ifconfig.1m (2010 09)

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ifconﬁg(1M) ifconﬁg(1M)

tsrc addr Specify the source addr of the tunnel. This is the source address in the

encapsulating (outer) header. It should be an unicast address conﬁgured

on an interface in the tunnel entry-point node. For tunnel types

ipinip6 and ip6inip6, the addr should be an IPv6 address. For tun-

nel types ip6inip and 6to4, the addr should be an IPv4 address.

arp (inet only) Enable the user of the Address Resolution Protocol in map-

ping between network level addresses and link level addresses (default).

If an interface already had the Address Resolution Protocol disabled, the

user must "unplumb" the interface before it can be enabled for Address

Resolution Protocol.

-arp (inet only) Disable the use of the Address Resolution Protocol. If an

interface already had the Address Resolution Protocol enabled, the user

must "unplumb" the interface before it can be disabled for Address Reso-

lution Protocol.

plumb Setup the Streams plumbing needed for TCP/IP for a primary interface

name. (See the Interface Naming subsection given below.). By default,

the plumb operation is done automatically when an IP address is

speciﬁed for an interface.

unplumb Tear down the Streams plumbing for a primary interface name. (See the

Interface Naming subsection given below.) Secondary interface does not

require "plumbing". A secondary IPv4 interface can be removed by

assigning an IP address of 0.0.0.0 to it. Remove a secondary IPv6 inter-

face by assigning an IP address of :: to it.

Interface Naming

The interface name associated with a network card is composed of the name of the interface (e.g.

lan or

snap ), the ppa number which identiﬁes the card instance for this interface, and an optional IP index

number which allows the conﬁguration of multiple IP addresses for an interface. For LAN cards, the

interface name

lan will be used to designate Ethernet encapsulation and

snap for IEEE 802.3 encapsu-

lation. The

nwmgr and lanscan commands can be used to display the interface name and ppa number

of each interface that is associated with a network card (see nwmgr(1M) and lanscan (1M)).

IPv4 and IPv6 interfaces can coexist over the same physical network interface device using the same

naming scheme. IPv6 interfaces are conﬁgured using the "inet6" ifconﬁg subcommand. (See the IPv6

subsection given below.)

The tunnel interface names should be

iptu* for "IP6-in-IP" tunnels and 6to4 tunnels. Example:

iptu0, iptu1. The tunnel interface names should be ip6tu* for "IP-in-IP6" tunnels and "IP6-in-IP6"

tunnels. Example: ip6tu0, ip6tu1.

IP Index Number

Multiple IP addresses assigned to the same interface may be in different subnets. An example of an inter-

face name without an IP index number is

lan0. An example of an interface name with a IP index

number is lan0:1. Note: specifying lan0:0 is equivalent to lan0.

A primary interface is an interface whose IP index number is zero. A secondary interface is an interface

whose IP index number is non-zero.

Loopback Interface

The loopback interface (lo0) is automatically conﬁgured when the system boots with the TCP/IP

software. The IP address and netmask of the primary IPv4 loopback interface are 127.0.0.1 and

255.0.0.0, respectively. The IP address and preﬁx of the primary IPv6 loopback interface are ::1 and 128

respectively. The user is not permitted to change the address of the primary loopback interface (lo0:0).

It is permissible to assign other IP addresses to lo0 with non-zero IP index numbers (lo0:1, lo0:2, etc).

This allows a system to have a "system IP" address that is available as long as one interface remains

usable.

Supernets

(inet only) A supernet is a collection of smaller networks. Supernetting is a technique of using the net-

mask to aggregate a collection of smaller networks into a supernet.

HP-UX 11i Version 3: September 2010 − 3 − Hewlett-Packard Company 3