You're right. There's no DISABLE button for the coax WAN interface on the Westell.
I know there's a regular poster on here that uses a Westell as a MOCA bridge, although I suspect he has a cat5 WAN connection which would obviate the need to disable to coax WAN interface. I've sent him an IM regarding this thread.
In the mean time, on the Configure Broadband Connection (Coax)
page, I would suggest setting the Auto Detection
radio button to off and see if that prevents the remote Actiontec from becoming the primary router.
One other thing to try:
•On the remote Westell, go to the Configure Broadband Connection (Coax)
page, select QUICK SETUP, then change the WAN INTERFACE pull-down from AUTO to ETHERNET and APPLY. This should disable the MOCA WAN interface.Thanks to guppy_fish for the suggestion.