Default Gateway Problem in multi router environment

I use leased line for Internet connectivity. I have a cisco 1601R router. I have no problems in accessing the Internet using this. However, there is no URL filtering feature with this router. Now I have connected and configured a Zyxel Prestige 334 Router for URL filtering. A cross UTP cable connects 10-BaseT port of the Cisco router to the LAN Port 1 of the Zyxle router. On my client computers, when I give the IP address of the Zyxel router as the default gateway, my client computers are not able to access the Internet. They are able to access the Internet only when I give the IP address of the Cisco router as the default gateway. What could be the solution to this? I want to use the URL/content filtering feature of the Zyxel modem in order to control the Internet access.

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Don JohnstonInstructorCommented:
Try this:

Internet--------- Cisco 1610R --------- Zyxel ------- Client computers

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Steven VonaCommented:
Two questions:
1) Does you Zyxel router how a WAN or UPLINKS PORT?  If so use those.

2) When you looks at the Zyxel router web interface, is it pulling valid IP info? (ip, subnet, gateway and DNS?)

3) Are you manually or statically configuring your clients or are they DHCP?  If they are DHCP what is the server?

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