I have a routed wireless network with sort of X-mas tree topology.
Each client is behind CPE/router that is NAT’ing client’s LAN network to CPE IP.
Each AP has IP’s assigning to its associated CPE’s and from their connections are routed to default gateway or by routing tables from top to bottom.
X-mas tree has several /24, /25, 26/ etc. networks in its branches and border gateway (top) connects to internet and nat’s every client to its unique public IP.
Now I have one client A that somewhere in tree’s branch need to have PC’s of client D somewhere else on a completely different branch to make part of same network.
CPE of client A can ping CPE of client D directly and vice versa over my internal network. As said, both LAN’s are behind nat firewall. So PC on LAN of client A can reach router of client D and vice versa. But each client’s PC cannot reach directly other client’s Pc’s. (Because masquerade nat)
Which tunnel/bridge is now recommended to connect both networks like they are one and the same physical network?
Should I use Vlan? But did this not have repercussion on wireless?
Should I use PPtP, EoIP, GRE, IPIP, L2TP or whatever?
I have been reading manuals of each several times but to be honest need an advice on when to use which tunnel.
Actually MT should make a tutorial so ´newbee´ in this field can make an decision before he proceeds and start building one.