Abstract: This invention provides a method, apparatus, and computer-readable media for providing a configuration that sets up and maintains communication connections through the use of network address translation (NAT). The configuration includes communicating, by a device, packets from and/or to another device, in which the communication involves a network address translation, and maintaining the network address translation by transmitting, by the device, packets using the network address translation frequently enough to prevent any intermediate device from deleting a mapping for the network address translation from a cache of the intermediate device.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.

Abstract: A method, apparatus, and computer-readable media are presented that provide a configuration that sets up and maintains communication connections through the use of Network Address Translation. The configuration includes communicating, by a device, packets from and/or to another device, in which the communication involves a network address translation, and maintaining the network address translation by transmitting, by the device, packets using the network address translation frequently enough to prevent any intermediate device from deleting a mapping for the network address translation from a cache of the intermediate device.

Abstract: A method, apparatus, and computer-readable media are presented that provide a configuration for communications through network address translation. The configuration includes receiving, by a computer device, a packet comprising a predetermined value indicating support by a node for an extension of a communications protocol, wherein the communications protocol is used for communications across a network translator device and the extension is capable of traversing network address translation, and in response to said receiving, determining that the node sending the packet supports the extension of the communications protocol.

Abstract: A method, apparatus, and computer-readable media are presented that provide a configuration for communications through network address translation. The configuration includes receiving, by a computer device, a packet comprising a predetermined value indicating support by a node for an extension of a communications protocol, wherein the communications protocol is used for communications across a network translator device and the extension is capable of traversing network address translation, and in response to said receiving, determining that the node sending the packet supports the extension of the communications protocol.

Abstract: A method, apparatus, and computer-readable media are presented that provide a configuration for communications through network address translation. The configuration includes transmitting, by a first computer device, a packet that includes a predetermined value indicating that the first computer device supports an extension of a communications protocol, wherein the communications protocol is used for communications across a network translator device and the extension is capable of traversing network address translation.

Abstract: A method, apparatus, and computer-readable media are presented that provide a configuration for revealing occurrence of network address translation by receiving a packet that includes an encoding of a source port number and then determining whether a network address translation occurred on the packet by comparing the source port number against a predetermined port number.

Abstract: A method, apparatus, and computer-readable media are presented that provide a configuration for communicating by a computer device with another computer device wherein network address translation that translate address information in packet headers can occur between the computer devices, and revealing, by the computer device to the other computer device, address information as seen by the computer device on its side of the network address translation, by including in a payload of a packet transmitted to the other computer device, an encoding of the address information as seen by the computer device.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.

Abstract: A method and apparatuses are disclosed for handling digital data packets at a logical borderline that separates an untrusted packet-switched information network from a protected domain. A packet processor part intercepts a packet that is in transit between the untrusted packet-switched information network and the protected domain. The packet is examined at the packet processor part in order to determine, whether the packet contains digital data that pertains to a certain protocol. If the packet is not found to contain such digital data, it is processed at the packet processor part. If the packet is found to contain digital data that pertains to said certain protocol, it gets redirected to an application gateway part that processes the packet according to a set of processing rules based on obedience to said certain protocol. The packet processor part is a kernel mode process running in a computer device and the application gateway part is a user mode process running in a computer device.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.

Abstract: This invention provides a method for providing network security services, such as those provided by the IPSEC protocol, through network address translation (NAT). The method is based on determining the transformations that occur on a packet and compensating for the transformations. Because only TCP and UDP protocols work through NATs, the IPSEC AH/ESP packets are encapsulated into UDP packets for transport. Special operations are performed to allow reliable communications in such environments.