DNS address same as my gateway address

[comp builder]

I have assigned my xbox 360 a static ip address so i can port forward to that address, anyway i was bored so i thought i would make all the computers in the house static ip.
I went into 'command' to find out my ip address (i typed in ipconfig /all) and i noticed that i had only 1 DNS address and it was the same as the gateway address (192.168.1.1). I looked this up on google and apprently it means that the DNS is 'caching' off the gateway.
I'm not too sure what this means, but i think it means it's taking up speed. So is there anyway to change my DNS address? or dosn't it matter?

also in my router there are 2 DNS addresses and they are 91.x.x.x, however when i type these in the internet dosn't work???


one last question lol
is there any point in me assigning static ip's to my computers or does it make me more vunerable to hackers?
what i mean is once they ip scan and find my address with it being static they can just keep coming back to it

 

[comp builder]

i'm with orange broadband. I know everyone thinks they're crap but to be honest i don't have a problem with them. I have the 8mb one, although i'm only getting 4mb but as i understand that is a hell of a lot from orange. On top of that i got a £430 laptop for £70 (i joined the offer ****** were making)

I think i may just leave it as is. With all the people complaining i'm beginning to wonder wether they are using orange DNS servers instead of the router acting as a DNS server


Thanks for all the help so quickly guys, thats why i love this forum