Posted: Wed Jan 27, 2010 4:17 Post subject: WHR-G300N WAN will not get DHCP from modem
I cannot get my WHR-G300N to recognize my modem and get a DHCP address from it. I tried a few different firmware revisions but none seem to work. I know its not a modem problem. I have tried other routers and my computer with no problem. Does anyone know how to fix this?
Joined: 10 May 2008 Posts: 1380 Location: Pacific North West, USA
Posted: Wed Jan 27, 2010 12:44 Post subject:
Who is your modem provider?
Have you power-cycled your modem?
Unplug the power to the modem & your router for 5 minutes.
Check to see if your modem has a battery backup - some newer ones do.
Power Modem on first, then Router after a couple minutes.
See if it gets an IP address.
Check the main Sys-Info page WAN sub-tab to see if it got a DHCP address from your provider. _________________ Soylent Green Is People ! =-=-=-=-=-=-=-=-=-=-=
Netgear Nighthawk R7000 - DD-WRT Build R46220
Linksys EA8500 - OpenWRT IPQ806x Trunk R16375 5.4 Kernel
Posted: Wed Jan 27, 2010 15:18 Post subject: *Solved*
I am getting the same issue.
My provider is Charter Communications, I have attempted to reboot the modem, reboot the router, connected, disconnect WAN. Took about 15 minutes to get a new lease and then it disappeared about 10 minutes later.
Even tried to set it static and it would not hold the IP.
Using WHR-G300N with v24 preSP2.
Thanks!
Last edited by Jason1976 on Thu Jan 28, 2010 15:14; edited 1 time in total
Joined: 13 Nov 2009 Posts: 247 Location: Morehead,Kentucky
Posted: Wed Jan 27, 2010 15:21 Post subject:
Jason1976 wrote:
I am getting the same issue.
My provider is Charter Communications, I have attempted to reboot the modem, reboot the router, connected, disconnect WAN. Took about 15 minutes to get a new lease and then it disappeared about 10 minutes later.
Even tried to set it static and it would not hold the IP.
Using WHR-G300N with v24 preSP2.
Thanks!
Have you tried cloning your computers mac address, some providers won't work without doing it. _________________ Linksys E3000
DD-WRT v24-sp2 (12/19/10) big
(SVN revision 15943M NEWD-2 K2.6 Eko)
Posted: Wed Jan 27, 2010 17:57 Post subject: Re: WHR-G300N WAN will not get DHCP from modem
X7JAY7X wrote:
I cannot get my WHR-G300N to recognize my modem and get a DHCP address from it. I tried a few different firmware revisions but none seem to work. I know its not a modem problem. I have tried other routers and my computer with no problem. Does anyone know how to fix this?
I'm pretty sure you've run into a common bug with these routers. All the released version of DD-WRT wrongly set the WAN port address to the exact same MAC address. So basically Charter is rejecting your MAC address as duplicated. You can either clone your PC, your old router, or better yet manually type in the router number from the bottom of the buffalo (its listed as the default SSID)
Posted: Thu Jan 28, 2010 0:56 Post subject: Re: WHR-G300N WAN will not get DHCP from modem
KelleyCook wrote:
I'm pretty sure you've run into a common bug with these routers. All the released version of DD-WRT wrongly set the WAN port address to the exact same MAC address. So basically Charter is rejecting your MAC address as duplicated. You can either clone your PC, your old router, or better yet manually type in the router number from the bottom of the buffalo (its listed as the default SSID)
My MAC's are set correctly with, matching the ones on the outside of the devices.
However, when I got home, I was up and running with no issues. Might just take a bit for my ISP to sort things out.
Joined: 10 May 2008 Posts: 1380 Location: Pacific North West, USA
Posted: Thu Jan 28, 2010 7:20 Post subject:
Nice - glad to hear you got it working.
Can you edit your first post, the title/subject and add a *Solved*
That way no one resurrects this thread and they can also check it for info
if they happen to have the same kind of issue later.
Yes, more than likely Charter renewed the lease on the modem
and that in turn, renewed and got you a new IP address for the new MAC. _________________ Soylent Green Is People ! =-=-=-=-=-=-=-=-=-=-=
Netgear Nighthawk R7000 - DD-WRT Build R46220
Linksys EA8500 - OpenWRT IPQ806x Trunk R16375 5.4 Kernel
Soylent Green Is People ! 
=-=-=-=-=-=-=-=-=-=-= 
