What is your dns1?
It's normally where you put your ISP's DNS number into, they usually have two.
It's short for Domain Name Server. It's what translates 188.8.131.52 for example into Netgears website url. So you don't have to remember the ip number for everyone on the web.
For example, OpenDNS has 184.108.40.206 as the primary and 220.127.116.11 as their second one.