I am located in a large building. My company owns one side of the building while other small companies own the other side. My CEO wanted to sell some of the smaller companies our internet service since we have a full T-1 coming into our side and only about 50 users using it.
To set them up, I basically had them purchase a rounter and I plugged the router into my switch. They ended up purchasing a Linksys router since it was the cheapest one. The linksys external IP address matches my ip scheme (10.10.20.X), the internal IP address is 192.168.1.X. The router realeses DHCP for their computers. I also enabled NAT translation on my firewall so that they could have an external IP address. I just pointed the external IP address to the internal one that I gave the Linksys router.
My question is how secure is this set up?
What can I do to make it more secure?
Thanks for the help.