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Internet Gateway Device (IGD) Standardized Device Control Protocol is a protocol for mapping ports in network address translation (NAT) setups, supported by a certain number of NAT-enabled routers. It is a common communications protocol of automatically configuring port forwarding, and is part of an ISO/IEC Standard 〔 ISO/IEC 29341, http://www.iso.org/iso/home/news_index/news_archive/news.htm?refid=Ref1185〕 rather than an Internet Engineering Task Force standard. == Usage == Applications using peer-to-peer networks, multiplayer gaming, and remote assistance programs need a way to communicate through home and business gateways. Without IGD one has to manually configure the gateway to allow traffic through, a process which is error prone and time consuming. Universal Plug and Play (UPnP) comes with a solution for network address translation traversal. IGD makes it easy to do the following: * Learn the public (external) IP address * Requesting for a new public IP address * Enumerate existing port mappings * Add and remove port mappings * Assign lease times to mappings The host can allow to seek for available devices on the network via SSDP which can be controlled then with the help of a network protocol as SOAP. A seek request is sent via HTTP and port 1900 to the multicast address 239.255.255.250: M-SEARCH * HTTP/1.1 Host:239.255.255.250:1900 ST Man:"ssdp:discover" MX:3 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Internet Gateway Device Protocol」の詳細全文を読む スポンサード リンク
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