A Realtek RTL8111HS is used to provide the second Ethernet interface from the PCIe bus. The 12V is also distributed out through some JST XH connectors to other pieces of networking equipment like the VDSL modem, network switch and WiFi access point. The RouterPi takes 12V in and regulates it down to 5V for the CM4. Buttons for safe shutdown and restart/boot.2x Gigabit Ethernet interfaces (CM4 onboard & Realtek RTL8111HS).Raspberry Pi Compute Module 4 with 2GB RAM & 8GB eMMC.But then a few months later the Compute Module 4 was launched, and now the RouterPi carrier board: This was the main driving reason that I made the PCIe bridge “chip”, so that I could add a PCIe network card. Then came the Pi 4 with 1Gb Ethernet on its own bus and USB 3.0! However, I still wasn’t happy with the increased CPU overhead and power consumption of having to have the second Ethernet interface connected to the USB 3.0 hub. So, for the better part of a decade, I’ve been using a small fan-less Intel N3050 mini-ITX system with a Gigabyte N3050N-D3H motherboard that had dual onboard Ethernet running Debian Linux from a USB stick. There were other Pi-like derivatives, but their software and long-term support didn’t look great. The Pi 2 had 100Mb Ethernet and the Pi 3 had 1Gb ethernet, but it was shared over a USB 2.0 bus thus limiting it to a few hundred Mbps. I needed two ethernet interfaces that could handle 1Gb traffic with low latency. Another Raspberry Pi router! I’ve been wanting to use a Raspberry Pi as my home internet router for a long time, but previous versions were not quite up to scratch.
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