1 © 2004 Cisco Systems, Inc. All rights reserved. Draft-vandevelde-v6ops-nap-00 Network Architecture Protection ( Gunter Van de Velde,

222 © 2004 Cisco Systems, Inc. All rights reserved. Draft-vandevelde-v6ops-nap-00 Motivation IPv4 NAT is widely used IPv4 NAT has perceived benefits NAT addressed initially address conservation IPv6 is the scalable answer to address depletion If IPv6 needs to adopted by the mass audience, then it should provide same benefits as IPv4 NAT and enhance those with superior IPv6 technology This document captures the perceived benefits of IPv4 NAT and explains how these can be achieved with native IPv6

Network Architecture Protection: “Collectively known IPv6 techniques that may be combined on an IPv6 site to simplify and protect the integrity of its network architecture, without the need for Address Translation 333 © 2004 Cisco Systems, Inc. All rights reserved. Presentation_ID

444 © 2004 Cisco Systems, Inc. All rights reserved. Draft-vandevelde-v6ops-nap-00 Perceived IPv4 benefits Simple Gateway Simple boundary Local usage tracking End-system privacy Topology hiding Addressing Autonomy Global Address pool conservation Renumbering Multihoming

555 © 2004 Cisco Systems, Inc. All rights reserved. Draft-vandevelde-v6ops-nap-00 Used IPv6 Tools Privacy addresses (RFC 3041) Unique Local Addresses (draft-ietf-ipv6-unique- local-addr-06 ) DHCPv6-PD (RFC 3633) Untraceable IPv6 addresses & Route-injection

666 © 2004 Cisco Systems, Inc. All rights reserved. Draft-vandevelde-v6ops-nap-00 IPv6 Mapping of the Market Perceived Benefits FunctionIPv4/NATIPv6 Simple GatewayDHCP – single address upstream DHCP – limited pool of individual devices downstream DHCP-PD – customer prefix upstream SLAAC via RA downstream Simple SecurityFiltering due to lack of translation stateContext Based Access Control (Reflexive ACL) Local usage trackingNAT state tableAddress uniqueness End system privacyNAT transforms device ID bits in the address Temporary use privacy addresses Topology hidingNAT transforms subnet bits in the addressUntracable addresses using IGP host routes /or MIPv6 tunnels for stationary devices Addressing AutonomyRFC 1918RFC 3177 & ULA Global Address Pool Conservation RFC ,282,366,920,938,463,463,374,607,431,768,211,456 addresses Renumbering and Multi- homing Address translation at borderPreferred lifetime per prefix & Multiple addresses per interface

777 © 2004 Cisco Systems, Inc. All rights reserved. Draft-vandevelde-v6ops-nap-00 Additional benefits by using IPv6 Universal connectivity Auto-configuration Native Multicast services Increased security protection Mobility Merging networks Community of Interest

888 © 2004 Cisco Systems, Inc. All rights reserved. Presentation_ID