Just in my personal experiences I have never had to set up the DNS and as far as the address for the dhcp server, I always set mine to match the fog address, it works for me. As far as having your fog server on a laptop, you are going to have to run a couple of different commands in the terminal every time you turn on the laptop…

[CODE]sudo stop tftpd-hpa
sudo start tftpd-hpa[/CODE]

this is all going off of my head, try it and see if you have any luck

easy way of finding default gateway and subnet mask is to set the workstation to dhcp - wait until it gets and ip address - fo to the information - note down the dg and subnet - pop out to a terminal try pinging and address up the top or down the bottom of the ip range (to find out a address that hasn’t been allocated out) find a non responding address and use that along with the dg and subnet mask details… most if not all subnet masks will be 255.255.255.0 …