Terry

I'm not an expert and I don't know your particular router but if it is a NAT router (I assume it is if it has DHCP) it will be more difficult for an external hacker to get to your client PCs unless they have a Trojan in place. Newer routers also include more advanced firewall features like port blocking/management.

I grabbed a D-link Airplus router that comes with filtering and port controls. The wireless part is encrypted as well for max security. I feel reasonably safe with virus software and all incoming ports shut. You might also consider zonealarm which allows you to customise security for different sites (this one goes wonky if you mask ip header information or disable cookies, so I turn those off for UT) and warns you if evil critters try to send stuff out.

I assume you have no e-mail server or web server inside the router if your ip changes every 24 hours. If you do, look closely at your router port settings and the vendor's website for security updates. If not, close all incoming ports.

Take a look at grc.com to see what effect your router is having. Look at the manufacturer's website for firmware patches and updates/advice re security.

HTH

Regards

JR