Cron Problem !!!

lionking_x · 12-13-2004, 10:23 AM

Hi ALL ,

I was doing a practice exam for RHCE , and one of the questions was

"Set up networking only during working hours ( 8:00 AM to 5:00 PM) "

How can i do this ? there is no more explanation given . The author of the exam says that
"You can limit networking to working hours using appropritae cron jobs from /etc/cron.daily"

Any ideas ??

thanks

adamwenner · 12-13-2004, 10:35 AM

i would use crontab to do it

this should help you

http://www.adminschoice.com/docs/crontab.htm

good job on the RHCE, im only an RHCT, hopefully someday ill be RHCE, then again, im only 18

ttyl

--adam

lionking_x · 12-13-2004, 10:45 AM

Hi
i have used crontab for many other tasks ,
WHAT do i SPECIFICALLY do to disable networking ??? some service ? can you be more specific please ?

thanks for your help man ,

Quote:

Originally posted by adamwenner
i would use crontab to do it

this should help you

http://www.adminschoice.com/docs/crontab.htm

good job on the RHCE, im only an RHCT, hopefully someday ill be RHCE, then again, im only 18

ttyl

--adam

lionking_x · 12-13-2004, 01:13 PM

OK OK , can i use iptables , but i think this is not the rightway to get to it though ,

Write a shell scripts to disable my output policy say at 8 am,

"iptables -P OUTPUT DROP "

and then enable it back at 5pm

"iptables -P OUTPUT ACCEPT"

I can have two crontab entries to do this, one at 5pm and the otherone at 8am.

I know this will work , but is there an easier way ??

Quote:

Originally posted by lionking_x
Hi
i have used crontab for many other tasks ,
WHAT do i SPECIFICALLY do to disable networking ??? some service ? can you be more specific please ?

thanks for your help man ,

visaris · 12-13-2004, 01:18 PM

I'm not sure about RedHat, but gentoo has some scripts in /etc/init.d.

I would do:

"/etc/init.d/net.eth0 stop"

and then

"/etc/init.d/net.eth0 start"

To take down and up the ethernet interface.

lionking_x · 12-13-2004, 01:42 PM

Hi ,

sure you can do this with redhat , you can disable the eth0 card , infact the entire "network" service which might involve all the network cards including the loopback card too, lo .

I sure thought abt this ,dont know why i did not use this solution , cant think of the reason now.

thanks , its a low grading question, so this must be it.

Thanks

Quote:

Originally posted by visaris
I'm not sure about RedHat, but gentoo has some scripts in /etc/init.d.

I would do:

"/etc/init.d/net.eth0 stop"

and then

"/etc/init.d/net.eth0 start"

To take down and up the ethernet interface.

adamwenner · 12-13-2004, 04:36 PM

service network stop will disable all networking interfaces