DNS Resolver Problem

[linux quest]

I have a problem with the DNS setting in FreeBSD. Every 1 hour, I will not be able to ping google.com (because I need to type in my ISP's DNS into /etc/resolv.conf) May I know what is the best solution for this, so that I do not have to type in my ISP's DNS to the resolver all the time? Perhaps, should I set a static IP configuration? If so, may I know which file should I modify? 

Thanks.

Regards, 
Linux Quest
 
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