Well...no the routers were not set up to do anything with the ddns, and no dns update clients on any of the computers.
I set up regular routers just so they can share the internet connection, and nothing else.
And the DVRs would do the updating, ofcourse once they are setup to do so, with the correct gateway, etc...
I'll probably go there and try to setup the router to do it, and see what happens...I'll post back results.
Meanwhile if you are interested I have awsome DVR that's very user friendly and you can even choose your own domain with in the DVR i.e. davedotdvrdotnet and that would be the address you connect to for viewing...the DVR does everything on its own you just choose the name, and open a single port on you router and you are done. It even has 2 way audio so you can talk back to the people where the DVR is from your remote location. contact me for more info.
Thanks