The dual-IP line implementation is installed on a server with two network cards, access to telecommunications networks, cable and Netcom network cable and set up a network IP and Telecom IP, so that there are two IP addresses on a single server Netcom or telecommunications routing table on the server to add to Netcom users and telecommunications users access from a different line. Dual-IP lines commonly used in two ways: 1. ICP users set up on the site links to two different IP address, Netcom, the user clicks on Netcom's IP access servers, and telecommunications users click on the Telecom IP access. Two. BIND 9 (DNS server software) to return to a different server IP Netcom, a user requests a domain name back to Netcom's IP telecommunications users request the domain name back to Telecom's IP request to a different IP address, this way some smart IDC DNS programs. Dual-IP line to some extent, improve the speed of the Netcom and Telecom users to access the site, but the drawback is that the access server is dual NIC on the server routing table settings to the general user maintenance difficulty, and all data packets need to make a routing decision on the server and then sent to a different network card, when the visited server resource consumption. This program is the most simple two-wire solution is generally limited to the IDC smaller providers use.