lost my DNS

[ManDash]

I was having issues being redirected from my homepage to random pages. I researched online and found that if I changed my DNS to 8.8.8.8 (i think it is google's) then it wouldn't be an issue. While that did fix the issue, my internet has slowed significantly and some pages won't load. I have a few questions:
1. How do I switch back to my old DNS?
2. Where do I find my old DNS?
3. How do I fix the rerouting issue associated with the old DNS without slowing my browser speed?

Thanks.

 

[maflynn]

For me, I just removed it completely and that stopped my usage of OpenDNS. That is if you're going to use something other then your ISP's then put a value in, if you want your ISP's default then leave it blank

 

[tug]

here give this a go;

http://www.macupdate.com/app/mac/32784/namebench

it might even significantly speed up your connection it did for me

 

[iThinksimple]

Ask DNS of your ISP, and change with your ISP DNS, or leave it blank for automatic DNS,