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ifconfig(1M)		System Administration Commands		  ifconfig(1M)

NAME
       ifconfig	- configure network interface parameters

SYNOPSIS
       /sbin/ifconfig  interface [address_family] [ address  [/prefix_length]
       [dest_address]] [ addif	address	  [/prefix_length]]  [	removeif   ad-
       dress   [/prefix_length]] [arp |	-arp]  [auth_algs authentication algo-
       rithm] [encr_algs encryption algorithm]	[encr_auth_algs	authentication
       algorithm]  [auto-revarp]  [  broadcast	address] [deprecated | -depre-
       cated]  [ destination  dest_address] [  [failover]  |  [-failover]]   [
       group  [	 [name]	 |  ""]	] [ index   {if_index}]	[ metric  n] [modlist]
       [modinsert mod_name@pos]	[modremove mod_name@pos] [ mtu	n] [  netmask
       mask] [plumb] [unplumb] [private	| -private]  [nud | -nud]  [ set  [ad-
       dress]  [/netmask]] [ [standby] |  [-standby]]	[  subnet   subnet_ad-
       dress]  [ tdst  tunnel_dest_address] [ token   address/prefix_length] [
       tsrc  tunnel_src_address] [trailers | -trailers]	 [up] [down]  [xmit  |
       -xmit]

       /usr/sbin/ifconfig   interface	[address_family]   [  address	[/pre-
       fix_length]  [dest_address]] [ addif  address  [/prefix_length]]	[  re-
       moveif  address	[/prefix_length]] [arp | -arp]	[auth_algs authentica-
       tion algorithm]	[encr_algs encryption  algorithm]  [encr_auth_algs au-
       thentication algorithm] [auto-revarp] [ broadcast  address] [deprecated
       |  -deprecated]	 [   destination    dest_address]   [	[failover]   |
       [-failover]]   [	group [	[name] | ""] ] [ index	 {if_index}] [ metric
       n] [modlist] [modinsert mod_name@pos] [modremove	mod_name@pos]  [  mtu
       n]  [  netmask	mask]  [plumb]	[unplumb] [private | -private]	[nud |
       -nud]  [	set  [address]	[/netmask]] [ [standby]	| [-standby]]  [  sub-
       net   subnet_address]  [	 tdst	tunnel_dest_address]  [	 token	   ad-
       dress/prefix_length] [ tsrc  tunnel_src_address]	[trailers | -trailers]
       [up] [down] [xmit | -xmit]

       /sbin/ifconfig	interface  {auto-dhcp  | dhcp}	[primary] [ wait  sec-
       onds]  drop | extend | inform | ping | release |	start |	status

       /usr/sbin/ifconfig  interface {auto-dhcp	 |  dhcp}   [primary]  [  wait
       seconds]	 drop |	extend | inform	| ping | release | start | status

DESCRIPTION
       The  command  ifconfig is used to assign	an address to a	network	inter-
       face and	to configure network interface parameters. The	ifconfig  com-
       mand  must  be  used at boot time to define the network address of each
       interface present on a machine; it may also be used at a	later time  to
       redefine	 an  interface's  address or other operating parameters. If no
       option is specified, ifconfig displays the current configuration	for  a
       network	interface. If an address family	is specified, ifconfig reports
       only the	details	specific to that address family.  Only	the  superuser
       may  modify the configuration of	a network interface. Options appearing
       within braces ({}) indicate that	one of the options must	be specified.

       The two versions	of ifconfig,  /sbin/ifconfig  and  /usr/sbin/ifconfig,
       behave  differently  with  respect to name services. The	order in which
       names are looked	up by /sbin/ifconfig when the  system  is  booting  is
       fixed  and  cannot be changed. In contrast, changing /etc/nsswitch.conf
       may affect the behavior of /usr/sbin/ifconfig. The system administrator
       may  configure  the  source and lookup order in the  tables by means of
       the name	service	switch.	See  nsswitch.conf(4) for more information.

   DHCP	Configuration
       The third and fourth forms of this command are used to control the  Dy-
       namic  Host  Configuration  Protocol ("DHCP") configuring of the	inter-
       face. DHCP is only available on interfaces for which the	address	family
       is  inet. In this mode, ifconfig	is used	to control operation of	dhcpa-
       gent(1M), the DHCP client daemon. Once an  interface  is	 placed	 under
       DHCP control by using the start operand,	ifconfig should	not, in	normal
       operation, be used to modify the	address	or characteristics of the  in-
       terface.	 If  the address of an interface under DHCP is changed,	dhcpa-
       gent will remove	the interface from its control.

OPTIONS
       The following options are supported:

       addif address
	     Create the	next unused logical interface on the specified	physi-
	     cal interface.

       arp   Enable the	use of the Address Resolution Protocol ("ARP") in map-
	     ping between network level	addresses  and	link  level  addresses
	     (default).	This is	currently implemented for mapping between IPv4
	     addresses and 10Mb/s Ethernet addresses.

       -arp  Disable the use of	the ARP.

       auth_algs authentication	algorithm
	     For a tunnel, enable IPsec	AH with	the  authentication  algorithm
	     specified.	 The  algorithm	can be either a	number or an algorithm
	     name, including any to express no preference  in  algorithm.  All
	     IPsec  tunnel  properties	must  be specified on the same command
	     line. To disable tunnel security, specify an auth_alg of none.

       auto-dhcp
	     Use DHCP to automatically acquire an address for this  interface.
	     This option has a completely equivalent alias called dhcp.

	     primary
		   Defines  the	interface as the primary. The interface	is de-
		   fined as the	preferred one for the delivery of  client-wide
		   configuration  data.	 Only one interface can	be the primary
		   at any given	time. If another interface is subsequently se-
		   lected  as the primary, it replaces the previous one. Nomi-
		   nating an interface as the primary one will not  have  much
		   significance	 once  the  client work	station	has booted, as
		   many	applications will already have started and  been  con-
		   figured with	data read from the previous primary interface.

	     wait seconds
		   The	ifconfig  command will wait until the operation	either
		   completes or	for the	interval specified, whichever  is  the
		   sooner.  If no wait interval	is given, and the operation is
		   one that cannot complete immediately, ifconfig will wait 30
		   seconds  for	the requested operation	to complete.  The sym-
		   bolic value forever may be used as well, with obvious mean-
		   ing.

	     drop  Remove the specified	interface from DHCP control. Addition-
		   ally, set the IP address to zero and	mark the interface  as
		   "down".

	     extend
		   Attempt  to	extend	the  lease on the interface's IPv4 ad-
		   dress. This is not required,	as the	agent  will  automati-
		   cally extend	the lease well before it expires.

	     inform
		   Obtain  network  configuration parameters from DHCP without
		   obtaining a lease on	an IP address. This is useful in situ-
		   ations  where  an IP	address	is obtained through mechanisms
		   other than DHCP.

	     ping  Check whether the interface given is	 under	DHCP  control,
		   which means that the	interface is managed by	the DHCP agent
		   and is working properly. An exit status of 0	means success.
		   This	 subcommand  has  no  meaning when the named interface
		   represents more than	one interface.

	     release
		   Relinquish the IPv4 address on the interface, and mark  the
		   interface as	"down."

	     start Start DHCP on the interface.

	     status
		   Display the DHCP configuration status of the	interface.

       auto-revarp
	     Use the Reverse Address Resolution	Protocol ("RARP") to automati-
	     cally acquire an address for this interface.

       broadcast address
	     For IPv4 only. Specify the	address	to use to represent broadcasts
	     to	the network. The default broadcast address is the address with
	     a host part of all	1's. A "+" (plus sign) given for the broadcast
	     value  causes  the	broadcast address to be	reset to a default ap-
	     propriate for the (possibly new) address and netmask.  The	 argu-
	     ments of ifconfig are interpreted left to right. Therefore

	     example% ifconfig -a netmask + broadcast +

	      and

	     example% ifconfig -a broadcast + netmask +

	     may  result  in different values being assigned for the broadcast
	     addresses of the interfaces.

       deprecated
	     Marks the address as a deprecated address.	 Addresses  marked  as
	     deprecated	 will not be used as source address for	outbound pack-
	     ets unless	either there are no other addresses available on  this
	     interface	or  the	 application has bound to this address explic-
	     itly. The status display shows DEPRECATED as part of flags.

       -deprecated
	     Marks the address as not deprecated.

       destination dest_address
	     Set the destination address for a point-to	point interface.

       dhcp  This option is an alias for option	auto-dhcp

       down  Mark an interface "down". When an interface is marked "down", the
	     system  does not attempt to transmit messages through that	inter-
	     face. If possible,	the interface is reset to disable reception as
	     well. This	action does not	automatically disable routes using the
	     interface.

       encr_auth_algs authentication algorithm
	     For a tunnel, enable IPsec	ESP with the authentication  algorithm
	     specified.	 It  can  be either a number or	an algorithm name, in-
	     cluding any or none, to indicate no algorithm preference.	If  an
	     ESP  encryption algorithm is specified but	the authentication al-
	     gorithm is	not, the default value for the ESP authentication  al-
	     gorithm will be any.

       encr_algs encryption algorithm
	     For  a  tunnel,  enable  IPsec  ESP with the encryption algorithm
	     specified.	It can be either a number or an	algorithm  name.  Note
	     that  all	IPsec  tunnel properties must be specified on the same
	     command line. To disable tunnel security, specify	the  value  of
	     encr_alg  as  none.  If an	ESP authentication algorithm is	speci-
	     fied, but the encryption algorithm	is not,	the default value  for
	     the ESP encryption	will be	null.

       -failover
	     Mark  the address as a non-failover address.Addresses marked this
	     way will not failover when	the interface  fails.  Status  display
	     shows "NOFAILOVER"	as part	of flags.

       failover
	     Mark  the	address	 as  a	failover  address.  This  address will
	     failover when the interface fails.	Status display does  not  show
	     "NOFAILOVER" as part of flags.

       group [ name |""]
	     Insert the	interface in the multipathing group specified by name.
	     To	delete an interface from a group, use a	null string "".
	      When invoked on the logical interface with id zero,  the	status
	     display shows the group name.

       index n
	     Change the	interface index	for the	interface. The value of	n must
	     be	an interface index (if_index) that is not used on another  in-
	     terface.  if_index	  will	be  a  non-zero	 positive  number that
	     uniquely identifies the network interface on the system.

       metric n
	     Set the routing metric of the interface to	 n;  if	 no  value  is
	     specified,	 the  default is  0. The routing metric	is used	by the
	     routing protocol. Higher metrics have  the	 effect	 of  making  a
	     route less	favorable; metrics are counted as addition hops	to the
	     destination network or host.

       modinsert mod_name@pos
	     Insert a module with name mod_name	to the stream of the device at
	     position pos. The position	is relative to the stream head.
	      Position 0 means directly	under stream head.

	     Based  upon  the example in the modlist option, use the following
	     command to	insert a module	with name ipqos	under  the  ip	module
	     and above the firewall module:

	     example% ifconfig hme0 modinsert ipqos@2

	     A	subsequent listing of all the modules in the stream of the de-
	     vice follows:

       example%	ifconfig hme0 modlist
       0 arp
       1 ip
       2 ipqos
       3 firewall
       4 hme

       modlist
	     List all the modules in the stream	of the device.

	     The following example lists all the modules in the	stream of  the
	     device:

       example%	ifconfig hme0 modlist
       0 arp
       1 ip
       2 firewall
       4 hme

       modremove mod_name@pos
	     Remove  a module with name	mod_name from the stream of the	device
	     at	position pos. The position is relative to the stream head.

	     Based upon	the example in the modinsert option, use the following
	     command  to  remove the firewall module from the stream after in-
	     serting the ipqos module:

	     example% ifconfig hme0 modremove firewall@3

	     A subsequent listing of all the modules in	the stream of the  de-
	     vice follows:

	     example% ifconfig hme0 modlist
	     0 arp
	     1 ip
	     2 ipqos
	     3 hme

	     Note that the core	IP stack modules, for example, ip and tun mod-
	     ules, cannot be removed.

       mtu  n
	     Set the maximum transmission unit of the interface	to n. For many
	     types of networks,	the mtu	has an upper limit, for	example,  1500
	     for Ethernet.

       netmask	mask
	     For IPv4 only. Specify how	much of	the  address  to  reserve  for
	     subdividing networks into subnetworks. The	mask includes the net-
	     work part of the local address and	 the  subnet  part,  which  is
	     taken  from  the host field of the	address. The mask contains 1's
	     for the bit positions in the 32-bit address which are to be  used
	     for  the network and subnet parts,	and 0's	for the	host part. The
	     mask should contain at least the standard	network	 portion,  and
	     the  subnet  field	should be contiguous with the network portion.
	     The mask can be specified in one of four ways:

	     1.	with a single hexadecimal  number with a leading 0x,

	     2.	with a dot-notation address,

	     3.	with a "+" (plus sign) address,	or

	     4.	with a pseudo host name/pseudo	network	name found in the net-
		work database  networks(4).

       If  a  "+"  (plus  sign)	 is  given for the netmask value,  the mask is
       looked up in the	 netmasks(4) database. This lookup finds  the  longest
       matching	 netmask in the	database by starting with the interface's IPv4
       address as the key and iteratively masking off more and more low	 order
       bits of the address. This iterative lookup ensures that the netmasks(4)
       database	can be used to specify the netmasks when variable length  sub-
       netmasks	are used within	a network number.

       If  a  pseudo  host name/pseudo network name is supplied	as the netmask
       value, netmask data may be located in the hosts or  networks  database.
       Names  are  looked  up by first using gethostbyname(3NSL). If not found
       there, the names	are looked up in getnetbyname(3SOCKET).	 These	inter-
       faces  may in turn use nsswitch.conf(4) to determine what data store(s)
       to use to fetch the actual value.

	     For both inet and inet6, the same information  conveyed  by  mask
	     can  be  specified	as a prefix_length attached to the address pa-
	     rameter.

       nud   Enables the neighbor  unreachability  detection  mechanism	 on  a
	     point-to-go interface.

       -nud  Disables  the  neighbor  unreachability  detection	mechanism on a
	     point-to-go interface.

       plumb Open the device associated	with the physical interface  name  and
	     set  up  the  streams needed for  IP to use the device. When used
	     with a logical interface name, this command is used to  create  a
	     specific named logical interface. An interface must be separately
	     plumbed for use by	IPv4 and IPv6.	The  address_family  parameter
	     controls whether the ifconfig command applies to IPv4 or IPv6.

	      Before  an  interface has	been plumbed, ,	the interface will not
	     show up in	the output of the ifconfig -a command.

       private
	     Tells the in.routed routing daemon	that the interface should  not
	     be	advertised.

       -private
	     Specify unadvertised interfaces.

       removeif	address
	     Remove the	logical	interface on the  physical interface specified
	     that matches the address specified.

       set   Set the  address,	prefix_length or both,	for an interface.

       standby
	     Marks the physical	interface as a standby interface.  If the  in-
	     terface  is marked	STANDBY	and is part of the multipathing	group,
	     the interface will	not be selected	to  send  out  packets	unless
	     some  other interface in the group	has failed and the network ac-
	     cess has been failed over to this standby interface.

	     The status	display	 shows	"STANDBY,  INACTIVE"  indicating  that
	     that  the interface is a standby and is also inactive.  IFF_INAC-
	     TIVE will be cleared when some other interface belonging  to  the
	     same  multipathing	 group	fails  over  to	this interface.	Once a
	     failback happens, the status display will return to INACTIVE.

       -standby
	     Turns off standby on this interface.

       subnet
	     Set the subnet address for	an interface.

       tdst tunnel_dest_address
	     Set the destination address of a tunnel. The address  should  not
	     be	the same as the	dest_address of	the tunnel, because no packets
	     leave the system over such	a tunnel.

       token address/prefix_length
	     Set the IPv6 token	of an interface	to be used for	address	 auto-
	     configuration.

	     example% ifconfig hme0 inet6 token	::1/64

       trailers
	     This  flag	 previously caused a nonstandard encapsulation of inet
	     packets on	certain	link levels. Drivers supplied  with  this  re-
	     lease  no longer use this flag. It	is provided for	compatibility,
	     but is ignored.

       -trailers
	     Disable the use of	a "trailer" link level encapsulation.

       tsrc tunnel_src_address
	     Set the source address of a tunnel. This is the source address on
	     an	 outer	encapsulating  IP header. It must be an	address	of an-
	     other interface already configured	using ifconfig.

       unplumb
	     Close the device associated with this physical interface name and
	     any  streams  that	ifconfig set up	for IP to use the device. When
	     used with a logical interface name, the logical interface is  re-
	     moved from	the system. After this command is executed, the	device
	     name will no longer appear	in the output of ifconfig -a.

       up    Mark an interface "up". This happens automatically	 when  setting
	     the  first	 address on an interface. The up option	enables	an in-
	     terface after an ifconfig down, which reinitializes the hardware.

       xmit  Enable an interface to transmit packets. This is the default  be-
	     havior when the interface is up.

       -xmit Disable  transmission  of	packets	on an interface. The interface
	     will continue to receive packets.

OPERANDS
       The interface operand, as well as address parameters  that  affect  it,
       are described below.

	      interface
		    A string of	the form, name physical-unit, for example, le0
		    or	ie1; or	of the form  name  physical-unit:logical-unit,
		    for	example, le0:1;	or of the form ip.tunN,	for tunnels.

		    If the interface name starts with a	dash (-), it is	inter-
		    preted as a	set of options which specify a set  of	inter-
		    faces.  In such a case, -a must be part of the options and
		    any	of the additional options below	can be	added  in  any
		    order.  If one of these interface names is given, the com-
		    mands following it are applied to all  of  the  interfaces
		    that match.

		    -a	  Apply	the commands to	all interfaces in the system.

		    -d	  Apply	 the  commands to all "down" interfaces	in the
			  system.

		    -D	  Apply	the commands to	 all   interfaces   not	 under
			  DHCP (Dynamic	Host Configuration Protocol) control.

		    -u	  Apply	 the  commands	to  all	"up" interfaces	in the
			  system.

		    -4	  Apply	the commands to	all IPv4 interfaces.

		    -6	  Apply	the commands to	all IPv6 interfaces.

	      address_family
		    The	address	family is specified by the address_family  pa-
		    rameter.  The ifconfig command currently supports the fol-
		    lowing families: ether, inet, and  inet6.  If  no  address
		    family is specified, the default is	inet.

	      address
		    For	 the  IPv4 family (inet), the address is either	a host
		    name present in the	host name data base (see hosts(4))  or
		    in	the Network Information	Service	(NIS) map hosts, or an
		    IPv4 address expressed in the Internet standard "dot nota-
		    tion".

		    For	 the IPv6 family (inet6), the address is either	a host
		    name present in the	host name data base  (see  ipnodes(4))
		    or in the Network Information Service (NIS)	map ipnode, or
		    an IPv6 address expressed in the Internet standard	colon-
		    separated	  hexadecimal	  format     represented    as
		    x:x:x:x:x:x:x:x where x is a hexadecimal number between  0
		    and	FFFF.

		    For	 the  ether address family, the	address	is an Ethernet
		    address represented	as x:x:x: x:x:x	where x	is a hexadeci-
		    mal	number between	0 and FF.

		    Some, though not all, of the Ethernet interface cards have
		    their own addresses. To use	cards that do not  have	 their
		    own	addresses, refer to section 3.2.3(4) of	the IEEE 802.3
		    specification for a	definition of the locally administered
		    address  space.  The use of	interface groups should	be re-
		    stricted to	those cards with their own addresses (see  IN-
		    TERFACE GROUPS).

	      prefix_length
		    For	 the IPv4 and IPv6 families (inet and inet6), the pre-
		    fix_length is a number between 0 and the number of bits in
		    the	 address.  For inet, the number	of bits	in the address
		    is 32; for inet6, the number of bits  in  the  address  is
		    128.  The  prefix_length denotes the number	of leading set
		    bits in the	netmask.

	      dest_address
		    If the dest_address	parameter is supplied in  addition  to
		    the	 address  parameter,  it  specifies the	address	of the
		    correspondent on the other end of a	point-to-point link.

	      tunnel_dest_address
		    An address that is or will be reachable through an	inter-
		    face  other	 than  the tunnel being	configured. This tells
		    the	tunnel where to	send the tunneled  packets.  This  ad-
		    dress  must	not be the same	as the tunnel_dest_address be-
		    ing	configured.

	      tunnel_src_address
		    As address that is attached	to an already  configured  in-
		    terface that has been configured "up" with ifconfig.

LOGICAL	INTERFACES
       Solaris TCP/IP allows multiple logical interfaces to be associated with
       a physical network interface. This allows a single machine  to  be  as-
       signed  multiple	IP addresses, even though it may have only one network
       interface. Physical network interfaces have names of the	 form  driver-
       name  physical-unit-number,  while logical interfaces have names	of the
       form driver-name	physical-unit-number:logical-unit-number.  A  physical
       interface  is  configured  into the system using	the plumb command. For
       example:

       example%	ifconfig le0 plumb

       Once a physical interface has been "plumbed", logical interfaces	 asso-
       ciated  with the	physical interface can be configured by	separate plumb
       or addif	 options to the	ifconfig command.

       example%	ifconfig le0:1 plumb

       allocates a specific logical interface associated with the physical in-
       terface le0. The	command

       example%	ifconfig le0 addif 192.9.200.1/24 up

       allocates  the  next  available logical unit number on the le0 physical
       interface and assigns an	address	and prefix_length.

       A logical interface can be configured with  parameters  (  address,pre-
       fix_length, and so on) different	from the physical interface with which
       it is associated. Logical interfaces that are associated	with the  same
       physical	interface can be given different parameters as well. Each log-
       ical interface must be associated with an existing  and	"up"  physical
       interface.  So,	for  example, the logical interface  le0:1 can only be
       configured after	the physical interface	le0 has	been plumbed.

       To delete a logical interface, use the unplumb or removeif options. For
       example,

       example%	ifconfig le0:1 down unplumb

       will delete the logical interface  le0:1.

INTERFACE GROUPS
       If  a  physical	interface  shares an IP	prefix with another interface,
       these interfaces	are collected into an interface	group. IP uses an  in-
       terface	group  to  rotate source address selection when	the source ad-
       dress is	unspecified, and in the	case of	multiple  physical  interfaces
       in  the same group, to scatter traffic across different IP addresses on
       a per-IP-destination basis. See netstat(1M) for per-IP-destination  in-
       formation.

       This feature may	be enabled by using ndd(1M).

       One  can	 also use the group keyword to form a multipathing group. When
       multipathing groups are used, the functionality of the interface	 group
       is  subsumed into the functionality of the multipathing group. A	multi-
       pathing group provides failure detection	and repair detection  for  the
       interfaces  in  the  group. See in.mpathd(1M) and System	Administration
       Guide, Volume 3.

       The interface groups formed using ndd(1M) will be made obsolete in  the
       future.	Accordingly,  it  is advisable to use form multipathing	groups
       using the group keyword.

CONFIGURING IPv6 INTERFACES
       When an IPv6 physical interface is plumbed and configured "up" with if-
       config,	it  is	automatically  assigned	an IPv6	link-local address for
       which the last 64 bits are calculated from the MAC address of  the  in-
       terface.

       ifconfig	le0 inet6 plumb	up

       The following example shows that	the link-local address has a prefix of
       fe80::/10.

       example%	ifconfig le0 inet6
       le0: flags=2000841<UP,RUNNING,MULTICAST,IPv6>
		  mtu 1500 index 2
	       inet6 fe80::a00:20ff:fe8e:f3ad/10

       If an advertising IPv6 router exists on the link	advertising  prefixes,
       then the	newly plumbed IPv6 interface will autoconfigure	logical	inter-
       face(s) depending on the	prefix advertisements. For example, for	prefix
       advertisements  fec0:0:0:55::/64	 and 3ff0:0:0:55::/64, the autoconfig-
       ured interfaces will look like:

       le0:1: flags=2080841<UP,RUNNING,MULTICAST,ADDRCONF,IPv6>
		 mtu 1500 index	2
	       inet6 fec0::55:a00:20ff:fe8e:f3ad/64
       le0:2: flags=2080841<UP,RUNNING,MULTICAST,ADDRCONF,IPv6>
		 mtu 1500 index	2
	       inet6 3ff0::55:a00:20ff:fe8e:f3ad/64

       Even if there are no prefix advertisements on the link, you  can	 still
       assign site-local and global addresses manually,	for example:

       example%	ifconfig le0 inet6 addif fec0::55:a00:20ff:fe8e:f3ad/64	up
       example%	ifconfig le0 inet6 addif 3ff0::55:a00:20ff:fe8e:f3ad/64	up

       To  configure  boot-time	defaults for the interface le0,	place the fol-
       lowing entries in the /etc/hostname6.le0	file:

       addif  fec0::55:a00:20ff:fe8e:f3ad/64 up
       addif  3ff0::55:a00:20ff:fe8e:f3ad/64 up

       Link-local addresses are	only used for on-link  communication  and  are
       not visible to other subnets.

   Configuring IPv6/IPv4 tunnels
       An  IPv6	 over  IPv4 tunnel interface can send and receive IPv6 packets
       encapsulated in an IPv4 packet. Create tunnels  at both	ends  pointing
       to  each	 other.	 IPv6  over IPv4 tunnels require the tunnel source and
       tunnel destination IPv4 and IPv6	addresses. Solaris 8 supports both au-
       tomatic and configured tunnels. For automatic tunnels, an IPv4-compati-
       ble IPv6	address	is used. The following demonstrates  auto-tunnel  con-
       figuration:

       example%	ifconfig ip.atun0 inet6	plumb
       example%	ifconfig ip.atun0 inet6	tsrc <IPv4-address> \
	  ::<IPv4 address>/96 up

       where  IPv4-address  is the IPv4	address	of the interface through which
       the tunnel traffic will flow, and  IPv4-address,	 ::<IPv4-address>,  is
       the corresponding IPv4-compatible IPv6 address.

       The following is	an example of a	configured tunnel:

       example%	ifconfig ip.tun0 inet6 plumb tsrc <my-ipv4-address> \
	  tdst <peer-ipv4-address> up

       This  creates  a	 configured  tunnel  between my-ipv4-address and peer-
       ipv4-address with corresponding link-local addresses. For tunnels  with
       global  or  site-local addresses, the logical tunnel interfaces need to
       be configured in	the following form:

       ifconfig	ip.tun0	inet6 addif <my-v6-address> <peer-v6-address> up

       For example,

       example%	ifconfig ip.tun0 inet6 plumb tsrc 109.146.85.57	\
	  tdst 109.146.85.212 up
       example%	ifconfig ip.tun0 inet6 addif 2::45 2::46 up

       To show all IPv6	interfaces that	are up and configured:

       example%	ifconfig -au6
       ip.tun0:	flags=2200851<UP,POINTOPOINT,RUNNING,MULTICAST,NONUD,IPv6>
		 mtu 1480 index	3
	       inet tunnel src 109.146.85.57   tunnel dst 109.146.85.212
	       inet6 fe80::6d92:5539/10	--> fe80::6d92:55d4
       ip.tun0:1: flags=2200851<UP,POINTOPOINT,RUNNING,MULTICAST,NONUD,IPv6>
		 mtu 1480 index	3
	       inet6 2::45/128 --> 2::46

EXAMPLES
       Example 1: Using	the ifconfig Command

       If your workstation is not attached to an Ethernet, the	le0  interface
       should be marked	"down" as follows:

       example%	ifconfig le0 down

       Example 2: Printing Addressing Information

       To  print  out  the  addressing information for each interface, use the
       following command:

       example%	ifconfig -a

       Example 3: Resetting the	Broadcast Address

       To reset	each interface's broadcast address  after  the	netmasks  have
       been correctly set, use the next	command:

       example%	ifconfig -a broadcast +

       Example 4: Changing the Ethernet	Address

       To  change  the	Ethernet address for interface	le0, use the following
       command:

       example%	ifconfig le0 ether aa:1:2:3:4:5

       Example 5: Configuring an IP-in-IP Tunnel

       To configure an IP-in-IP	tunnel,	first plumb it with the	following com-
       mand:

       example%	ifconfig ip.tun0 plumb

	Then  configure	it as a	point-to-point interface, supplying the	tunnel
       source and the tunnel destination:

       example%	ifconfig ip.tun0 myaddr	mydestaddr tsrc	another_myaddr \
		  tdst a_dest_addr up

       Tunnel security properties must be configured on	one invocation of  if-
       config:

       example%	ifconfig ip.tun0 encr_auth_algs	md5 encr_algs 3des

       Example 6: Requesting a Service Without Algorithm Preference

       To request a service without any	algorithm preferences, specify any:

       example%	ifconfig ip.tun0 encr_auth_algs	any encr_algs any

       Example 7: Disabling All	Security

       To  disable all security, specify any security service with none	as the
       algorithm value:

       example%	ifconfig ip.tun0 auth_algs none

       or

       example%	ifconfig ip.tun0 encr_algs none

FILES
       /etc/netmasks
	     netmask data

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       /usr/sbin

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE	TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability for	op-  |Evolving			   |
       |tions  modlist,	 modinsert,  |				   |
       |and modremove		     |				   |
       +-----------------------------+-----------------------------+

       /sbin

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE	TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsr			   |
       +-----------------------------+-----------------------------+
       |Interface Stability for	op-  |Evolving			   |
       |tions  modlist,	 modinsert,  |				   |
       |and modremove		     |				   |
       +-----------------------------+-----------------------------+

SEE ALSO
       dhcpinfo(1), dhcpagent(1M), in.mpathd(1M), in.routed(1M), ndd(1M), net-
       stat(1M),  ethers(3SOCKET), gethostbyname(3NSL),	getnetbyname(3SOCKET),
       hosts(4), netmasks(4),  networks(4),  nsswitch.conf(4),	attributes(5),
       arp(7P),ipsecah(7P),ipsecesp(7P),tun(7M)

       System Administration Guide, Volume 3

DIAGNOSTICS
       ifconfig	sends messages that indicate if:

	  o  the specified interface does not exist

	  o  the requested address is unknown

	  o  the user is not privileged	and tried to alter an interface's con-
	     figuration

NOTES
       It is recommended that the names	broadcast,  down,  private,  trailers,
       up,  and	 the other possible option names not be	selected when choosing
       host names. Choosing any	one of these names as host  names  will	 cause
       bizarre problems	that can be extremely difficult	to diagnose.

SunOS 5.9			  19 Dec 2001			  ifconfig(1M)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | LOGICAL INTERFACES | INTERFACE GROUPS | CONFIGURING IPv6 INTERFACES | EXAMPLES | FILES | ATTRIBUTES | SEE ALSO | DIAGNOSTICS | NOTES

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