Firewall compatibility

Dakota_37 · Post by **Dakota_37** » Sat Jan 06, 2007 9:04 pm

I am wondering if a modem with firewall, router with firewall and a software firewall could create a conflict if running all at the same time. I have a ZyXEL Prestige 660 series modem, a Linksys WRT54G router and Zone Alarm all running at the same time. Could there be a conflict between the 2 hardware firewalls. Reason I ask is: When I go to grc.com and run a port test, it shows all ports as closed but not stealthed.

Post by **YeOldeStonecat** » Sun Jan 07, 2007 12:09 am

The Zyxel itself is a modem/router. It's the first device detected on your network. It may or may not have Ident port answering..which IMO isn't anything to lose a winks worth of sleep over anyways.

Curious why you also have a Linksys wireless router added to your Zyxel wireless router though..the Zyxel has the same NAT and wireless features already.

Dakota_37 · Post by **Dakota_37** » Sun Jan 07, 2007 1:24 am

I need the Linksys for more than one computer online.

Post by **YeOldeStonecat** » Sun Jan 07, 2007 10:47 am

Dakota_37 wrote:I need the Linksys for more than one computer online.

What version 660 do you have? You should be able to just connect a switch to it...most of the 660 models are already NAT routers that share the IP.

Having 2x NAT routers piggybacked isn't ideal, as you end up double-NAT'ing.

YARDofSTUF · Post by **YARDofSTUF** » Sun Jan 07, 2007 6:59 pm

YeOldeStonecat wrote:What version 660 do you have? You should be able to just connect a switch to it...most of the 660 models are already NAT routers that share the IP.

Having 2x NAT routers piggybacked isn't ideal, as you end up double-NAT'ing.

..Or couldnt he just turn off one of the NATs?

Dakota_37 · Post by **Dakota_37** » Sun Jan 07, 2007 7:11 pm

YeOldeStonecat wrote:What version 660 do you have? You should be able to just connect a switch to it...most of the 660 models are already NAT routers that share the IP.

Not sure what version the 660 series modem is, as it is from Embarq (formally Sprint) which handles my DSL connection. I wanted to also be able to use a wireless laptop with the Linksys.

YARDofSTUF · Post by **YARDofSTUF** » Sun Jan 07, 2007 7:19 pm

Oh and with a hardware firewall, get rid of ZoneCrap, if you really need a software firewall as well use the windows one or comodo: http://www.personalfirewall.comodo.com/

Dakota_37 · Post by **Dakota_37** » Mon Jan 08, 2007 5:17 pm

Okay one and all, I bridged the firewall in the modem and now I am stealthed.