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| address | For the DARPA-Internet family, the address is either a host name present in the host name data base, or a DARPA Internet address expressed in the Internet standard ``dot notation''.
It is also possible to use the CIDR notation (also known as the slash notation) to include the netmask. That is, one can specify an address like 192.168.0.1/16. |
| addres_family | Specify the address family which affects interpretation of the remaining parameters. Since an interface can receive transmissions in differing protocols with different naming schemes, specifying the address family is recommended. The address or protocol families currently supported are ``inet'', ``inet6'', |
| dest_address | Specify the address of the correspondent on the other end of a point to point link. |
| interface | This parameter is a string of the form ``name unit'', for example, ``en0''. |
| add | Another name for the alias parameter. Introduced for compatibility with BSD/OS. |
| alias | Establish an additional network address for this interface. This is sometimes useful when changing network numbers, and one wishes to accept packets addressed to the old interface. If the address is on the same subnet as the first network address for this interface, a netmask of 0xffffffff has to be specified. |
| -alias | Remove the network address specified. This would be used if you incorrectly specified an alias, or it was no longer needed. If you have incorrectly set an NS address having the side effect of specifying the host portion, removing all NS addresses will allow you to respecify the host portion. |
| anycast | (Inet6 only.) Specify that the address configured is an anycast address. Based on the current specification, only routers may configure anycast addresses. Anycast address will not be used as source address of any of outgoing IPv6 packets. |
| arp | Enable the use of the Address Resolution Protocol in mapping between network level addresses and link level addresses (default). This is currently implemented for mapping between DARPA Internet addresses and IEEE 802 48-bit MAC addresses (Ethernet, FDDI, and Token Ring addresses). |
| -arp | Disable the use of the Address Resolution Protocol |
| broadcast | (Inet 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. |
| debug | Enable driver dependent debugging code; usually, this turns on extra console error logging. |
| -debug | Disable driver dependent debugging code. |
| delete | Another name for the -alias parameter. |
| down | Mark an interface ``down''. When an interface is marked ``down'', the system will not attempt to transmit messages through that interface. If possible, the interface will be reset to disable reception as well. This action does not automatically disable routes using the interface. |
| ether | Another name for the lladdr parameter. |
| lladdr addr | Set the link-level address on an interface. This can be used to e.g. set a new MAC address on an ethernet interface, though the mechanism used is not ethernet-specific. The address addr is specified as a series of colon-separated hex digits. If the interface is already up when this option is used, it will be briefly brought down and then brought backup again in order to ensure that the receive filter in the underlying ethernet hardware is properly reprogrammed. |
| media type | If the driver supports the media selection system, set the media type of the interface to type. Some interfaces support the mutually exclusive use of one of several different physical media connectors. For example, a 10Mb/s Ethernet interface might support the use of either AUI or twisted pair connectors. Setting the media type to ``10base5/AUI'' would change the currently active connector to the AUI port. Setting it to ``10baseT/UTP'' would activate twisted pair. Refer to the interfaces' driver specific documentation or man page for a complete list of the available types. |
| -mediaopt opts | If the driver supports the media selection system, set the specified media options on the interface. The opts argument is a comma delimited list of options to apply to the interface. Refer to the interfaces' driver specific man page for a complete list of available options. |
| tunnel src_addr dest_addr | (IP tunnel devices only.) Configure the physical source and destination address for IP tunnel interfaces. The arguments src_addr and dest_addr are interpreted as the outer source/destination for the encapsulating IPv4/IPv6 header. |
| deletetunnel | Unconfigure the physical source and destination address for IP tunnel interfaces previously configured with tunnel. |
| create | Create the specified network pseudo-device. If the interface is given without a unit number, try to create a new device with an arbitrary unit number. If creation of an arbitrary device is successful, the new device name is printed to standard output. |
| destroy | Destroy the specified network pseudo-device. |
| plumb | Another name for the create parameter. Included for Solaris compatibility. |
| unplumb | Another name for the destroy parameter. Included for Solaris compatibility. |
| metric n | Set the routing metric of the interface to n, default 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. |
| mtu n | Set the maximum transmission unit of the interface to n, default is interface specific. The MTU is used to limit the size of packets that are transmitted on an interface. Not all interfaces support setting the MTU, and some interfaces have range restrictions. |
| netmask mask | (Inet only.) Specify how much of the address to reserve for subdividing networks into subnetworks. The mask includes the network part of the local address and the subnet part, which is taken from the host field of the address. The mask can be specified as a single hexadecimal number with a leading `0x', with a dot-notation Internet address, or with a pseudo-network name listed in the network table. 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 netmask can also be specified in CIDR notation after the address. See the address option above for more information. |
| prefixlen len | (Inet6 only.) Specify that len bits are reserved for subdividing networks into sub-networks. The len must be integer, and for syntactical reason it must be between 0 to 128. It is almost always 64 under the current IPv6 assignment rule. If the parameter is omitted, 64 is used. |
| remove | Another name for the -alias parameter. Introduced for compatibility with BSD/OS. |
| link[0-2] | Enable special processing of the link level of the interface. These three options are interface specific in actual effect, how- ever, they are in general used to select special modes of operation. An example of this is to enable SLIP compression, or to select the connector type for some Ethernet cards. Refer to the man page for the specific driver for more information. |
| -link[0-2] | Disable special processing at the link level with the specified interface. |
| up | Mark an interface ``up''. This may be used to enable an interface after an ``ifconfig down''. It happens automatically when setting the first address on an interface. If the interface was reset when previously marked down, the hardware will be re-initialized. |
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