A method for a client device to obtain an IP address in order to access a network resource via at least one IP network. The method includes: inserting, in a request for obtaining an IPv6 address in order to access the network resource intended for a DNS server, a piece of information representing an IP address type expected by the client device of the DNS server in response to the obtaining request if the network resource has an IPv4 connectivity; and sending the obtaining request to the DNS server.

A method for a client device to obtain an IP address in order to access a network resource via at least one IP network. The method includes: inserting, in a request for obtaining an IPv6 address in order to access the network resource intended for a DNS server, a piece of information representing an IP address type expected by the client device of the DNS server in response to the obtaining request if the network resource has an IPv4 connectivity; and sending the obtaining request to the DNS server.

Methods and apparatus, including computer program products, are provided for communications. In one aspect there is provided a method. The method may include sending, by a gateway, an advertisement including an internet protocol version 6 over low power wireless personal area network context option carrying a well-known prefix, the well-known prefix indicating to a node that the gateway provides an uplink in accordance with internet protocol version 4; and receiving, at the gateway, a first packet received via the wireless network in accordance with internet protocol version 6, the first packet including a destination address in accordance with internet protocol version 4. Related apparatus, systems, methods, and articles are also described.

Some embodiments of the invention provide a novel network architecture for advertising routes in an availability zone (AZ). The novel network architecture includes a set of route servers for receiving advertisements of network addresses as being available in the AZ from different routers in the AZ. The novel network architecture also includes multiple host computers that each execute a router that (i) identifies network addresses available on the host computer, (ii) sends advertisements of the identified network addresses to the set of route servers, and (iii) receives advertisements from the set of route servers regarding network addresses available on other host computers. The identified network addresses, in some embodiments, include at least one of network addresses associated with data compute nodes (DCNs) and network addresses associated with services available at the host computer. The route servers advertise the received network addresses to other routers in the AZ.

Some embodiments of the invention provide a novel network architecture for providing edge services of a virtual private cloud (VPC) at host computers hosting machines of the VPC. The host computers in the novel network architecture are reachable from external networks through a gateway router of an availability zone (AZ). The gateway router receives a data message from the external network addressed to one or more data compute nodes (DCNs) in the VPC and forwards the data message to a particular host computer identified as providing a distributed edge service for the VPC. The particular host computer, upon receiving the forwarded data message, performs the distributed edge service and provides the serviced data message to a destination DCN.

Techniques are described for managing communications between multiple computing nodes, such as computing nodes that are separated by one or more physical networks. In some situations, the techniques may be used to provide a virtual network between multiple computing nodes that are separated by one or more intermediate physical networks, such as from the edge of the one or more intermediate physical networks by modifying communications that enter and/or leave the intermediate physical networks. In some situations, the computing nodes may include virtual machine nodes hosted on one or more physical computing machines or systems, such as by or on behalf of one or more users (e.g., users of a program execution service). The managing of the communications may include determining whether communications sent to managed computing nodes are authorized, and providing the communications to the computing nodes only if they are determined to be authorized.

A method for managing a communication according to a transport protocol of a terminal equipment in a communication network. The method includes: detecting presence, on a path allowing the terminal equipment to be reached on a second IP address of the terminal equipment, of a status function which maintains a status associated with a communication on the path, including transmitting a first message from a first IP resource of the terminal equipment, including a first IP address and a first port number, to a second IP resource of the terminal equipment, including the second IP address and a second port number, and deciding on presence of a status function on the path according to data received by the second IP resource in response the first message; and managing a communication of the terminal equipment on the path allowing the terminal equipment to be reached on the second IP address.

A method for managing a communication according to a transport protocol of a terminal equipment in a communication network. The method includes: detecting presence, on a path allowing the terminal equipment to be reached on a second IP address of the terminal equipment, of a status function which maintains a status associated with a communication on the path, including transmitting a first message from a first IP resource of the terminal equipment, including a first IP address and a first port number, to a second IP resource of the terminal equipment, including the second IP address and a second port number, and deciding on presence of a status function on the path according to data received by the second IP resource in response the first message; and managing a communication of the terminal equipment on the path allowing the terminal equipment to be reached on the second IP address.

Techniques are described for managing communications between multiple computing nodes, such as computing nodes that are separated by one or more physical networks. In some situations, the techniques may be used to provide a virtual network between multiple computing nodes that are separated by one or more intermediate physical networks, such as from the edge of the one or more intermediate physical networks by modifying communications that enter and/or leave the intermediate physical networks. In some situations, the computing nodes may include virtual machine nodes hosted on one or more physical computing machines or systems, such as by or on behalf of one or more users (e.g., users of a program execution service). The managing of the communications may include determining whether communications sent to managed computing nodes are authorized, and providing the communications to the computing nodes only if they are determined to be authorized.

Techniques are described for managing communications between multiple computing nodes, such as computing nodes that are separated by one or more physical networks. In some situations, the techniques may be used to provide a virtual network between multiple computing nodes that are separated by one or more intermediate physical networks, such as from the edge of the one or more intermediate physical networks by modifying communications that enter and/or leave the intermediate physical networks. In some situations, the computing nodes may include virtual machine nodes hosted on one or more physical computing machines or systems, such as by or on behalf of one or more users (e.g., users of a program execution service). The managing of the communications may include determining whether communications sent to managed computing nodes are authorized, and providing the communications to the computing nodes only if they are determined to be authorized.