I am transitioning my home office to a new Frontier Business Fiber Internet 500 (500Mbps up/500 Mbps down). I have been provided with a Sagemcom FAST 5290v2 router with an integrated WiFi hub (2.4GHz/5.xGHz/5G). I need a static IP address in order to have external access to my Fedora server. On my previous provider, I could attach my own edge router to the (cable) modem, but Frontier tells me I MUST use their router, because of the peculiar way they have implemented their static IP.
I see that the router attaches to Frontier’s regional network with DHCP. The static IP address is implemented through a feature they call “a public subnet”, which seems to be some non-standard VPN mechanism.
If I just connect my old edge router behind the Sagemcom, everything works, but I lose most of my bandwidth, because my old router has 10/100 ethernet ports. If I take it out and put the “public” IP address as an additional address on my server’s ethernet port, my server can connect both in and out, but the PCs on my network that rely on NAT addressing cannot get out to the internet.
Frontier can/will not provide me with a manual for the router, and I cannot find it on the Internet. Sagemcom have many manuals on their website, but not this one.
I think the issue is just that I need to understand the relationship between the “private subnet”(192.168.1.1/24) and the “public subnet” (x.xx.xxx.y/30) and also their understanding of “DMZ host” and “cascaded router”, two other features mentioned on the configuration screen, both of which are turned off.
- Are the two LAN ports on the back bridged together or are they two separate networks?
- Are the “private subnet” and the “public subnet” intended to co-reside on the same ethernet, or are they intended to be separate physical networks?
In the absence of a User Manual for the router, I have tried asking the Frontier help desk, but I have not been able to reach any agents that can work beyond their very limited scripts, so I really do net the manual that I cannot find.
Maybe, my server needs to have two different ethernet cards for the two IP addresses, and have the two inside subnets attached to separate LAN ports on the router? That would be fine, but without documentation I am unlikely to get a working setup.
