Wireless computer networks have one or more access points that bridge network packets between computers connected over wireless links and a wired network backbone. The core functionality of each access point is implemented by its firmware. Tomato is a free, open-source alternative firmware for access points of many brands and models; it offers advanced capabilities such as configurable quality of service, commonly not provided in the manufacturer's firmware for consumer-level networking hardware. You can configure your Tomato access point to always assign the same static Internet Protocol (IP) address to a given device on your network.
Find out the Medium Access Control (MAC) address of the device that should get the static IP address. The exact way of doing this depends on the device. For example, for a computer running Windows, click "Start," then type "run" into the search box, then press "Enter" and click on "Run." Enter "cmd" into the newly-opened Run window and press Enter. Click on the newly-opened Command window and type
Press "Enter." The MAC address for the computer is the sequence of six hexadecimal values (e.g., "39-82-E4-F0-10-DD") listed under the "Physical Address" heading.
Log in to a computer connected to the access point. Launch a web browser by double-clicking on its desktop icon. Navigate to the web address for the Tomato configuration interface (the default is 192.168.1.1). The configuration utility will display on the browser.
Click on "Basic," then on "Static DHCP." Tomato will open new text entry fields immediately to the left of the "Static DHCP" label. Enter the MAC address from Step 1 under the "MAC Address" column, using colons to separate each hexadecimal value from the next. Enter the IP address you want to statically assign to the device under the "IP Address" column. Click "Add" at the bottom of the table. At that point, Tomato will be configured to assign the static IP address to the device in question.
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