1. 24/10/2005 1 Point6 Pôle de compétences IPv6 en Bretagne Avec le soutien de : Softwires interim meeting L2TP tunnels Laurent Toutain Laurent.Toutain@enst-bretagne.fr

2. 24/10/2005 2 IPv6 in the home network (3/3) CPE v4 X Y Z IPv4 b r i d g e NAT PE v4 Home Network Clients with private IPv4 address CPE v6 IPv6 Prefix annoucement and IPv6 packet routing PE v6 Point6 Client Point6 Server

3. 24/10/2005 3 Connection scenario (1/3) CPE v4 L2TP IPv6 Server RADIUS server IPv4/v6 ISP PE v6 X Y Z FE80::X FE80::Y FE80::Z Point6 Client DHCPv6 server Authentication / Authorization Point6 client: IPv6 Router - L2TP client - DHCPv6 client b r i d g e IPv4 L2TP negotiation NAT CPE v6 PE v4 Clients with private IPv4 address and local IPv6 address

4. 24/10/2005 4 Software components Use standard protocols and open source software. ● Tunneling using L2TP (RFC2661) ● NAT-traversal (UDP) ● Already built-in features : ● Chap : user authentication ● IPv6CP : configuration of LL addresses ● LCP : in-line monitoring of tunnel ● Prefix delegation with DHCPv6-PD (RFC3633) ● Flexible prefix assignement to clients ● Automatic prefix delegation on CPE ● AAA with RADIUS (RFC2865) ● AAA linked to PPP

5. 24/10/2005 5 What’s next Point6box fulfills softwire problem statement for hub and spoke: ● Point6box is software initiator / PEv6 is SC (scenario 3) ● Software can be included to HGW (scenario 1) Write a WG ID to specify the use of L2TP tunnels for hub and spoke ? Until where to go ? ● Assignment of LL address ? Global address ? ● Prefix delegation (may be a more generic issue)

6. 24/10/2005 6 Connection scenario (2/3) L2TP IPv6 Server RADIUS server IPv4/v6 ISP X Y Z FE80::X FE80::Y FE80::Z Point6 Client DHCPv6 server NAT Clients with private IPv4 address and local IPv6 address IPv4 b r i d g e A:B:C::IID RA A:B:C::6boxID Connexion Accounting L2TP tunnel IPv6 CPE v4 PE v6 CPE v6 PE v4

7. 24/10/2005 7 Connection scenario (3/3) Connexion Accounting L2TP tunnel RADIUS server X Y Z FE80::X FE80::Y FE80::Z L2TP IPv6 Server IPv4/v6 ISP Point6 Client DHCPv6 server NAT IPv4 DHCPv6 request and reply b r i d g e IPv6 RADIUS authorization DHCPv6 relay CPE v4 PE v6 CPE v6 PE v4 Stateless autoconf using RA mechanism A:B:D:101::X A:B:D:101::Y A:B:D:101::Z A:B:D:101::1

8. 24/10/2005 8 What’s next Do we need to document PPP/DHCPv6 interaction ? Study prefix delegation in Hub and Spoke architecture ● Linked to IPv4 Software Concentrator discovery AAA is a way to manage Softwire Concentrators ● Define missing parameters : ● draft-stevant-softwire-accounting-00.txt