Ian,
Thanks for the reply. At least you did so ...
According to the Clear support person who helped me set it up, 192.168.15.10 is a WiMax arbitrary address "alias" assigned to the LinkSys router for the purpose of passing all incoming port calls directly to the router to manage, so the WiMax modem can effectively "stay out of the way". I think the several WiMax configuration screens demonstrate that 192.168.1.1 (or...10, I forget without looking), the router address, is the object of the assignment.
Now, that this scheme somehow is not working properly is another matter. I did try backing off the router aliasing and forwarding port 88 from the WiMax directly to 192.168.1.100 (the computer hosting Broadwave), and it seemed to make no difference, so I set things back as they were.
For the record, I also temporarily completely disabled the WiMax modem firewall, too, counting on the LinkSys to keep things safe. That did not seem to work either.
I'm mystified. I would really like to get Broadwave to work. I just invested in WavePad Master and some other NCH product, so I'd like to stay with a single vendor. Seems like it should be a much easier process to complete. However, I guess when you have to juggle 3-5 sets of configuration information (modem, router, computer, firewall, software), it requires a row/column (setting/device) approach to get everything right.
If I ever DO get this sussed out, I'm NOT going to leave one of those classic quick-take, "Oh, OK, never mind. I figured it out," postings I keep seeing on various forums. I will lay out my settings in dreadfully complete detail, either in a post or in another online doc that can be linked and used and, hopefully, save as many headaches for others as I possibly can.
RS