st task that the IETF working group is tasked to do is to lay out an architecture document that outlines how to construct home networks involving multiple routers and subnets/segments, and without having NAT devices in between subnets. The architecture document [42] is expected to implement the IPv6 addressing architecture [43], prefix delegation [44], global and Unique Local Address (ULA) addresses SO that the home net- work could internally be still functional when access to the global Internet is temporarily lost, source address selection rules [10], internal routing, autoconfiguration (such as one proposal based on Open Shortest Path First version 3 (OSPFv3) [45]), and other existing components of the IPv6 architecture. Changes and improvement to existing standards are possible, when seen necessary. The router connecting the residential home network to the Internet is supposed to follow existing guidelines and requirements [41, 46]. 6.3.2 Homenet and 3GPP Architecture What does (wireline) residential home networks have in common with 3GPP wireless network access? It is likely, and has already happened on several occasions, that cellular Future of IPv6 in 3GPP Networks access technology will replace the wireline cable in Consumer Premises Equipments (CPEs). LTE specifically has enough bandwidth and reasonable roundtrip times to satisfy large groups of consumers, especially in emerging markets where deploying wireline Internet access might turn out to be far more troublesome than wireless. The addressing in home networks is very likely to be built on top of DHCPv6. The 3GPP added DHCPv6 Prefix Delegation support to its architecture starting from Release- 10. As we saw in Section 4.4.6, 3GPP DHCPv6 Prefix Delegation has some peculiarities [47] that might not be obvious for people with previous experience from deploying IPv6 on wireline networks. Furthermore, the lifetime of the delegated prefixes fate-share the wireless connection lifetime. As we know, wireless connections, even when stationary, tend to have hic