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Wesley Moore 2012-01-21 15:35:53 +11:00
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A few months ago we were having a lot of trouble with reliable After ongoing issues with maintaining a reliable Internet connection at
internet. The problem was that we had up to three computers and three home I decided to add a router box to the network in charge of assigning
iPhones on the network at once, and a 1.5Mbit ADSL connection that was IP addresses and sharing our Internet connection with the rest of the
very easy to saturate if one or more of those devices was uploading or network. I wanted something with at least two Ethernet ports so that
downloading. Additionally our ADSL router would slow and eventually stop all Internet traffic would flow through the device and allow bandwidth
working after a day or so of BitTorrent traffic flowing through it. hogs to be identified at times when the connection appeared flooded.
So there were a few problems that needed addressing. I needed a way After a bunch of research into appropriate hardware and software I
to offload the routing from the modem, get some insight into what decided on a [PC Engines ALIX][alix] single board computer (alix2d13). The
was using bandwidth and ideally set up some <abbr title="Quality of ALIX is a small board about the size of a CD case with the following
Service">QoS</abbr> so that some bandwidth was reserved for higher features:
priority traffic like HTTP and SSH.
My chosen solution was to drop some birthday money on an [ALIX single * 500Mhz AMD Geode (x86 compatible) CPU
board computer from PC Engines][alix]. I ordered the alix2d13 version * 256Mb RAM
along with a nice silver case for it. Its a neat little board around the * 2 &times; USB ports
size of two CD cases stacked on top of each other. It has a 500Mhz AMD * 3 &times; 10/100 Ethernet ports
Geode (x86 compatible) CPU, 256Mb RAM, USB, 3 &times; 10/100 Ethernet * Mini-PCI socket (for WiFi if desired)
ports and an on-board CompactFlash socket. * RS-232 serial port
* CompactFlash socket
Along with the board I ordered one of [PC Engines cases][case]
(case1s2u) to go with it.
[alix]: http://www.pcengines.ch/alix2d13.htm [alix]: http://www.pcengines.ch/alix2d13.htm
[case]: http://www.pcengines.ch/case1d2u.htm
TODO(Add Photos) For the software I settled on [OpenWRT][openwrt]. I chose it for a number of
reasons:
Whilst waiting for the board to arrive I checked out some open source * Good support for ALIX boards.
router targetted operating systems such as [pfSense], [m0n0wall] and * Designed to run from Flash and read only file systems.
[IPFire][ipfire]. I decided to go with m0n0wall as it was based on * Great binary package manager that allows additional software to be
a good foundation ([FreeBSD]), happily fit on an 8Mb CF card I had lying installed.
around and had out of the box support for the ALIX boards. * Lightweight [Lua] based Web UI available ([LuCI][luci]).
[pfSense]: http://www.pfsense.org/
[m0n0wall]: http://www.pfsense.org/
[ipfire]: http://www.ipfire.org/
[FreeBSD]: http://www.freebsd.org/
m0n0wall was a breeze to get up an running. I basically inserted the CF
card, powered the board up and it was working with separate WAN and LAN
networks, with NAT and firewall between them. It was very easy to add QoS
through the guided traffic shaper configuration as well.
I ran the board like this for a while and it helped with our issues but
did not eliminate them. We still had the problem of unknown network
activity using up all the bandwidth. The next step was to find a compact
OS that allowed additional software to be installed. I considered
[Alpine Linux][alpine], but settled on [OpenWRT][openwrt]. OpenWRT fit
the bill perfectly. It was designed for embedded systems so the base
install was very small, was designed to run from CF, has a great little
package manager for adding an removing software, a large selection of
packages including an optional web UI and an easy to use build system
for building custom images and packages.
[alpine]: http://alpinelinux.org/
[openwrt]: https://openwrt.org/ [openwrt]: https://openwrt.org/
The recommnded installation method for OpenWRT on ALIX boards was to
build from source so that the ALIX specific configuration and kernel
modules can be selected. It took some time to produce an image that
I was happy with but after that it was a simple matter of writing the
image to a CF card and booting the ALIX board from it.
Out of the box OpenWRT was configured for separate WAN and LAN networks
like m0n0wall. Along with the base system I added the neat Lua based
[LuCI][luci] web UI, support for USB mass storage devices and iftop for
watching traffic on network interfaces.
[iftop]: http://www.ex-parrot.com/pdw/iftop/
[luci]: http://luci.subsignal.org/ [luci]: http://luci.subsignal.org/
[Lua]: http://www.lua.org/
The addition of iftop allowed the network traffic to be examined when After learning to use the excellent OpenWRT build system I was able to
our Internet connection appeared to be be flooded. I was able to determine build a custom CompactFlash image for the board to run. I also created a
that that in some cases the problem was Wi-Fi backup to iCloud on our package for my [weather logging software][weather-software] so that the
iPhones. ALIX can do all my [weather station][weather] logging.
There was still some instability with the ADSL though. I decided to
swap the modem I was using for another that allowed more control
and turned off everything except the ADSL modem functionality,
delegating all of that to the ALIX board including maintaining the <abbr
title="">PPPoE</abbr> connection. Since this change everything has been
running very smoothly.
With OpenWRT's great build and packaging system I was also able to build
a custom package for the weather logging software that communicates with
my [weather station][weather]. With this package installed the ALIX
board now does the logging instead of my Mac Pro, consuming vastly less
power in the process.
[weather]: /personal/2010/09/weather-station/ [weather]: /personal/2010/09/weather-station/
[weather-software]: /technical/2010/09/weather-station-software/
This setup has been extremely reliable. I've pushed all services on to
it that my ADSL modem and AirPort base station used to be responsible
for. Including maintaining the PPPoE connection to my ISP. I'd certainly
recommend a set up like this to anyone who is looking for a small
dedicated home router.
If you don't like the prospect of building your own custom OS image I'd
also highly recommend <tt>[m0n0wall]</tt>, which is a [FreeBSD] derived
router system. I ran this on the ALIX initially and it was very easy
to get up an running (write image to CF card, boot from card - default
settings worked fine but can be changed via a web UI) and very reliable.
[m0n0wall]: http://m0n0.ch/wall/
[FreeBSD]: http://www.freebsd.org/
<figure>
<img src="/images/2012/01/_MG_0562.jpg" width="600" height="258" alt="" />
<figcaption>Front with three LEDs. The behaviour of the LEDs can
be customised in OpenWRT. I have the left one indication power and
the middle one indicating activity on the WAN port. The other one is
currently unused.</figcaption>
</figure>
<figure>
<img src="/images/2012/01/_MG_0569.jpg" width="600" height="600" alt="" />
<figcaption>Top of case, showing size in comparison to a CD case.</figcaption>
</figure>
<figure>
<img src="/images/2012/01/_MG_0567.jpg" width="600" height="600" alt="" />
<figcaption>The ALIX board itself with the following connected: WAN
and LAN Ethernet, 8Gb [MosKeyto USB flash drive][moskeyto],
weather station USB cable and 32Mb CF card that the system runs
off.</figcaption>
</figure>
[moskeyto]: http://www.lacie.com/au/products/product.htm?id=10425

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--- ---
title: Little Linux Home Server Appliance title: Little Linux Router Box
extra: TODO extra: Solving my Internet connection issues with a PC Engines ALIX single board computer and OpenWRT.
kind: article kind: article
section: technical section: technical
created_at: 2011-12-08 17:54:00 created_at: 2012-01-21 15:33:00
keywords: keywords:
- alix - alix
- embedded - embedded
@ -11,3 +11,5 @@ keywords:
- openwrt - openwrt
- server - server
- appliance - appliance
- freebsd
- m0n0wall

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