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IPCop Linux Firewall

Daniel Schuhmann

February 09, 2006

How Many NICs?

The number of network interface cards (NICs) a router needs depends on its intended use. However, it will always require at least one card. In our example, we used two NICs, which corresponds to the classic DSL or cable setup (Figure 2). In this configuration, one NIC is attached to your home network (the "green interface") while the other connects directly to the DSL or cable modem (the "red interface").

Topology of our two NIC router

Figure 2: Topology of our two NIC router

An ISDN card or an analog modem can also replace this second card, depending on your connection. Additionally, a "blue" interface for WLAN, and an "orange" one for additional server-based services, are also possible. Figure 3 shows the maximum four-card configuration.

Network topology for the largest configuration

Figure 3: Network topology for the largest configuration

IPCop Router Hardware Recommendations
CPU/Motherboard	Intel or AMD CPU; Pentium class or above, 100 MHz minimum speed (Socket 7, Socket 370, Socket A)
RAM	256 MB SDRAM or DDR-SDRAM
Storage	20 - 40 GB for Website Cache (Proxy)
Network	Two 10/100 NICs
Graphics	Any 2MB card, no 3D features needed Only required for installation
CD-ROM	Any Only required for installation
Floppy	Not required
Keyboard	Any Only required for installation

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Tags: IPCop, Linux, open source, router,

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