A first request, to access a web site associated with a domain name, is obtained at a gateway router interposed between a local area network and an internet service provider's infrastructure, from a host on the local area network. The gateway router has Domain Name Service (DNS) resolver capability. The first request is received while the gateway router has upstream connectivity to the internet service provider's infrastructure via IPv6 but not via IPv4. Further steps include sending, from the gateway router, the first request; obtaining, at the gateway router, an indication that an IPv4 address will imminently be required for the gateway router; and, responsive to obtaining the indication, sending, from the gateway router, into the internet service provider's infrastructure, a second request, for an IPv4 address for the gateway router.