We presently run our own mail & web servers in our data center.
Our data center is connected to the internet with a Verizon "Metro Ethernet" line.
Our router which connects to the Verizon service has an available slot and is capable of connecting to a Verizon 4G LTE wireless card, which is supposed to "kick in" should the primary service drop.
Verizon Wireless tells us that through the miracle of BGP, they could essentially create two paths to our public IP addresses which are presently associate with the Verizon Metro Ethernet. Should the primary service go down, people could reach those public IP addresses via the wireless LTE without us needing to make DNS changes or "swing" our public addresses over to another ISP. We presently have half a class C of public addresses.
1) Is it best practice to use wireless as our "backup" to avoid ALL "last mile" & building infrastructure issues? (e.g. a car hits the telephone pole in front of our building, or our basement floods.)
2) Might a heartier connection like a comcast cable modem as our backup line be better? (Though appealing because it's not "metered by the gig", it could be susceptible to a flood in the basement taking out verizon and comcast). Further, in a more widespread power outage, our data center will be on generator (as I'm guessing would verizon cell towers). Would Comcast have all equipment between us & them on battery backup?)
3) Would it be easier and less susceptible to finger-pointing to have verizon wireless backup the primary verizon internet connection? Does Comcast & Verizon play well together? If it failed to fail-over in an emergency, would we just hear a bunch of finger pointing?
4) Is it more complicated to setup this BGP magic with two competing entities vs. two companies that have the word Verizon in their names (although technically, different companies)?
Any suggestions would be very much appreciated.