Bridge mode is a configuration that disables the NAT and DHCP functions. Placing your ISP’s router/modem into bridge mode allows the SonicWall to control those functions on your network. Bridge mode also allows for remote management of the SonicWall. You will need to call your ISP (Internet Service Provider) for the bridge mode settings. Sometimes you can find them on the internet for your router/modem.
NAT (Network Address Translation) allows multiple devices on a private network to access the internet using a single WAN or public address.
DHCP (Dynamic Host Configuration Protocol) is a network protocol that is used to configure network devices so that they can communicate on your network. DHCP allocates IP addresses to devices on your network. Without DHCP, you are required to setup static IP addresses for each device. We normally setup servers and printers to use static IP addresses and PC’s to use DHCP.