Netgear LB2120 bridge mode operation
I have a question about the operation of the LB2120 LTE modem in failover while in bridge mode.
It seems to me that if one has a high performance router then bridge mode would almost be required, since the LB2120 doing NAT and performing other router functions is going to slow things down. If so, then I'm assuming that it must work in the following way:
1) Obviously the router requests a public IP address directly from the cable modem.
2) In order to test if the cable modem Internet connection has failed the LB2120 must use the same source IP address that was given to the router. Therefore, the LB2120 must be snooping DHCP requests (from the router) and responses (from the cable modem), so that it can have the appropriate public IP address.
3) If the cable modem Internet connection fails and the LTE modem becomes active then the IP address is no longer correct and the IP address assigned to router must change. Does the LB2120 send a FORCERENEW to the router? How is that accomplished?
4) Needless to say all active connections would be lost. This would be true in either router or bridge mode, since all peer connections have no way of moving to the newly assigned public IP address. It would be as if the cable was disconnected for a time and then reconnected--not a big deal for most applications as long as it doesn't happen frequently.
Am I understanding this correctly? I'm really interested in the mechanism used. I haven't purchased this device yet, but I'm seriously considering it.