Setup for backup (spare) ZyWALL 110
We setup and installed a ZyWALL 110 for a customer, so we can access a small network via VPN at this customer. Now the customer want to have a spare ZyWALL 110, so he can switch to this spare one when the primary ZyWALL 110 is not working for some reason. High availability is not possible, so we want to connect the spare one to the primary one to copy the configuration occasionally.
What is the best setup, so we can copy the configuration remotely? Only P1 (VPN access), P4 (to local network 1) and P5 (to local network 2) are in use.