Changing DNS server using Script, How?

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[adlesirc]

Hi all,

I want to know if it is possible to change the dns setting of WAN interface using script, because we implemented time based filtering on our office that during lunch break we allow social networking site. I decided to block https sites using content filtering of OPENDNS.

i need to make a schedule task using crontab command, that during lunch break my DNS of wan IP will change to default dns of our ISP..

My currently setup is in transparent mode

Any suggestions?

Criselda