Open/PFsence or clearOS

[#1]

Need a bit of advise please
I'm running sever racks and have clearos installed on one that passes to my switches then my servers.
However I have a useless Asus dsl 16 (using as modem only) one hub refused point blank to register clear of machine so can't use that.
I ideally want to bypass the modem and use open, Pf or clear as modem and router..... However Pppoe in clear doesn't seem to work.
If anyone has or does use any with plusnet please give me opinions.

Thanks in advance

[#2]

Have a look at the Vigor 130 modem which supports PPPoE passthrough out of the box. I’m currently using the Vigor 130 with an Ubiquiti EdgeRouter and Unifi AP and it’s very stable.

[#3]

Found on ebay for £35 to £100 thank you... at the mo im using one of the huwiee (open reach modems) it's cracked and hacked but has a big issues with port 80, my media server and my gaming server.
Email ports are about the only thing I'm not having issues with