So i just went through this entire article. It has been awhile since i have setup with linux but this tutorial was very well written.

I noticed in order for everything to work i needed to add these lines before the Exit 0 line in the iptable list

/sbin/iptables -P FORWARD ACCEPT
/sbin/iptables --table nat -A POSTROUTING -o eth0 -j MASQUERADE

and also the gateway didnt want to replicate out to the clients so i changed the order of option routers to just under the ddns update style...

ddns-update-style none;
option routers 172.17.207.121;

but other than that it is up smoothly... now i have to play around with IPtables to limit access to specific addresses...