4-Port MDIX Switch The P-324 features a 4-port 10/100Mbps switch for local network connections. The MDIX feature automatically and transparently detects wired cables, making network installation easy and manageable. SUA/NAT Technology ZyNOS, ZyXEL's proprietary networking software allows multiple users to share a single ISP account. DHCP Client/Server The P-324 behaves as a DHCP client to obtain an IP address from ISP servers when the link is up. It also serves as a DHCP server on the LAN to provide IP addresses to local computers. Secured Firewall Protection Based on Stateful Packet Inspection, Denial of Service (DoS) and Attack Alert, the P-324 provides the first line of defense against hackers, network intruders, and other hazardous threats. Traffic Redirect and Dial Backup for Broadband Backup Connections The P-324 offers users increased reliability by supporting Fail-Over and Fail-Back technology. Fail-Over and Fail-Back technology forward WAN port traffic to backup ISDN or Analog modems in the event of WAN port connection failure. Once WAN port connections are reestablished, traffic automatically returns. An additional gateway may also be connected to the P-324 to ensure High-Availability of the Internet. P-324 backup features increase reliability while decreasing device maintenance, IT consulting costs, and daily operation losses.