In our small office a LAN is connected to a modem router that will VDSL to the Internet. As a Windows 2003 R2 server exists in the LAN, I was wondering if is there a way to use this server as a router, enabling traffic shaping/QOS policies, to avoid network clogging.
- Now: LAN clients -> Modem -> Internet
- Future: LAN clients -> Software Router - > Modem -> Internet
Windows Server 2003 R2 has already hit mainstream support end-of-life a few years ago, and is scheduled for complete end-of-life in a few months. I would not use it for anything, much less a router replacement.
You're going to be much better off with an actual router or firewall.
To answer your odd question: Yes, with the right configuration and software, Windows Server 2003 R2 is capable of being used for QOS and traffic shaping.