In accordance with an embodiment method, a routing device obtains a plurality of IPv6 prefixes from a plurality of networks; determines a first IPv6 prefix from the plurality of IPv6 prefixes according to a first routing policy, and allocates the first IPv6 prefix to a terminal device; receives a first data service request including a first IPv6 address from the terminal device; determines, according to a second routing policy; determines a second IPv6 address based on the first IPv6 address and a second IPv6 prefix corresponding to the second network; and sends a second data service request including the second IPv6 address to the second network, where the first IPv6 address is determined by the terminal device based on the first IPv6 prefix and a local address, and the second network is any network other than the first network in the plurality of networks.

A device may receive, from a first network device, an authentication request that requests authentication of the device, and may provide, to the first network device, an authentication response that includes the authentication of the device. The device may provide, to the first network device and based on the authentication response, a PDU session establishment request that requests establishment of a PDU session for customer premises equipment, and may receive, from the first network device and based on the PDU session establishment request, a PDU session resource setup request that requests a resource to be established for the PDU session. The device may provide, to the first network device and based on the PDU session resource setup request, a PDU session resource setup response indicating that the resource is a GTP tunnel, and may establish the GTP tunnel with a second network device.

Techniques are described for managing communications between multiple computing nodes, such as for computing nodes that are part of managed virtual computer networks provided on behalf of users or other entities. In some situations, one or more of the computing nodes of a managed virtual computer network is configured to perform actions to extend capabilities of the managed virtual computer network to other computing nodes that are not part of the managed virtual computer network, such as by forwarding communications between computing nodes of the managed virtual computer network and the other external computing nodes so as to enable the other external computing nodes to participate in the managed virtual computer network. 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.