Or you could have powerline issues. It's happened to me before.

Lee Sharp wrote:
> From: "control alt del" <controlaltdel at control dash alt dash del dot net>
>
>> Some time ago, I send to list my problems with m0n0.
>> Last month, I change my m0n0wall box.
>> now I run m0n0 with a P III 733mhz with a asus cuvx4 board,
>> 128mb ram and 3 intel pro 100 nics.
>> I run m0n0 with a hard drive.
>> Unfortenatly, the luckups continu to ocure, about 15 days of up time.
>> I run dnsforwarder, dhcp server, traffic shaper, and about 20 firewall
>> rules. My internet connection is PPPOE. when the luckup ocure the
>> box don't respond to keyboard.
>> In my opignion  the problem is an software issue, because the
>> hardware is completely diferent than I used.
>
> Capture and save a status.php page every day starting from a fresh 
> reboot. When you get the lockup, compare and see what is growing.  You 
> could have some dirty traffic on your LAN.  I had a client PC 
> requesting DHCP every 8 seconds once.  Ran fine until I had a heavy 
> load.  Then it got ugly quick.
>
>                        Lee
>
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-- 

Alex Neuman van der Hans
N&K Technology Consultants
Tel. +507 214-9002 - http://nkpanama.com/