not necessarily, unless you have a more capable router to use as your gateway. having OpenWRT does open up some features.
ang kailangan talaga ay isa lang ang gateway na nagpe-perform ng NAT (network address translation) from your internal IP range to your public IP address. sure, pwede naman mag-doble, pero unncessary complication na ito.
obvioulsy, gumagana naman 'yung Option 2 para sa'yo. do you need any feature/functionality from OpenWRT? if you do, mas maganda kung naka-bridge si Mamba. kung hindi naman, magdodouble-NAT ka (Mamba + OpenWRT). gagana naman rin 'yan.
do you have the option to bridge Mamba? let OpenWRT do the routing (local IP subnet <-> public IP).
kung hindi naka-bridge, at gusto mo i-try.
- set OpenWRT WAN port to DHCP Client (auto) para maka-pickup ng IP address from Mamba
- set OpenWRT DHCP Server to a different subnet from Mamba - kung 192.168.8.0/24 si Mamba, gawing 192.168.10.0/24 ang DHCP range ni OpenWRT sa LAN side
si OpenWRT ay makakakuha ng 192.168.8.x IP address kay Mamba, tapos 'yung naka kabit kay OpenWRT ay magkakaroon ng IP address na 192.168.10.x. ganito dapat ang IP address ng mga AP at iba pang client mo.
mabuti pa i-post mo ring 'yung config ng OpenWRT router...