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Forum Discussion
DHCP Not working
My once fine-working cable modem has randomly stopped assigning IPV4 addresses to all of my devices. IPV6 is on auto-assign and works fine. I verified that IPV4 is set up for DHCP, but none of my d...
> Re: DHCP Not working
How do you know that the fundamental problem is DHCP, and not, say, a
totally broken connection? As usual, showing actual actions with their
actual results (error messages, LED indicators, ...) can be more helpful
than vague descriptions or interpretations. What observations, exactly,
led you to this "DHCP Not working" conclusion?
Do the LED indicators on a wired connection (both ends) always look
good?
If you have a computer with a suitable static IP address (so that it
doesn't need DHCP from the router), preferably wired, can you always
talk to the router's web site?
Many things can leave a computer/device without a good IP
configuration. A bad DHCP server is only one of them.
> I disabled DHCP, rebooted, enabled it, rebooted again and now it's
> working.
How much of all that necessary? Will a simple reboot do the job?
Depending on how deep you want to dive, it may be possible to probe
the operation of the router at a lower level. There are various
programs out there which may be able to enable a Telnet (command-line)
interface to many Netgear routers. (I use the program which I modified,
http://antinode.info/nte , but others are available). Around here
(D7000, V1.0.1.54_1.0.1), for example, I can see if the DHCP server is
running:
# ps | grep -i dhcp
1152 root 704 S /var/udhcpd_1 /etc/udhcpd.conf1
[...]
That doesn't prove that it's working, but if it died, then that would be
detectable and interesting.
My issue has been resolved. I called my ISP and had them push a firmware update through and the problem was resolved.
I knew it was a DHCP issue because with DHCP I was only getting an APIPA ip address but if I set a static IpV4 address I was able to communicate to the internet. I also knew because I had an IpV6 address through stateless auto-configuration which also could communicate to the internet. If it was a simple connection issue I wouldn't have been able to have successful communication through either of these protocols. The issue was most definately DHCP not assigning addresses.