should I use a firewall if behind a router

If the router is wireless, than I would say keep the personal FW as someone can hack the wireless and be all over the top of your machines hacking them wired or wireless, which you could block the IP they would be using from your router as the join your network with the PFW if that happens.

Why don't you just create a FW rule with the PFW to accept the traffic from the Device IP of the router? The machine cannot be attacked by the router. No one is going to use or can use the Device IP of the router to attack a machine on the LAN wired or wireless. The router is just trying to communicate with machines on the LAN.

Duane :)

Supplement a network-based firewall with a host-based firewall to protect from the following.

• uPNP-enabled router
• LAN hosts

That is IF he changed the Default user and password to the Netgear. before someone was able to gain access to it

:-)

Hi, Thank you for replying.

To Dom: don't need to protect from LAN hosts, unless my flatmate becomes a bad-hass :) the router is uPNP-enabled so yes, that's a good point.

To SecurityFreak: yes, you are right I should change the admin/password combination, this is not very clever ;)

To Duane: the router is wireless, but I'm connected via LAN as I don't have any wireless device on my PC. I'll try to create the rule, but I'm pretty sure I've done that before. When I was prompting about action to take when the router tried to access my PC, I set a rule and tick the 'always allow' box....

Thanx

Some times that works and sometimes it doesn't. I always set a custom rule for the PFW to accept the router's Device IP on all ports to stop the PFW solution from whining.

Duane :)