I want to route all traffic in my home network through a vpn. I currently have a sagemcom FAST 5364 router provided by my ISP. I also have two previous routers, which I don't use, from my ISP (Huawei hg633 router and an old D-Link router).
My initial thought was to flash firmware onto my router so that I can set up a VPN connection on my router, which none of them support. I've checked the dd-wrt and open-wrt websites if they support any of the three routers and they don't support.
My current internet speeds is 40Mbit/s down and 10Mbit/s up. I'm on a really tight budget, so I was thinking that I could get a supported cheap router that I can connect my LAN to. This router wouldn't need anything greater than 100mbps ethernet, wouldn't require wireless capabilities, and would only require minimal amount of ethernet ports.
All devices on my LAN will be connected to the Sagemcom router, since it's pretty decent with support for dual band wifi, wireless AC, and has 4 gigabit ethernet ports. This would mean fast data transfer between devices on the LAN. However if I wanted to access the internet, the sagemcom router would forward any requests to the cheap router. Are there any issues in this? Would anyone recommend any cheap routers that has support for dd-wrt or open-wrt.
I'm open for any alternatives. Also, I don't mind purchasing used hardware. Btw, I have a high end PC connected one meter to the router, so is it possible to route all traffic through there so it can handle the encryption and decryption process. Also have a spare raspberry pi 3B+ not being used in any project.
Edit: I haven't chosen a VPN provider yet.