Introduction to Networking for NonStop NS-Series Servers (H06.03+, J06.03+)

Networking Concepts
Introduction to Networking for HP Integrity NonStop NS-Series Servers—529874-003
2-5
IPv6
it. Administrators for firewalls managing the connectivity for a large number of hosts
have a heavy responsibility.
IPv6
The IPv6 protocol extends the IP address to 128 bits compared to the 32 bits of IPv4
addresses. The NonStop TCP/IPv6 subsystem provides IPv6 functionality on the
Integrity NonStop server using three modes of operation: pure IPv6, in which the
system supports only IPv6 communications, dual, in which the system supports both
IPv4 and IPv6 communications, and pure IPv4, in which the system provides only IPv4
communications.
Much of the Internet consists of IPv4 networks; an IPv6-enabled system can
communicate across IPv4 networks by using tunneling. IPv6 tunneling requires an IPv4
address on both ends of the communication; IPv6 packets are then encapsulated in
IPv4 packets so that they can be transmitted across an IPv4 network. 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. Figure 2-1 depicts an IPv6 tunneling scenario.
Because of the parallel TCP/IP architecture of the NonStop TCP/IPv6 product, you
may want to use it even if you only want IPv4 communications; in this case, just
configure the NonStop TCP/IPv6 subsystem in INET mode.
For more information about IPv6 on the Integrity NonStop server, see the TCP/IPv6
Configuration and Management Manual.
Figure 2-1. IPv6 Tunneling
Host, Dual Mode
(IPv4 and IPv6)
172.14.215.27
VST134.vsd
Tunnel
IPv4 Host
IPv6 Host
IPv4/6 Network
Encapsulated packets