Re: No DHCP
 

zonealarm can mess things up if you 'improperly' remove software it's keeping an eye on. this can cause issues. second to that, if the zyxel is running a non-MS DHCP service, the DHCP discover message from the client can sometimes get confused by the DHCP service, meaning that the router can't give out the address correctly as it routes the return message to the wrong place.

try the following commands....


ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renew

---------- Post added at 20:48 ---------- Previous post was at 20:46 ----------

does sound likely to be a firewall thing though. try turning them all off and try again

Re: No DHCP
 

Nope - the other working PC is directly connected and I've directly connected the non working PC direct to the router with the same issue.

---------- Post added at 20:52 ---------- Previous post was at 20:50 ----------

DHCP message - without looking it's from DHCP Client saysing it could not obtain an IP address...

The other PC is working so I know the DHCP server is working correctly.

---------- Post added at 20:53 ---------- Previous post was at 20:52 ----------


Good shout on the commands - I've tried the ipconfig / renew etc but not the flush and register...

Firewall - the PC is running KIS2009 - and so is the working PC...

Re: No DHCP
 

That's just give me a thought.

Lee, the PC that's not working, it is using it's factory set default MAC address isn't it. You've not spoofed it at any point and duplicated it at all by any chance?

---------- Post added at 20:55 ---------- Previous post was at 20:54 ----------

Either turn it off.....and make sure it's off, or boot into safe mode with networking.

Re: No DHCP
 

Have you a spare NIC you could swap into the problem PC?

Re: No DHCP
 

i had a problem where DHCP kept dropping on my pc. Turned out to be Internet security messing with connection.

Re: No DHCP
 

Plot thickens....

Other wired PC's through the switch work correctly - they pickup a new correct IP.

It's something to do with my Vista install...

I've tried reseting the router - back to defaults - picked up an IP on the problem PC...cool...so went and changed the router IP from 192.168.1.1 to 192.168.10.1 and setup the DHCP server accordingly - start at 192.168.10.100 - pool of 100 addresses.

Rebooted problem PC - no IP again - switched on another wired PC - got an instant 192.168.10.100 IP address....

WTF is up with my Vista??!!

Could it be the original router I had was also set to 192.168.10.1 and Vista has remembered some settings for this?

Ran a Route Print but did not see the routes in the table....

What is going on!!!!

Re: No DHCP
 

http://support.microsoft.com/kb/928233

maybe..

Re: No DHCP
 

default gateway 192.168.1.1
from : http://www.dslreports.com/forum/r191...ction-problems

Re: No DHCP
 

Lee, you need to either try safe mode or another NIC.

also try DaiNasty's MS link, sounds relevent

Re: No DHCP
 

have you flushed and re-registered your DNS from the client yet?

Re: No DHCP
 

:D:D:D:D:D:D:D:D:D:D

Yay!!!!!! Fixed! Bloody Vista!!!

It needed that reg Dword added - DhcpConnEnableBcastFlagToggle and a reboot...

Thank's for the help all - for a moment I thought I had a duff On-Board LAN NIC...

Re: No DHCP
 

I'd wondered about the NIC as well but thought the reg hack was worth a try. Glad to hear it worked, I love a happy ending.

:)

Re: No DHCP
 

Well as I said - it worked fine with a static, so the hardware was ok - didn't work in Safe Mode /w Networking so we could rule out the firewall software - didn't work directly connected to the switch either so that ruled out the switch - it could have only been one thing....Vista's config.

Don't you just love troubleshooting!!! :rolleyes:

Actually - looking back at my work mail one of my colleagues had the same issues a few weeks ago and fixed it using the same reg key!

Re: No DHCP
 

And just as we're getting our heads around Vista, here comes Windows 7 with a whole new batch of headscratching built in..

;)