Win XP DHCP-server refuses to accept new dynamic IP-address from ISP

A

anders

I have a problem with Win XP SP1 (all current MS patches installed)
that I can't find any solution for.

I have a Netgear router (WGT624) between the Motorola Surfboard modem
and my computer (Celeron 2,4GHz). I also run the ZoneAlarm free version
as firewall on for some protection even if the router blocks all
intrusions.

My ISP changes the IP-address on the modem every now and then. This
requires my router/computer to follow as I have the DHCP-server
activated. The router follows and changes the address but the
DHCP-server does not accept the new address. Error messages like "Can't
clean the ARP-cache memory" and "Couldn't renew IP-address" is common.
The result is that I lose the connection with the network (both local
and WAN.) I regain the connection if I manually renew the IP-address in
the router.

I have re-installed the network cards software (3Com Gigabit LOM
(3C940)) and run the diagnostics as well. No impact.

Is there anyone that have suggestions on what I can do to solve the
problems with the DHCP-server?

Thanks in advance,
anders
 
R

Richard G. Harper

Unless I'm misunderstanding your configuration, you should not be changing
the IP configuration of your network every time your ISP changes your
outbound IP address. The router, if properly configured, should pick up
what it needs from your ISP and your internal network addresses should
remain the same.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
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A

anders

Yes, correct and that is also done. But the problem is that Win XP Pro
changes from "Assigned by DHCP" to "Private address" in the TCP/IP
config for the network bridge. I suspect that the DHCP-functionality is
not safe and does a little bit as it likes?

anders
 
R

Richard G. Harper

That doesn't sound like a Windows problem, it sounds like either a faulty or
misconfigured router. My IP address changes every 23 hours and 50 minutes
and I have never had the kinds of problems you're having. I would do a hard
reset on the router and take it back to factory settings, configure all PCs
for automatic IP and DNS addressing (DHCP enabled, in other words) and then
start re-configuring and securing the router once you have stabilized the
network as-is.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm
 
R

Richard G. Harper

The address you've quoted tells how to configure private addressing - not
DHCP. This is the address your computer assigns itself if DHCP fails.

You should probably try the advice I gave earlier.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm
 
T

Thomas Wendell

(Du kan få samma information på svenska om du vill...)

Your router and/or SurfBoard is misconfigured.
If the SurfBoard is a standard cable modem (?), you most likely can't adjust
it anyway, so we leave it aside now.
(Don't know if ComHem is only a cable ISP or if they also use ADSL)

On the Netgear router, you need it to obtain an IP-address by DHCP (for
itself), then have it act as a DHCP server to give a _different_IP-address
to your computer, ie. doing NAT/NAPT (Network Address Translation/ Network
Address & Port Translation)

Read the manual ( ftp://downloads.netgear.com/files/wgt624_ref_manual.pdf )
especially

Chapter 6: Advanced Configuration: Using LAN Setup Options: Using the Router
as a DHCP Server


And the computer of course should be set to obtain address by DHCP

--
Tumppi
Reply to group
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W

WayneM

Richard,

I've had a similar problem with DHCP since installing a Belkin router a
couple of years ago. It was setup using the Belkin wizard and we'll go
through periods of time when the router will not renew it's address. All the
LEDs on the modem and router indicate everything is functioning and the PC
indicates that we are connected to the Internet, but we can't surf. All we
get is 'page can't be displayed'. We have to unplug the router and modem for
several seconds, plug them back in and then we can surf the Internet again.

About a week ago I disabled the router DHCP server and manually configured
the router, but I must have done something wrong because the 'work off line'
window pops up whenever we've been off line for a few hours. It's no big
deal because selecting 'Try again' immediately re-establishes the
connection.

I've looked at some of the usual networking help sites but I don't see
anything that applies and the Belkin manual isn't any help either. Could you
suggest what I might have done wrong or where I might get help on manually
configuring the router?

TIA,

Wayne

Richard G. Harper said:
The address you've quoted tells how to configure private addressing - not
DHCP. This is the address your computer assigns itself if DHCP fails.

You should probably try the advice I gave earlier.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm


anders said:
Thanks for your info, but I have read on other subjects as well and it
seems that the DHCP is causing some problems for a number of users. I
have also in past fault traced in the router but no problems found.
I found this article at MS.com,
http://www.microsoft.com/resources/...Windows/XP/all/reskit/en-us/prjj_ipa_eiih.asp.
To solve the problem it looks that you have to fiddle with th
register...

anders
Click to expand...
Click to expand...
 
A

anders

This was exactly the symptom I had as well in the beginning. I could
get out on the net again if I made Release and Renew manually in the
router. Sometimes I even got the same IP-address from the ISP, but it
started to work.
It seems that the DCHP-server sometimes looses the DNS-server and then
swithces over to Automatic Private IP-address (I've seen IP 169xxxx...
at some occasions during my fault tracing. I guess Win XP is in the
background still searching for a DNS-server and when it finds it, XP
can't switch back to DHCP-mode. Is this maybe a bug that requires a
patch from Microsoft?

anders
 
R

Richard G. Harper

My first suggestion would be to try a different router and see what happens.
What you and anders are seeing are near-certain signs of a physical (not
software, hardware) network problem, a faulty router, or a misconfigured
router.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm
 
A

anders

Well, I have had 2 different ISP's (ADSL and Cable) - same problem. I
have run the network with and without router - same problem. I have
enabled and disabled the internal WLAN-card (can be both soft-AP and
WLAN-card) - still the same problem.
I have also run the system with different computers on W2000, but the
same effect, probaly as that computer only was connected on the router
and the troulesome was not disconnected.
Yesterday I re-installed all motherboard software including drivers for
the 3COM card (network bridge) and it seems to work for now. I also
flushed the DNS-memory and walked through the IPconfig-exe commands to
learn more about it. The system has been up and running now for 30
hours without any failure, so hope that service was what was needed.

At least I have learned a lot on this trip and would like to thank you
all for your support.

anders
 
W

WayneM

Richard,

Actually I've been thinking of going back to ICS. I'm getting up in years,
but I think the problem started when we went with the router. I don't
remember the problem when we were using ICS.

I went the router route because my wife was constantly having her problems
using a software firewall and we didn't have XP on her machine. Her machine
has now been upgraded to XP.

I know the XP firewall doesn't give the best protection but I haven't seen
any reports of the XP firewall being breached and I'm not all that concerned
about unauthorized outgoing traffic. I haven't checked yet but I'm assuming
ICS is still an option in XP.

Wayne
 
R

Richard G. Harper

IMHO, using ICS is a step backwards - but if it works for you and/or you
can't sort out the router problems that might be your best bet.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm
 

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