DD-WRT

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DD-WRT

DD-WRT is an opensource linux based firmware for Linksys WRT54G and similar 802.11g wireless routers.

• Homepage og DD-WRT
• What is DD-WRT
• List of Supported Hardware
• Using VPN with DD-WRT

• DD-WRT Tutorial 4: Defining Priorities with QoS

Wiviz, an open source GPL project, allows you to use your WRT to see other networks. It scans for networks and then shows signal strength and effects of antenna adjustment in real time.

• Wiwiz

Redirect all SMTP traffic to your internet providers SMTP server

Let DD-WRT redirect SMTP traffic to a valid SMTP server so everyone on your net can send mail

How DD-WRT routes traffic

To get a better understanding on how DD-WRT routes traffic, you can read:

• [http://iptables-tutorial.frozentux.net/iptables-tutorial.html Oskar Andreasson's Iptables Tutorial 1.2.2

If you are interested it tells how to show routing information:

To list your currently active rule-set: iptables -L

This command should list your currently active rule-set, and translate everything possible to a more readable form. For example, it will translate all the different ports according to the /etc/services file as well as DNS all the IP addresses to get DNS records instead. The latter can be a bit of a problem though. For example, it will try to resolve LAN IP addresses, i.e. 192.168.1.1, to something useful. 192.168.0.0/16 is a private range though and should not resolve to anything and the command will seem to hang while resolving the IP. To get around this problem we would do something like the following:

iptables -L -n

Another thing that might be interesting is to see a few statistics about each policy, rule and chain. We could get this by adding the verbose flag. It would then look something like this:

iptables -L -n -v

Don't forget that it is also possible to list the nat and mangle tables. This is done with the -t switch, like this:

iptables -L -t nat

There are also a few files that might be interesting to look at in the /proc file system. For example, it might be interesting to know what connections are currently in the conntrack table. This table contains all the different connections currently tracked and serves as a basic table so we always know what state a connection currently is in. This table can't be edited and even if it was possible, it would be a bad idea. To see the table you can run the following command:

cat /proc/net/ip_conntrack | less

The above command will show all currently tracked connections even though it might be a bit hard to understand everything.

Virtual Interfaces multiple SSID's

• Implementing Inexpensive Multiple SSID Networks
• Configure Multiple SSIDs with One Router

Wireless Access Point

• Set up your router as Wireless Access Point

Netgear WNDR3700 and DD-WRT

• Router Database
• Netgear WNDR3700 DD-WRT Wiki
• WNDR3700: Restore Factory Firmware in Five Easy Steps

Extend the range of your wireless network

Commercial antenna

• 2.4GHz 24dBi Grid Parabolic Antenna TL-ANT2424B
• Pigtail Cable TL-ANT24PT
• Pigtail Adapter for Outdoor Antennas WLE-LNC MC to N-Type Female adapter

Do it yourself antenna

• Cantenna - Wikipedia
• How To Build A Tin Can Waveguide WiFi Antenna
• Tin Cantenna with a satellite dish as an IEEE 802.11 Wireless Networking Antenna
• Antenna on the Cheap (er, Chip)
• How To Make A WiFi Antenna Out of A Pringles Can
• Spreadsheet for optimum can size calculation]
• The W1GHZ Online Microwave Antenna Book

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