Abstract: When a communication device receives a request of connection, the communication device selects a destination address from multiple destination addresses according to data provided by a server. After a destination address is selected from the multiple destination addresses, the communication device connects a source address and the selected destination address.

Abstract: A network device connects an internet and an intranet. The network device includes a receiving module, a downloading module and a determining module. In this case, the receiving module receives a download request transmitted via the intranet. The downloading module downloads at least one data via the internet according to the download request. The determining module determines if the receiving module receives a connect request transmitted via the intranet, wherein the downloading module slows the rate of downloading the data or pauses downloading the data while the receiving module receives the connect request transmitted via the intranet.