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ADSL router setup and hardware firewall

Hello Experts,

How should the ADSL router be configured working with hardware firewall behind?
As a router or the bridge?

We have simple Zyxel 660HW ADSL router connecting the small network to internet (PPPoA) and planning to put PIX firewall behind. Should we reconfigure router as a bridge? What about NAT? we don't need double NAT, so which one to keep?

Thanks for help
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I'd set it up as a bridge. The ADSL routers usually also include a firewall, and if it isn't setup in bridge mode that firewall can make things more complicated. As a bridge you can also forget about other setups, as it is then transparent.
DanbrascoAuthor Commented:
Will the firewall (Cisco PIX) work as a router then and do the routing?
I don't know the Cisco hardware, but most firewalls are also routers. If you can setup the ISP's login information (username/password) within the PIX then it'll do the routing.
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