I am using an RB3011 with a sierra MC7700 and it works great. I use this mainly as a backup for VOIP phones. However, I have experienced one issue which is particularly annoying. Despite the fact that I have the “add default route” option disabled on the LTE, it will randomly (not sure what the trigger is, usually happens at night) add a default route into the route for all traffic. This basically has the effect of breaking the whole internet connection, as the subnet which contains the computers is not srcnatted to the LTE interface (because they would use up all our data).
Anybody have any ideas on this?