Asus routers have a “Media Bridge Mode” that does exactly what you want

But obviously if the wireless signal is poor where you’re planning to put the Proxmox server, you shouldn’t expect miracles.

CGNAT affects accessing your LAN from outside your network, i.e. over the Internet. Traffic within your own LAN is not affected whatsoever.

Mikrotik Wireless Wire

There is no such thing as cat 6E cables. Also, matching the wifi number to the cable category number is unnecessary and pointless.

Cat 6 will support 1 Gbps, 2.5 Gbps and 5 Gbps to a distance of 100 metres, and 10 Gbps to a distance of ~55 metres.

Keep your cat 6 cables and don’t waste your money.

Set the secondary router to access point mode. Then you’ll just have one big network.

So the maximum speed tier you can subscribe to will be 100/40

Honestly, a great modem router for this is the Telstra Smart Modem Gen 2 (model number DJA2030 or DJA0231). You can often find them unused on Gumtree or Marketplace for under $50. They are not locked to Telstra (work fine on Aussie Broadband) and come with a built in SIM card that will kick in if NBN is down.

That would be my recommendation.

1000/50 is not available on VDSL NBN connections (FTTN, FTTB, FTTC)

Why pay anything when DuckDNS is free?

Connect your computer directly to the modem or ONT as a test. If you get full speed, router is the culprit.

Make sure flow offloading is enabled on OpenWRT and any QoS is disabled. As a last resort, revert to stock firmware.

You’d put the Xfinity modem router in bridge mode and connect your own router

Yes, port forwarding will work on the router. The Xfinity box will be acting as a modem only, so will forward all traffic to the router and it’s up to the router to do everything else.

Go to add printer, then click my printer wasn’t listed, then add by name using the share path from your screenshot

OPNsense and do PCI passthrough of the NICs

Might just be India or your specific ISP. I’ve lived in a handful of countries and none of my ISPs charged extra for allowing incoming connections.

Wireless will never match a wired connection in terms of throughput or latency. 600 Mbps is actually very good for wifi 5 and decent for wifi 6.

Upgrading to wifi 6e may net you faster speeds, but really it’s anyone’s guess since wifi performance is so dependent on the environment in which it’s operating.

If there is existing coax cabling in your place (one outlet near your router and one near your PC) you should definitely look into MoCA.