Do I need a firewall if I have a wireless router?

I'm using Zone Alarm and also a Dell Truemobile 2300 Router. When I installed the Router I already had ZA so I left it there. You could go to this site and run Shields Up and Leak Test to see how well your router is protecting you. If you're not visible to the world then you don't need a software firewall.

http://grc.com/default.htm

From a pinned thread on the "First Time Users" board.

"If you are behind a router, you are safer, as the NAT feature of the router will discard all unsolicited traffic that arrives. However, it does not completely protect you, as trojans and other things can still get out. Some routers, like the TM2300, include a built in firewall. I have a belkin router that has a pretty capable firewall. Check with the maker of your router to see if it has a firewall."

I run NIS 2003 behind my Linksys wrt54g router.

Marc

Dimension 8200: Intel P4 3.06GHz w/HT enabled, AO9 Sponged BIOS, 1.5GB PC800 RDRam, WD 80 GB (7200 RPM) ATA primary HDD, WD 160GB (7200 RPM) ATA secondary HDD, Dell 1800FP, 128MB ATI Radeon 9700 PRO w/TV out, GVC-REALTEK Ethernet 10/100 NIC, Conexant HSF V92 56K Modem, Samsung 16x DVD-ROM, NEC 4x DVD+R/RW CD-RW, TEAC 1.44M 3.5in Floppy, HK 695 Spkrs., Turtle Beach Santa Cruz, OfficeXP Pro (added), WindowsXP Pro

Having a router always helps & is much safe but a 3rd party firewall (software) is always recemmended.

Firewalls like zone alarm wont keep a track of stuff like keyloggers....I have used almost all firewalls & the best is  Norton Personal Firewall.....You can get a trial version of it & try.....It beats any firewall by farrrrrrrrrr !!!!