HP-UX IPv6 Transport Administrator Guide HP-UX 11i v3 (5992-6426, May 2013)

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 base (default) HP-UX 11i v2.
◦ 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. The HP-UX server can perform the
role of the router in the tunnel configuration.
◦ HP-UX server can be configured as a “6to4” router: The HP-UX server can perform
the role of a router in a “6to4” configuration. Prior to HP-UX 11i v2 PI, the HP-UX
server was only able to perform the role of a host in a “6to4” configuration.
◦ IP6-in-IP6 and IP-in-IP6 Support: Two additional tunneling types are supported,
IP6-in-IP6 and IP-in-IP6. IP6-in-IP6 tunnel configuration allows transmission of IPv6
packets encapsulated in an IPv6 header. IP-in-IP6 tunnel configuration allows
transmission of IPv4 packets encapsulated in an IPv6 header.
IP6-in-IP tunnel configuration allows transmission of IPv6 packets encapsulated
in an IPv4 header. IP6-in-IP represents the tunneling scenario where isolated IPv6
domains are communicating across IPv4 networks.
◦ Automatic Tunneling using IPv4-compatible addresses is no longer supported:
Automatic Tunneling using the special IPv6 address type known as
“IPv4-compatible address”, is not supported.
• IPv6/IPv4 Dual Stack support: HP-UX 11i v2 IPv6 supports both IPv4 and IPv6
applications. Programmers can write IPv6 applications that communicate with both
IPv6 and IPv4 peers. Existing IPv4 applications do not need to be modified.
• IPv6 tunneling enables IPv6/IPv4 hosts and routers to connect with other IPv6/IPv4
hosts and routers over the existing IPv4 network. IPv6 tunneling encapsulates IPv6
datagrams within IPv4 packets. The encapsulated packets travel across an IPv4
network until they reach their destination host or router. The IPv6-aware host or router
decapsulates the IPv6 datagrams, forwarding them as needed. IPv6 tunneling eases
IPv6 deployment by maintaining compatibility with the large existing base of IPv4
hosts and routers.
• Fully supports Ethernet Links and FDDI links.
• MC/ServiceGuard Enablement for IPv6 support.
• IPv6 Stateless Address Autoconfiguration.
• IPv6 Neighbor Discovery.
• TCP/UDP over IPv6, PMTUv6, ICMPv6, IPv6 MIBs and Sockets APIs.
20 Features Overview