So I had this crazy idea that I'm not sure is possible.
I have a modem router (GPON ONT) with 4 ethernet port and 1 WAN port (fiber optic) from ISP :
All ethernet ports is for LAN devices under the GPON ONT, but it has been changed by the ISP so it does the following :
Port number #1 is for LAN (GPON ONT GUI can only be accessed through this port)
Port number #2 and #3 is in Bridge mode (this cannot be changed, hardcoded from the ISP)
Port number #4 is for IPTV (it has its own VLAN and this cannot be changed, hardcoded from the ISP)
I connect port #4 to STB and port #3 to OpenWRT router.
This GPON ONT have USB slot in it and it's strong enough to power my USB HDD. I want to be able to access this HDD from my LAN (like NAS).
But the problem is this GPON ONT is not in my LAN. So I thought it's going to be easy because port #1 is available, I could just plug ethernet cable from OpenWRT router to GPON ONT port #1
But it does not work. I checked the DHCP list in the OpenWRT and the GPON ONT didn't get any IP. Here's my GPON ONT settings :
So is it possible?