Re: IP address change

From: Bob Willard (BobwBSGS_at_TrashThis.comcast.net)
Date: 11/20/04 

Date: Sat, 20 Nov 2004 08:28:55 -0500

barrowhill wrote:

> Thanks for quick reply. I'm no expert so please bear with me.
>
> This is a home wired network. The (gateway) PC connected to the internet
> (cable Broadband) is in the dining room. There are three further (client)
> PC's upstairs in bedrooms.
>
> This network has been running for a min 2 years. Until today, I've had all
> three (plus laptop) connected to internet, all auto (DHCP) configured
>
> So, if I understand correctly, two of the three were able to find DHCP
> server to obtain an IP address. The third could not, so it used APIPA to
> auto configure itself (though still without success)
>
> Because it still couldn't connect to internet, I presume this was because
> the default gateway address wasn't found/set (as shown by ipconfig). Manual
> config therefore being only option.
>
> I still don't undertand why no longer working when it has been for some
> considerable time. At this moment the other two PC's are DHCP
> configured/connected to internet, this one manually configured/connected, so
> doesn't appear to be connection or DHCP problem (??). Is it possible that I
> have file corruption somewhere on this PC??
>
> "deck4" wrote:
>
>
>>The 169.X.X.X address you received is an APIPA address. This means that when
>>your computer reconnected it was not able to receive an IP address from the
>>DHCP Server. Possbile cause could be that there were no available IP address
>>leases left in the DHCP Servers IP address pool. Check with your admin to
>>see if he needs to add more IP addressed to the pool. Usually when you
>>receive an APIPA address, there is a connection problem or a DHCP Server
>>problem.
>>
>>"barrowhill" wrote:
>>
>>
>>>Earlier this evening whilst on the net, I lost connection. This was noticed
>>>when my LAN notified me it had reconnected. I could not get back on the
>>>internet. Investigation (ipconfig) found that my IP address had
>>>dramticatically changed from 192.x.x.x to 169.254.155.65, with no default
>>>gateway setting. Obtaing IP address automatically no longer working (??).
>>>I've had to set up manually to reconnect. Can anyone tell me what's happened
>>>???? and why ???
>>>
>>>I'm using firewall (SP2 and Panda) and AV. Everything is upto date.

I assume that when you say gateway you don't mean a Gateway-brand PC but do mean
a PC with two NICs, one tied to a cable modem and one tied to a hub/switch to
which the other PCs are tied, and that the gateway PC runs ICS and is the
DHCP server for your LAN.

With that assumption, there is nothing wrong with the gateway PC because it
is correctly handing out IPAs to other PCs on your LAN. On the sick PC, start
by turning off all firewalls and AV apps, then manually assign an unused IPA in
the 192.168.0.2-192.168.0.99 range, then Run CMD and type PING 192.168.0.1 in
the CMD window. If PING works, then DHCP should also work and I'd suspect a
firewall was misconfigured; if PING times out, then I'd suspect a hardware
failure (bad/loose cable, bad hub/switch port, bad NIC) or a corrupted network
stack. 

-- 
Cheers, Bob

Relevant Pages

  • Re: D-Link Modem Not Working With One Computer
    ... defaults to when it cannot connect with the dhcp server. ... You say the settings are the same on the working and not working ... Networks" in Network Connections, but what is strange is that my ISP told me ... Control Panel: Network Connections: Wireless Network Connection: General ...
    (microsoft.public.windowsxp.network_web)
  • Re: VPN and remote gateway
    ... 317025, we could know that if you use local gateway, your internet connection will not be a problem, but, you could not access your ... remote network since there is no route between you computer and your remote company network. ...
    (microsoft.public.windows.server.sbs)
  • Re: Network connected but no IP address
    ... To make sure that the NIS firewall isn't blocking the gateway ??router??, open NIS and add the gateway ??router?? ... To minimize any conflicts while working to resolve this issue Uninstall Any/All devices listed in Device Manager> Network Adapters. ... Shut down and remove the wireless NIC. ... What components/protocols are listed as installed in the NIC connection properties? ...
    (microsoft.public.windowsxp.general)
  • Re: Connect to Multiple Networks (Simultaneously) From Same Comput
    ... When you are not connected to the secure dial-up, ... When you connect to the secure network, I bet their DHCP server (or their ... remote gateway of your dial-up connection, ...
    (microsoft.public.windows.server.general)
  • Cable Connectivity
    ... address for the Network Card with network address 00402B2F688C. ... The DHCP Client service on your computer did not receive a response ... If connection with the network is not established using this APIP ... the DHCP Client service will try to contact the DHCP server ...
    (microsoft.public.windowsxp.general)
Quantcast