DHCP/NIC IP address contention issues

L Goodwin xrayv19 at yahoo.com
Thu Apr 26 06:14:56 UTC 2007

I'll double-check the things you listed. If you can tell me what additional info I need to supply and where to get it, I'll be happy to oblige. Thanks...

Beech Rintoul <beech at alaskaparadise.com> wrote: On Wednesday 25 April 2007, L Goodwin said:
> Will someone please lead me in the right direction towards
> resolving the following network issue?
> I just added a FreeBSD server to a LAN that consists of a router
> and 2 pc's, one of which is running Windows XP Pro and the other
> Windows Vista. The lan is connected to the Internet via a cable
> modem that goes through the router. The router is set up to be the
> DHCP server. Now it is being assigned a non-unique IP address.
>  Before adding the FreeBSD box to the mix, everybody was getting
> along fine (unique IP addresses were dynamically assigned to the
> pc's).
> I connected the FreeBSD box to the router, selected "Configure
> additional network interfaces" from the sysinstall menu, selected
> "fxp0 Intel EtherExpress Pro/100B PCI Fast Ethernet card" from the
> top of the list and clicked "OK" to prompts to try to configure
> IPv6 and DCHP. When done, the Network Configuration dialog
> contained the following values (which I did not alter):
> Host: dhcppc0
> Domain: (the cable provider's domain name)
> IPv4 Gateway:
> Name server: (IP address of ISP's name server)
> Configuration for Interface fxp0:
>     IPv4 Address:
>     Netmask:
>     Extra options: (blank)
> Note that the Host field does not match the hostname of the FreeBSD
> box, which is named "SERVER" (real creative, huh?). I guess I
> should have changed the Host field to "SERVER", eh?
> Then I got the following console messages on the FreeBSD server:
> 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?

1. Check that your router's dhcp server is set up properly.

2. Check that the windows box is not set up with a static ip. The box 
could be hard coded to an ip address and your dhcp server thinks the 
lease is free.

Other than that you need to supply more info.


Beech Rintoul - Port Maintainer - beech at alaskaparadise.com
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