Avoiding double-NAT when connecting through ISP router

Adrian Bantin 0

Hi,

I'm trying to figure out what's the best config to have Amplifi obtain its internet connection via my ISPs modem router. Originally I had the ISP modem in bridge mode, however I have connection reliability issues, and have connected a failover 3G USB dongle. Since that doesn't work in bridge mode (xDSL only), I need to route traffic via the modem router.

There seems to be a few options to avoid double-NAT issues

put Amplifi in a DMZ on the modem router
DHCP relay from modem router to Amplifi
put Amplifi in bridge mode
turn off NAT on the modem router??

Just wondering what the advisable and most network-efficient config would be in this scenario?

Thanks