I am trying to understand the underlying traffic flow in an OpenWRT router (or any router in general). And I find myself confused with the WAN - LAN traffic. Apologize in advance if this is a dumb question.
My understanding is that if we want to link any of the subnets, so that traffic can flow between them, we need to connect them via a bridge interface. Just like we need to build a lan
interface to join the vlan
of eth0.1
and wlan1
. However, I am not able to find anywhere in the system that we joined the wan
and lan
. So I wonder what's going on here. I do see we can do very flexible traffic control between wan
and lan
with firewall. So is that the CPU would by default automatically connects together all the vlan
s that have a port to it? And the firewall here is only to add restrictions to these connection, rather than allowing it? (In other words, if the firewall is disabled, those vlan
s can then freely connect to each other via CPU with out limitation?)