Re: IP conflict in my network
- From: nobody@xxxxxxxxxxxxxxx (Peter Boosten)
- Date: Wed, 6 Dec 2006 06:03:49 +0000 (UTC)
Spender <Spender@xxxxxxxx> wrote:
On 5 Dec 2006 02:21:31 -0800, "suad" <suad@xxxxxxxxxx> wrote:
some users have IP conflict. Ip address are destrubuited dynamicaly
by DHCP. why these users have this problem in my netwrok. do u think a
virous cause this problem. how can I prevent it.
A problem like this can be caused by the IP address lease running out, as
far as the DHCP server is concerned, while the system that owns the lease
is turned off. The DHCP server then hands out that IP to another system.
The first system is then turned on, and bing, bang, boom you have an IP
address conflict.
No, that should not cause any problems: if a device with an expired lease
is switched on, it does a DHCPREQUEST for its old IP, but the DHCP server
rejects if the IP has already been granted to another device. If the IP
address has not been given to another device, it'll deliver a DHCPACK.
I've seen several causes for this problem:
1. a PC with 'internet sharing' switched on will act as a DHCP server
2. I've seen (very long ago) a switch (Cisco IIRC) to assign IP addresses
to its own ports when given by a DHCP server
3. The pool is too small
4. like already suggested: someone is fiddling with fixed IP addresses
Peter
--
http://www.boosten.org
Mail: peter at boosten dot org
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