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An ALG is very similar to a proxy server, as it sits between the client and real server, facilitating the exchange. There seems to be an industry convention that an ALG does its job without the application being configured to use it, by intercepting the messages. A proxy, on the other hand, usually needs to be configured in the client application.
Various NAT traversal techniques have been developed: NAT Port Mapping Protocol (NAT-PMP) is a protocol introduced by Apple as an alternative to IGDP. Port Control Protocol (PCP) is a successor of NAT-PMP. UPnP Internet Gateway Device Protocol (UPnP IGD) is supported by many small NAT gateways in home or small office settings. It allows a ...
NAT Port Mapping Protocol (NAT-PMP) is a network protocol for establishing network address translation (NAT) settings and port forwarding configurations automatically without user effort. [1] The protocol automatically determines the external IPv4 address of a NAT gateway, and provides means for an application to communicate the parameters for ...
With NAT, all communications sent to external hosts actually contain the external IP address and port information of the NAT device instead of internal host IP addresses or port numbers. NAT only translates IP addresses and ports of its internal hosts, hiding the true endpoint of an internal host on a private network.
Linux: x86-64: Proprietary: Paid hardware or virtual appliance: Router/firewall distribution. LEAF Project: Active: Linux distribution: x86? Free: linux Embedded Appliance Framework; a customizable embedded Linux network appliance used as an Internet gateway, router, firewall, and wireless access point. LibreCMC: Active Linux-libre: MIPS: GPLv2 ...
ICS provides NAT services, mapping individual IP addresses of local computers to unused port numbers in the sharing computer. Because of the nature of the NAT, IP addresses on the local computer are not visible on the Internet. All packets leaving or entering the LAN are sent from or to the IP address of the external adapter on the ICS host ...
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For the purpose of creating PCP requests, IP address of the server is either manually configured on the host, found as part of the host's DHCP lease, or set to the host's configured default gateway. Host request messages are sent from any source UDP port on a client to the server's UDP port 5351 that it listens to; unsolicited multicast server ...