Raspberry Pi as Router & Server

The Plan is to use a Serial RS232 Connection for connecting the Amiga to my Home-Network and the Internet. I want it 2 achieve the „classical“ way also with it's Speed-Limitations.

I'm doing this even if i know it would be slow and that i can achieve this maybe with pi-Storm and it's Wlan.

I also would span the Project over 2 Raspberries, for sure u can only use a single Pi for it.