Terry Pinnell <(E-Mail Removed)> wrote in
news:(E-Mail Removed):
> John Wunderlich <(E-Mail Removed)> wrote:
>
>> Terry Pinnell <(E-Mail Removed)> wrote in
>> news:(E-Mail Removed):
>>
>>> In Event Viewer I see many errors like this
>>> ---------
>>> DHCP
>>> "The IP address lease 192.168.x.xx for the Network Card with
>>> network address xxxxxxxxxx has been denied by the DHCP server
>>> 192.168.1.1 (The DHCP Server sent a DHCPNACK message)." [I've
>>> inserted the x's for security.]
>>> ---------
>>>
>>> Totally meaningless to me! Any of the experts able to help
>>> please?
>>>
>>
>> Is this a laptop that often moves from one network to another?
>> When contacting a DHCP server for an IP address, the computer
>> usually expresses a preference for the last IP address that it
>> had. If the DHCP server determines that that IP address is
>> currently unavailable or that the requested address does not
>> belong to the subnet served by the DHCP server, then you will log
>> the error that you cite in the Event Viewer. This is perfectly
>> normal and simply indicates that the "quick" DHCP assignment
>> failed and that the regular DHCP assignment process is being
>> forced.
>>
>> HTH,
>> John
>
> Thanks John. This is just a WinXP desktop PC, and I'm the sole
> user. The only 'network' is my BT Broadband connection and a cable
> connecting my old PC to my router temporarily, to allow copying of
> files. What and where is 'the DHCP server' that makes these
> choices please?
>
> Must say I do find this stuff very hard going! But if I've got the
> drift of what you're saying, then it sounds like I don't need to
> worry? Some 'lease' or other is not about to come to a sudden
> halt, excommunicating me (literally) from the Net?
>
The DHCP Server is the program that assigns you your IP address when
you connect to the network. If you connect directly to your
Broadband connection, the DHCP server is managed by your ISP. If you
connect to a router, then the router provides the DHCP function.
Connecting to a router, you usually get an IP address like
192.168.x.x. Connecting to your broadband, you would get a different
IP address. When your computer asks the DHCP server for an IP
address, it usually tries to take a shortcut by saying something like
"I need an IP address and, by the way, I'd prefer the last IP address
I had which was X.X.X.X" It would not be unusual for the DHCP server
to reply saying "I'm sorry but X.X.X.X is not currently available".
When this happens, you get the message that you see in your Event Log
and your computer will ask again for an IP address but this time it
will not express a preference.
When assigned an IP address via DHCP, there will be a time limit on
the use of this IP address. This is the "lease" time. Routers will
usually default to about a week, and ISPs will default anywhere
between a couple of hours to a couple of days. You can see your
lease expiration by bringing up a command window (start->run->cmd)
and entering the command: ipconfig /all
When the lease is half-over, your computer will automatically attempt
to renew the lease. It is rare for a lease not to renew; however,
should it not renew before it expires, yes you will be (as you put
it) excommunicated from the network. The main reason for the lease
is that should you drop off the network without formally releasing an
IP address, that IP address will eventually automatically expire and
revert back into the pool for assignment to another user.
HTH,
John
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