Hey dude, I think you can achieve that.

Hi dude, have you ever try to disable the firewall? BTW, if you can translate the error to English, maybe we can find what the problem is.

ravikb wrote Some specific vendor routers did not support it. They wanted me to configure the DSL modem in bridge mode and then do the authentication in the dual WAN router and that is not what I...

Hey guys, I got a reply from TPLink about this issue, and got a beta firmware. Maybe useful for you. http://static.tp-link.com/TL-SG108E(UN)_V3_170717_Beta.rar...

Specifically with double-NAT with AIrtel DSL What do you mean ? I think all the Dual-WAN router can do that.

Can the R470T+ get IP from the Fritzbox 7362?