The following embedded x86 machines will run m0n0wall.
All Soekris devices are fully compatible with m0n0wall. For the net4501 and other 45xx models, use the net45xx image. For the net4801 and net4826, use the net48xx image.
Specifications
net4501-30: 133 Mhz CPU, 64 Mbyte SDRAM, 3 Ethernet, 2 Serial, CF socket, 1 Mini-PCI socket, 3.3V PCI connector. net4511-30: 100 Mhz CPU, 64 Mbyte SDRAM, 2 Ethernet, 1 Serial, CF socket, 1 Mini-PCI socket, Single PC-Card socket, PoE. net4521-30: 133 Mhz CPU, 64 Mbyte SDRAM, 2 Ethernet, 1 Serial, CF socket, 1 Mini-PCI socket, Dual PC-Card socket, PoE. net4526-20: 100 Mhz CPU, 32 Mbyte SDRAM, 1 Ethernet, 1 Serial, 16 Mbyte CF Flash, 2 Mini-PCI sockets, PoE. net4526-30: 133 Mhz CPU, 64 Mbyte SDRAM, 1 Ethernet, 1 Serial, 64 Mbyte CF Flash, 2 Mini-PCI sockets, PoE. net4801-50: 266 Mhz CPU, 128 Mbyte SDRAM, 3 Ethernet, 2 serial, USB connector, CF socket, 44 pins IDE connector, 1 Mini-PCI socket, 3.3V PCI connector.
For a detailed walk-through of getting up and running with m0n0wall on Soekris hardware, see the m0n0wall Soekris Quick Start Guide.
Wireless Router Application Platform (WRAP)
PC Engines WRAP boards are fully compatible with m0n0wall. Use the WRAP images available on the download page.
The Nokia IPxxx boxes were built to run Check Point, but they are standard PC hardware and will run m0n0wall.
You can pick up a used IP110 or IP120 for around $100 USD on eBay.
IP110, 120 and 130
Three 10/100 Ethernet interfaces
National GX1 300 MHz processor
64 MB RAM on 110, 128 MB on 120, 256 MB on 130
5 GB hard drive
Two serial ports (auxiliary and console)
Quiet - hard drive is only moving component, no fans
IP330
Three 10/100 Ethernet interfaces
National GX1 300 MHz processor
RAM typically between 64 MB and 256 MB
Hard drive typically ranging from 4-20 GB
Two serial ports (auxiliary and console)
Has case fans, so not quiet like the IP1xx
IP440, 530, 650, 740
Even in the used market, these boxes are usually out of the price range for a typical m0n0wall installation, and you can buy or assemble a comparable standard PC for far cheaper. But, if you have one laying around or can find one cheaply, these will run m0n0wall. Some of the optional interfaces like HSSI, T-1 CSU/DSU, V.35 and X.21 serial, OC-3 ATM, FDDI, etc. will not work, but the Ethernet will work fine.
There are some tricks to getting m0n0wall working on Nokia hardware because the NIC's initially show MAC address ff:ff:ff:ff:ff:ff. For pictures and complete instructions, see this page.
NexCom's Nexgate line of appliances all support m0n0wall. These are much more high end than the WRAP and Soekris platforms, and hence are much more costly. There are a number of different configurations available, with prices starting over $500 USD for the most basic model. Contact NexCom for pricing.