Probably too late but I happened to stumble across your
post while attempting to do the same thing. Couldn't find any
sites about it, but after a bit of playing around, I figured out how. I
had Verizon DSL, just switched today to Optimum Online Cable
modem. Was using the same Westell 327W, optimum provided
basic cable modem.
-Connect cat5 cable from ethernet port on cable modem to
ethernet port 1 on westell. (Must be port 1)
-Connect cat5 cable from computer NIC to other port on westell.
-(You may need to) Start->Run->cmd
ipconfig -release all
ipconfig -renew
Here's the trick...
-Open web browser, go to westell homepage (likely 192.168.0.1)
-Configuration tab, Advanced WAN->WAN
-Change WAN PORT drop down from DSL ATM PORT to
ETHERNET PORT 1
-Click Edit button. Change Protocol from PPPoE to
ROUTED.
-Radio button for DHCP Client to Enable.
-Click Set button.
-(You may need to) Power cycle both Cable Modem and Westell
device
That should be all, you should now be able to connect to internet
through the Westell DSL router. I may have left something out,
but if so, hopefully these directions should be enough to get you
on your way. Anyway, it is possible to use Westell DSL router as
a (wireless)router for your cable modem. Good luck.
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Thanks this help, I tried this and it works, two thumbs up