HP-UX Reference (11i v2 03/08) - 1M System Administration Commands A-M (vol 3)

ifconﬁg(1M) ifconﬁg(1M)

manually conﬁgures secondary interfaces.

To disable communication through a speciﬁc IP address on an autoconﬁgured secondary interface, that

secondary interface should be marked down, not removed or overwritten with a different IP address. If

that interface is removed or overwritten, the host will reconﬁgure another secondary interface with the

same IP address when it receives the next router advertisement. Alternatively, the router can be

conﬁgured to stop advertising the preﬁx that corresponds to the offending IP address.

Tunneling interface:

The tunneling interface, tu0, enables both automatic and conﬁgured tunneling when it is marked up.

Tunneling allows dual stack IPv6/IPv4 nodes to communicate over IPv4 routing infrastructures, by encap-

sulating the IPv6 packet inside an IPv4 packet. In automatic tunneling, the tunnel endpoint address is

determined by the IPv4-compatible destination address of the IPv6 packet being tunneled. In conﬁgured

tunneling, the tunnel endpoint address is conﬁgured by the user (see route(1M)).

IPv6 interface flags displayed:

An IPv6 interface may have three new ﬂags that are not present in an IPv4 interface: TUNNEL, AUTO,

and ONLINK. The TUNNEL ﬂag is set for the tunnel interface (tu0). The AUTO ﬂag is set for

autoconﬁgured secondary interfaces. The ONLINK ﬂag is set for interfaces with IP addresses that can be

reached without going through a router.

Examples:

Stateless address autoconfiguration with link-local address

ifconfig lan0 inet6 up

Manual configuration for a primary interface with link-local address

ifconfig lan0 inet6 fe80::1 up

Manual configuration for a secondary interface with link-local address

ifconfig lan0:1 inet6 fe80::3 up

Manual configuration for a secondary interface with site-local address

ifconfig lan0:2 inet6 fec0::6 up

Manual configuration for a secondary interface with global address

ifconfig lan0:3 inet6 2222::4 up

Tunnel interface configuration

ifconfig tu0 inet6 up

DIAGNOSTICS

Messages indicate if the speciﬁed interface does not exist, the requested address is unknown, or the user

is not privileged and tried to alter an interface’s conﬁguration.

AUTHOR

ifconfig was developed by HP and the University of California, Berkeley.