Switching from FIOS to Comcast with 802.11n roaming network

Current FIOS setup.
FIOS ONT --> ActionTec MI424WR (Router) --> (Private network) LAN (Airport Extremes 802.11n, Time Capsule, Airport Express 802.11n, 802.11g + WDS) --> Computers and other devices
Comcast setup (Test network)
Motorola SBG 6850 --> Public Network WAN --> (Airport Extremes 802.11n, Time Capsule, Airport Express 802.11n, 802.11g + WDS)
From the Early 2009 Airport Networks Design manual...
"Connect all of the AirPort Extreme Base Stations and Time Capsules to the same subnet on your Ethernet network. "
I have no control over the IP addresses assigned to the Airport access points under the Comcast scenario.
The DHCP function on the SBG6850 has been disabled by the ISP. Factory resets and custom configurations get over-written when the modem connects to the ISP and downloads a new configuration via TFTP.
Adding a router makes little sense as the Airport devices already have that capability.
Has anyone solved this type of a problem before?
All input is much appreciated.

Connect the Modem to the router on Internet Port and Desktop Computer to the router on Ethernet Port1...Now,reset the router for 30 seconds,Release the reset button...Unplug the power cable from your router, wait for 30 seconds and re-connect the power cable...Now,check the ip address...
Click Start >> All Programs >> Accessories >> Command Prompt...A black box will appear(Command Prompt)...In the Command Prompt window type ipconfig and press 'Enter'...Look for Ethernet Adapter Local Area Connection IP Address , Subnet Mask and Default Gateway...
IP Address should be 192.168.1.x, Subnet Mask : 255.255.255.0, Default Gateway : 192.168.1.1 (assuming your router is 192.168.1.1)...If you get the above mentioned IP Address, Subnet and Gateway Address then you should ping the Gateway, type ping 192.168.1.1 and press Enter...If it gives you request timed out then disable any firewalls, security softwares on the computer...
If you get 4 replies then,Open an Internet Explorer browser page on your wired computer(desktop).In the address bar type 192.168.1.1 and press Enter...Leave Username blank & in Password use admin in lower case...
On the main setup page the ""Internet Connection Type"" should be on ""Obtain IP Automatically - DHCP “. Click on the Save Settings button.Now click on the sub tab ""MAC address clone"".Click on enable and Click Clone & click save settings
Check WAN Ip on Status page of router .... If getting Valid Ip .... try going online...If not ... power cycle for 4-5 minutes & then again check the WAN Ip address ..... 

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  • Basic Intel iMac with 802.11n - no mobile devices or broadband. What do I need in Australia. mrcos

                                   Saturday 7 January 2012
    I am writing to ask for some advice regarding the best course of action to take with regard to my current computer situated in Sydney Australia.
    I have been a Netspace customer for many years with an old iMac until I purchased a new iMac in the latter part of 2011. All this time I have been a dial-up participant with no broadband, gaming or little or no downloading. This account will expire late next month.
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    Hi Peter Ducklow-
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    and so? what shall I do?
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