Just got Verizon DSL - Should I turn on Firewall?

I have a 2008 Mac Pro with Leopard and it's hooked up to Verizon DSL router/modem via ethernet. How important is Firewall? I have read some info about it, but I'm still not too clear.
Thanks!

Harden your router or switch. If you don't have a switch, get one. Then filter and block ports and services. Most recent routers have good firewall capability and can help prevent-block and alert you via email to intrusion attempts, remote login attempts, denial of service.
I never connect modem directly to computer. It also has ethernet go through 2nd surge protection (the modem has its own too).
And, I use Intego NetBarrier, which works alongside Leopard firewall to provide cookie, web filtering, and personal information and protection.

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