Crontab disables eth0 as I want, but eth0 restarts itself???

[netrace]

Hi all. Very newbish question here. I created the following crontab:

0 0 * * * /sbin/netdown
0 5 * * * /sbin/netup

netdown contains:

#!/bin/bash
/sbin/ifdown eth0

netup contains:

#!/bin/bash
/sbin/ifup eth0

Now, my question is, crontab runs the ifdown script and it works perfectly, but about a minute and a half later eth0 wakes itself back up. I want it to stay down until the netup script is scheduled to run. What is causing it to reactivate itself?

Thanks in advance.

[proprietarysucks]

various DEs have networkmanagers

check your services like:

chkconfig --list

see what network services are running. a program starting itself up is usually from a daemon which should be listed there and is most likely a networkmanager.

also in case you didn't know you can just put the command straight in cron