Changes to network script

 - Dropped link speed
 - Added multiple address support
 - Added IPv6 support

I want to allow the user to scroll through the addresses or use other mechanics to rotate through each address. I just don't know what would be the most correct way to do this (exporting a variable just feels wrong). Ideas?

There are many tests here. Maybe this is enough:
```` bash
if test $speed -ge 1000
then
  speed="$((speed / 1000))Gb"
else
  speed="${speed}Mb"
fi
````