From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tomasz Korycki <engine2@flow.mine.nu>
Subject: Re: ff:ff:ff:ff:ff:ff mac problem
Date: Sat, 26 Jun 2004 11:45:28 -0400
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To: jnsolanki@d2visp.com
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At 03:45 2004-06-24, joel solanki wrote:
>Hi all,
>
>I am having problem in my linux server.
>I am using redhat 9.0 with default iptables rpm.
>I have Nat of this server.
>ff:ff:ff:ff:ff:ff This mac address is creating problem in my network.
>Coz i cant find the ip address  of this mac address device.

FF:FF:FF:FF:FF:FF is defined as an invalid MAC address. When hardware goes 
belly-up, it is (supposed to) identify itself so, so that:
1. it does not duplicate any existing MAC
2. it is obvious enough to be immediately recognised as indication of a problem

In other words: most likely You have a dead NIC on Your ethernet.