DHCP/NIC IP address contention issues

L Goodwin xrayv19 at yahoo.com
Thu Apr 26 06:12:46 UTC 2007

I'm pretty sure the XP box is configured correctly for DHCP (no static IP), but will check it again. 

By "check the lease information in the DSL modem", do you mean to see if the CM IP Address "Expires" date is earlier than current date? I unplugged both the modem and the router today before connecting the new FreeBSD box, so I assume that they are both "current".

I'll investigate/try all of the things you listed and see if anything turns up. I'll also check to see if /etc/rc.conf contains the following entry: 

Is there any way that the NIC on FreeBSD box could get configured multiple times (e.g., multiple entries in config files), and if so, could this cause this?

If the FreeBSD system were configured as a DHCP server (in addition to the router, which definitely is), what would you expect to happen? It shouldn't be, but what if it were?

Thank you!

Daniel Marsh <jahilliya at gmail.com> wrote: 

On 4/26/07, L Goodwin <xrayv19 at yahoo.com> wrote: Will someone please lead me in the right direction towards resolving the following network issue?

1) "Apr 25 13:33:19 SERVER kernel: arp 00:40:f4:47:fb:8e is using my IP address xxx.xxx.x.xx!" 
2) "dhcppc0# Apr 25 14:07:05 dhcpp0 kernel: arp: 00:40:f4:47:fb:8e is using my IP address xxx.xxx.x.xx!"

I ran "ipconfig /all" on both Windows boxes and found that the FreeBSD box is assigned the same IP address as the Windows XP box (which had that IP address FIRST). Why is the FreeBSD box being assigned a non-unique IP address? 

Have you checked the network properties (tcp-ip settings) for the XP machine to make sure it's being assigned a dynamic IP address?
Have you tried running ipconfig /renew on the XP machine? 
Have you checked the lease information in the DSL modem?

A DHCP server will not hand out the same IP address twice.
The only time I've seen something like this happen is when the DHCP lease times out for an IP and windows doesn't renew the lease on the IP, the IP is put into the free-ip's pool and handed out when the DHCP feels up to it... 
So if the XP machine is setup for DHCP, it got the IP via dhcp, it probably didn't renew the lease on the IP.

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