[ubuntu] How to install a Linux router?

Hi all,

Coection
FTTH (500mbps) -> ONT (4 ports) -> 2 PCs-Virtual Machine
(Dynamic IP)

ONT-Huawei HG8045

Oracle VirtualBox
Host Ubuntu 14.04 desktop
VMs Ubuntu 14.04 desktop/server/Windows 10 etc.
(PC-4/8 cores, RAM-8/32G, HDD-SSD 1TB, about 20 VMs ruing on each Virtual Machine)

ONT assigned IP - 192.168.8.2/3/4/5 etc.

Instead of coecting a hardware router to the network, I'm considering building a Linux router on a VM ruing Ubuntu 14.04 desktop/server.

Please advise which software shall I use pfsense/Quagga any others?

Thanks

Regards
satimis