I also have the GWN7003, two of them, my setup:
- Primary GWN7003 at home - 2degrees gigabit fibre, PPPoE, static IPv4 (approx 920/550 with hardware acceleration on - see manual)
- Secondary GWN7003 at remote property - Skinny 4G wireless broadband (permanently connected via OpenVPN link)
- I use OpenVPN clients on phone (Android) & laptop when out and about to connect back to home GWN7003 (and also access secondary GWN7003)
- Both GWN7003's powered by PoE
- Use DNAT to forward some ports for servers
- Have also tested a 2.5G SFP RJ45 module, successfully connected & routed 2.5G to a QNAP Nas with 2.5G port
I haven't played with IPv6, the WAN page in router shows IPv6 status connected, with a local and global IPv6 (not sure if my 2D static IPv4 comes with static IPv6, had my static IPv4 since Snap days)
Little digging into settings I can see I could relay IPv6 from WAN to clients on VLAN, but haven't gone any further, so can't say what does or doesn't work.
If you want to know anything else, just ask.
User manual can be found here: https://documentation.grandstream.com/knowledge-base/gwn700x-user-guide/


