I had a strange thing happen yesterday
I my ISP DNS didn't appear to be working
I couldn't get online until I tried using an IP address

so I added a static DNS to my router and I was back surfing again.
but when I added the static DNS to my third DNS and saved it
it was listed as my primary.

Also about six month ago when I moved my website
it took a while before I could access it
my server said it takes awhile before all the DNS servers get updated.

so know I'm wondering what is the best way to add extra static DNS addresses for back up.
In case of problems or even to get the best access to the web.