H.460

	H.460 H.460 is a series of extensions to the H.323 videoconferencing standard from the ITU. Introduced in 2005, several of the extensions, including H.460.17, H.460.18 and H.460.19, deal with firewall and NAT traversal Network address translation traversal is a computer networking technique of establishing and maintaining Internet Protocol connections across Gateway (telecommunications), gateways that implement network address translation (NAT). NAT traversal te .... For example, they enable end points to communicate with each other without the need of intermediate nodes. References {{reflist Teleconferencing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Firewall (computing) In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on configurable security rules. A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet or between several VLANs. Firewalls can be categorized as network-based or host-based. History The term '' firewall'' originally referred to a wall to confine a fire within a line of adjacent buildings. Later uses refer to similar structures, such as the metal sheet separating the engine compartment of a vehicle or aircraft from the passenger compartment. The term was applied in the 1980s to network technology that emerged when the Internet was fairly new in terms of its global use and connectivity. The predecessors to firewalls for network security were routers used in the 1980s. Because they already segregated networks, routers could filter packets crossing them. Before it was used in real-life comput ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	NAT Traversal Network address translation traversal is a computer networking technique of establishing and maintaining Internet Protocol connections across Gateway (telecommunications), gateways that implement network address translation (NAT). NAT traversal techniques are required for many network applications, such as peer-to-peer file sharing and voice over IP. Network address translation Network address translation typically uses private IP addresses on private networks with a single public IP address for the router facing the Internet. The network address translator changes the source address in network protocols for outgoing requests from that of an internal device to its external address, so that internal devices can communicate with hosts on the external network, while relaying replies back to the originating device. This leaves the internal network ill-suited for hosting services, as the NAT device has no automatic method for determining the internal host for which incoming packets fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]