HP-UX IPv6 Transport Administrator's Guide for TOUR 2.0 (April 2004)

Features Overview
IPv6 Transport (bundled as part of TOUR 2.0)
Chapter 14
RFC 3056 - Connection of IPv6 Domains via IPv4 Clouds
IMPORTANT As a result of supporting RFC 2893, tunnel configuration on HP-UX IPv6
bundled as part of TOUR 2.0, requires specific changes from tunnel
configurations on previous HP-UX IPv6 releases. For detailed
information, including specific configuration instructions, refer to
relevant sections of Chapter 3, Configuration, of this guide.
SAM has not been enhanced to support the new tunneling enhancements
available with TOUR 2.0. TOUR 2.0 tunneling configuration must be
done by editing the /etc/rc.config.d/netconf-ipv6 file or by using
the ifconfig command.
• Configured tunneling is point-to-point with addresses
assigned to tunnel endpoints: In conformance with RFC 2893
(which obsoletes RFC 1933) configured tunnels are pseudo-interfaces
with associated addresses. Previously, when conforming to RFC
1933, tunnels were implemented using special routing entries. The
RFC 1933 implementation did not allow addresses to be associated
with tunnels and hence, routing protocol daemons were not able to
operate over tunnels. To overcome this problem, RFC 2893 specifies
tunnels as IPv6 interfaces and requires them to be configured with at
least (on primary interfaces) link-local addresses.
As a result, the process for configuring tunnels using the ifconfig
and route commands and the /etc/rc.config.d/netconf-ipv6
file is different than it was in previous HP-UX 11i v1 IPv6 releases
(TOUR 1.0 and IPv6NCF11i).
• HP-UX server can be configured as a router in a
point-to-point configured tunnel: You can configure tunneling
between the following network nodes: host->router; host->host;
router-> host; and router->router. In TOUR 2.0, the HP-UX server
can perform the role of the router in the tunnel configuration. Prior
to TOUR 2.0 (in TOUR 1.0 for HP-UX 11i v1 and in base (default)
HP-UX 11i v2), the HP-UX server could only perform the host role.
• HP-UX server can be configured as a “6to4” router: Starting
with TOUR 2.0, the HP-UX server can perform the role of a router in
a “6to4” configuration. Prior to TOUR 2.0, the HP-UX server was
only able to perform the role of a host in a “6to4” configuration.