I've watched this thread progress throughout the day today, and I feel the need to interject, clear up some details.
The verizon router can pull its wan connection from either the ethernet or the coax. If you are running above 75 Mb down, your router has to pull its wan from the ethernet, requiring you (if you have set-top boxes) to have both the ethernet and coax connected.
Do you need a verizon router if you have verizon video services. No. Not at all. I can confirm this (at least in my market). However, you will need a verizon moca piece that the STB will end up talking to for their, well, their everything.
[Link: actiontec.com] This piece will allow your boxes to talk without the verizon router. (There maybe an updated model).
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Regarding two routers:
I don't know who Springs is. Apparently a network demi-God. I'm glad he can get it to work bulletproof. I wish my company gave me the time (and compensation) to fully integrate two routers into an existing network. It's a horrible idea. I realize, saying that, that a riot will start in the minds of many who read it.
Look. If you touch the network, you own the network. I have this conversation with my partner all of the time. We will have clients tell us that their network is solid and they have someone who manages it. However, if I make a dhcp reservation or set a port forward or change a dhcp range, I have touched the network. What's the difference between setting a new subnet and setting a port forward? It's the same number of button presses. You touch it, you own it. End of story.
It really doesn't matter what router you put behind the verizon. It can be the $9 dlink Tiger Direct B-stock router or the big boy (name your brand) expensive router. At the end of the day, dmz or no, it still needs to route it wan to the lan of the verizon router, marking a choke point. On top of that, most guys I know can barely manage a single router config, much less having to do it twice. Adding that next hop also has the potential to degrade your performance. I realize we are talking ms difference here, but really, what is your additional router doing that the verizon can't?
It's needless complexity to the network. It's a harder config for you as the installer, it's a harder config for the next guy to come out and service it (as much as we all love to thing we hold onto our customer forever, I fixed 3 jobs last week from 3 of my competitors, all networking issues), and I have seen the full gamut of stupid networking decisions.
It makes sense to add your own switch. Make it multi-layer if you are feeling bold. It makes sense to manage the wifi (we all know ios is controlling everything now or your control system has a wifi remote). It makes sense to add your own l2 switches for your control system nodes and a/v gear. Access points and AP managers are all perfectly logical.
To scatter things further by adding one more router makes me scratch my head. Why?
If you can't make your verizon (or other ISP router) do what you need to do to get your job done, then you need to get out of the game. I'm sorry. It's that simple. If you can figure out how to dmz verizon and port forward your ubiquiti, then spend some time learning the ins and out of the verizon. I have manuals from every rev you can think of. Here's the most common variety:
[Link: dropbox.com]What are you going to do? Leave all the customer's exist everything downstream from the actiontech and leave your gear down stream from your router? Again, one more hop to get information transferred. The efficiency is wasted, the complexity increased, and the performance gain is negligible at best.
Note: I fully understand this is probably something everyone will have an opinion on. And really, I do not mean to start any sort of bad blood, mud slinging, or otherwise. It's just my opinion, and I am not trying to start a ridiculous back and forth like we are talking about how good Fujitsu TVs are. I just think dual routing is a poor poor idea and a total waste of time. It takes a high degree of skill to do it right, the double NAT issue is ridiculous, and one day your ISP is going to come out and switch out their router and mar the whole thing up. You might as well Keep It Simple........