For ASUS router you can use it as the main router, you’ll just need to plug it in to lan port 3
Same goes with tplink also but not lan port 3( a different port)
For example:Means it’s going to be maxis/TM modem —> Asus router —> Maxis router(Ethernet port 3 on ASUS router) for VOIP
Wow I've been looking for this. This basically answers the 1st question. This should work the same way with other brands also right? I don't get the lan port 3 part. Can it be any other port on any other brand?
If I connect the router as lan to wan, the secondary will be on it's own private network even though its sharing the internet.