login page(as well as the internet) through the computer wired to the router(which, as stated just a few sentences ago, I'm currently using), but when i type in admin for the password it literally kicks me right back into the login screen with both username and password feilds blank. My entire system is setup the way you described that it should be ethernet cable and all. Trust me that was the first thing I checked. The IPCONFIG /ALL is the status of the computer wired to the router. The other two computers in the house (one is a laptop with wireless card and the other is a PC that I bought a wireless card for) cannot access the internet. They used to be able to until recently and I've made no changes to any of the settings.
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    Reply to previous message:
      toomanydonuts
    Network Administrator
    Posts: 5566
    Registered: 09-16-2006
    D)  Have you upgraded the router's firmware?
    E)  After the firmware upgrade, did you reset the router to factory defaults, then setup the router again from scratch?
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    G)  Have you been running unsecured wireless?   Or are you using encryption?  If you are using unsecured wireless, perhaps your neighbor logged into your router (by accident or intentionally) and changed your login password.
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    Reply to previous message:
    Littlelungs33
    Researcher
    Posts: 5
    Registered: 05-03-2009 
    My apologies for the delay in response, things have been hectic lately.  Alrighty, I did all that you said and here are some interesting results, I'll break down the results by each machine that a fiddled with:
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    -I got no response when trying to ping the router
    -Could not access the 192.168.1.1 configuration screen, not even the prompt for username and password
    -When using the installation disk AND the installation program i downloaded off the Linksys website it would not detect the router.
    Wireless Laptop(this is where i think it gets interesting):
    -I was able to fully install and automatically configure the router by using the installation disk
    -I could ping and get full response from the router both wirelessly and while it was directly wired to the router
    -I could also access the configuration menu 192.168.1.1 in my web browser
    -I also had a backup copy of the latest firmware for the router on my flash drive, so I updated the firmware through the laptop.
    -The laptop was using the router as it's access point, however the internet could not be found.
    If I wasn't at a total loss before I tried all this, I certainly am now. Could it be a problem with the network settings on the PC that is wired? Perhaps a faulty ethernet port? Your thoughts?
    Well, that's where it left off, I got no responses back from anyone after the last post. Help!!!

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