First of all I’m not a network guy and there is none in my company to do this. I’m a developer. I have managed to setup the router to work in normal condition but I need it to work with my firewall. Currently my firewall (sonicwall) can dial to the ISP. My vendor asked me to set the router to bridge mode \ 1:1 netting so that the firewall can dial out and the VPN connection from outside can work smoothly.
If you want outside VPN clients to connect to your SonicWall, then you need to set-up a NAT in RB and forward the appropriate VPN port to the SonicWall. On RB, go to IP > Firewall > NAT , Add , (on General Tab) dst-NAT, Dst-Addr plug in your Public WAN IP address of the RB, protocol 6, DstPort (port that SoncWall is using for incoming VPN connections). Go to Action tab, dst-nat, ip addr: plug in your sonicwall ip addr, and plug-in port number of incoming vpn connections for sonicwall. This will open a port on the SonicWall for the incoming VPN clients - you can also open a range of ports (e.g. 80-82), and open additional ports for any other services.
If you’re not using RB for anything specific, why not just get rid of it, and have SonicWall do everything? This way you can set-up a Public IP address on WAN connection for SonicWall and it’ll work well… won’t need to open any ports on the RB.