The Linksys WRT54G is a 54 Mbps router that provides quick, secure and high-speed wireless Internet access to multiple devices. Featuring wireless encryption, this Linksys wireless G router prevents unauthorized access to your wireless network. This 54 Mbps router supports MAC address filtering, which lets you specify the IP addresses to be allowed in your network, thus preventing unauthorized access. The SPI firewall in this Linksys wireless G router provides robust wireless security from a wide array of common hacker attacks. Moreover, the four Mbps Ethernet ports in the Linksys WRT54G facilitate multiple full-duplex wired connections for building a small wired network.