strange dhcp issues

  • Thread starter Thread starter Howard
  • Start date Start date
H

Howard

I have a question on dhcp. is there any logical reason why a computer
running windows xp will not pull an ip address when you restart? The only
way I have been able to get many of my clients computers to pull an ip off
their cable modem is to shut down the computer entirely and then reboot it.
This does not always work occasionally I need to reboot the customers modem
even when the isp says the modem is online and working. From my knowledge of
dhcp and tcp/ip there is no reason I can think of why I should have to do
this.Has any one encountered this problem? If so is there a fix?
Thank you
Howard
 
Howard said:
I have a question on dhcp. is there any logical reason why a computer
running windows xp will not pull an ip address when you restart? The
only way I have been able to get many of my clients computers to pull
an ip off their cable modem is to shut down the computer entirely and
then reboot it. This does not always work occasionally I need to
reboot the customers modem even when the isp says the modem is online
and working. From my knowledge of dhcp and tcp/ip there is no reason
I can think of why I should have to do this.Has any one encountered
this problem? If so is there a fix?
Click to expand...

You could try putting in the ISP's DNS entries manually and make the DNS
Suffix Search Order start with the domain of the ISP.

When you say restart, you mean IPCONFIG /RELEASE followed by IPCONFIG /RENEW
is not getting an IP from the DHCP server of the ISP? When you /RELEASE, do
you get a 0.0.0.0 IP or does it stay/become a 192.168 or other IP?
 
when I try to manually do the ipconfig it says it cant find the dhcp server.
They get a 169 ip. The isp only uses dhcp so I don't have much to put in
Howard
 
Howard said:
I have a question on dhcp. is there any logical reason why a
computer running windows xp will not pull an ip address when you
restart? The only way I have been able to get many of my clients
computers to pull an ip off their cable modem is to shut down the
computer entirely and then reboot it. This does not always work
occasionally I need to reboot the customers modem even when the isp
says the modem is online and working. From my knowledge of dhcp and
tcp/ip there is no reason I can think of why I should have to do
this.Has any one encountered this problem? If so is there a fix?
Click to expand...

Shenan T. Stanley said:
You could try putting in the ISP's DNS entries manually and make the
DNS Suffix Search Order start with the domain of the ISP.

When you say restart, you mean IPCONFIG /RELEASE followed by
IPCONFIG /RENEW is not getting an IP from the DHCP server of the
ISP? When you /RELEASE, do you get a 0.0.0.0 IP or does it
stay/become a 192.168 or other IP?
Click to expand...

Howard said:
when I try to manually do the ipconfig it says it cant find the dhcp
server. They get a 169 ip. The isp only uses dhcp so I don't have
much to put in Howard
Click to expand...

Okay - I have seen this happen on my cable modem setup whenever the Cable
Services DHCP service is having issues and/or my connection (network card,
cable to modem/switch, etc) is bad. As you are getting a 169 IP, that means
INTERNAL - XP made it up. I would check the cables and have the cable
company come out and check the lines to their cable modem and do noise
tests.

You can get the DNS information if you can get an IP and go to a command
prompt and type IPCONFIG /ALL. It should list the DNS information there,
just go into their network configuration and manually enter that either on
the first screen or by using the ADVANCED button. Don't enter the
IP/SUBNET/GATEWAY info, just DNS.. And the DNS SUFFIX Search Order you can
guess by their provider. For example, if it was COX Communications, it
would be cox-internet.com.
 
If it were a signal issue why would it pull the ip if I shut the computer
down and turn it back on? Most times that works but the computer looses it's
lease on the ip and I have to do this. If I do a simple restart I get no
place as I said I have to do a full shut down to get it to work.
Howard
 
Back
Top