Pr

1
Point6 Pôle de compétences IPv6 en Bretagne
Softwires interim meeting L2TP tunnels
Laurent Toutain Laurent.Toutain_at_enst-bretagne.fr
Avec le soutien de
2
IPv6 in the home network (3/3)
X
CPE v4
PE v4
Y
NAT
Z
Clients with private IPv4 address
Home Network
3
Connection scenario (1/3)
FE80X
X
CPE v6
CPE v4
FE80Y
Point6 Client
Y
NAT
FE80Z
Z
PE v4
IPv4/v6 ISP
Clients with private IPv4 address and local IPv6
address
PE v6
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
Whats 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
Connection scenario (2/3)
FE80X
X
CPE v6
CPE v4
Point6 Client
FE80Y
Y
NAT
FE80Z
Z
PE v4
IPv4/v6 ISP
Clients with private IPv4 address and local IPv6
address
PE v6
7
Connection scenario (3/3)
Connexion Accounting
L2TP tunnel
FE80X
X
CPE v6
CPE v4
Point6 Client
FE80Y
Y
IPv6
NAT
FE80Z
Z
PE v4
IPv4/v6 ISP
PE v6
8
Whats 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