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Public and private network on cable modem dynamic IP

Last response: in Networking
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March 3, 2012 9:33:33 PM

I've hit a brick wall mentally and need somebody to give me instruction sans educational verbiage. I have teenager, malware illiterate wife, and gamer tenants connected via 802.11 (Linksys WRT310n) to a Comcast dynamic IP cable modem (1 LAN port Arris unit). I need to access the internet but must be completely isolated from the aforementioned cesspool. I have various routers and switches available - thought I'd use a Netgear FVS318 for my gear.
Comcast ISP via the Arris modem is providing the Linksys WRT310n an Automatic Configuration - DHCP Internet Connection Data (currently): Internet IP 67.131.88.34, Subnet 255.255.248.0, Default Gateway 67.131.88.1, DNS1 75.75.75.75, DNS2 75.75.76.76, Domain Name "hsd1.comcast.net". The WRT310n has default LAN Data: DHCP Enabled, Router IP 192.168.1.1, Subnet 255.255.255.0, Start IP *.1.100, End IP *.1.149, WEP security, No SSID broadcast, MAC filter Access, Qos.

The Netgear FVS318 defaults to DHCP LAN on 192.168.0.1 with subnet 255.255.255.0.

QUESTION: Should I use two routers or three? If two routers, should Linksys or Netgear be first behind Comcast modem? Which router needs static route? What should the IP, Gateway, Subnet, and DNS be set to on the static route? and what should the IP, Gateway, Subnet, IP and IP range be set to on the Netgear?

I would really appreciate anyone that can provide me with the data I need to make this work - in a format that "a dog with a note in his mouth" could follow. Thanks in advance from Dumb-Dog!
March 4, 2012 8:30:29 AM

Start by disabling the DHCP on the netgear, more than one DHCP server on a network will cause naming conflicts.

Netgear:
IP address: 192.168.01
Subnet: 255.255.255.0
Default Gateway: 67.131.88.1
DNS1: 75.75.75.75
DNS2: 75.75.76.76

Your PC (Manual Setup):
IP Address: 192.168.0.2
Subnet: 255.255.255.0
Default Gateway: 67.131.88.1
DNS1: 75.75.75.75
DNS2: 75.75.76.76

This should work.
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