abort Closes all TCP connections associated with a network address. Use this parameter when removing aliases or deleting network addresses. This prevents connections from hanging when the network address is deleted. alias alias_address[/bitmask] Establishes an additional network address for this interface. This can be useful when changing network numbers and you want to continue to accept packets addressed to the old interface. If you do not specify a bitmask or netmask with the alias address, the default netmask is based on the alias address's network class. If you are using the optional bitmask argument, do not use the netmask argument. This parameter has the following restrictions: o You can specify only one alias alias_address parameter for each ifconfig command line. o You cannot specify an alias and a primary address on the same command line. -alias alias_address Removes the network address specified. This can be used either if you incorrectly specified an alias or if an alias is no longer needed. The -alias parameter functions in the same manner as the delete parameter. aliaslist address_list[/bitmask] Establishes a range of additional network addresses for this interface. The range can be a comma-separated list or a hyphenated list, and is inclusive. You can also specify the optional CIDR bitmask (/bitmask) argument at the end of the list. Do not use a comma-separated list and a hyphenated list for a range. (IPv4 only) -aliaslist Removes a range of network addresses for this interface. This can be useful when deleting network numbers and you want to keep the primary interface address. The alias list rules are the same as for the aliaslist parameter. (IPv4 only) allmulti Enables the reception of all multicast packets. -allmulti Disables the reception of all multicast packets. arp Enables the use of the Address Resolution Protocol (ARP) in mapping between network-level addresses and link-level addresses. This parameter is on by default. -arp Disables the use of the ARP. Use of this parameter is not recommended. broadcast broad_address Specifies the address to use to represent broadcasts to the network. The default broadcast address is the address with a host part consisting of all 1s (ones). Note that the computation of the host part is dependent on netmask. (See the description of the netmask parameter for more information). delete [net_address] Removes the network address specified. Use this parameter if you incorrectly specified an alias, or if it was no longer needed. If you incorrectly set an NS address, specifying the host portion, remove all NS addresses to respecify the host portion. If no address is specified, all network addresses for the interface are deleted. Be careful when you use this parameter. If you either specify the network address before the delete parameter or specify no network address after the delete parameter, all IPv4 and IPv6 network addresses for the interface and IPv6 routes are deleted. IPv4 routes are not deleted. down Marks an interface as not working (down), which keeps the system from trying to transmit messages through that interface. If possible, the ifconfig command also resets the interface to disable reception of messages. Routes that use the interface, however, are not automatically disabled. ip6dadtries value Specifies the number of consecutive Neighbor Solicitation messages that your system transmits while it performs Duplicate Address Detection on a tentative address. (IPv6 only) ip6hoplimit hops Sets the default number of hops to be included in transmitted unicast IP packets. (IPv6 only) ip6interfaceid id Overrides that default interface ID, which depends on the underlying link type (for example, Ethernet, FDDI, and Token Ring), and specifies id as the interface ID. For example, if your system has the Ethernet hardware address 08-00-2b-2a-1e-d3, the following command generates the inet6 link-local address fe80::a00:2bff:fe2a:1ed3 for the interface: ifconfig ln0 ipv6 On the same system, the following command generates the IPv6 interface ID abcd:1234 for the interface: ifconfig ln0 ip6interfaceid ::abcd:1234 ipv6 (IPv6 only) ip6mtu mtu_value Alters the maximum transfer unit (MTU) for messages that your system transmits on the link. (IPv6 only) ip6nonud Disables Neighbor Unreachability Detection (NUD) on the interface. (IPv6 only) ip6reachabletime time Sets the time, in milliseconds, that your system con siders a neighbor is reachable after your system receives a reachability confirmation message. (IPv6 only) ip6retranstimer value Sets the time interval, in milliseconds, between Neighbor Solicitation messages to a neighbor. (IPv6 only) ipmtu mtu_value Alters the size of the maximum transfer unit (MTU) for messages that your system transmits. It might be necessary to reduce the MTU size so that bridges connecting token rings can transfer frames without error. ipv6 Initializes IPv6-related data structures and assigns an IPv6 link-local address to the interface. (IPv6 only) -ipv6 Removes any IPv6 configuration associated with the interface, including all IPv6 addresses and IPv6 routes through the interface. This is equivalent to the following command: ifconfig interface inet6d delete (IPv6 only) metric number Sets the routing metric, or number of hops, for the interface to the value of number. The default value is 0 (zero) if number is not specified, indicating that both hosts are on the same network. The routing metric is used by ROUTED and GATED, with higher metrics indicating that the route is less favorable. ndna [ address ] Sends an unsolicited ICMPv6, Neighbor Advertisement for each address configured on the interface. If the address is provided, then send a Neighbor Advertisment for the specified address only. If a DNS alias is used as the address, a Neighbor Advertisement is sent for each address that comprises the DNS alias name. (IPv6 only) netmask mask Specifies how much of the address to reserve for subdividing networks into sub-networks. This parameter can only be used with an address family of inet. Do not use this parameter if you are specifying the CIDR mask (/bitmask) with the address argument, alias parameter, or aliaslist parameter. The mask variable includes both 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 beginning with 0x, in the standard Internet dotted-decimal notation, or beginning with a name. The mask contains 1s (ones) for the bit positions in the 32-bit address that are reserved for the network and subnet parts, and 0s (zeros) for the bit positions that specify the host. The mask should contain at least the standard network portion. The default netmask is based on the address parameter's network class. (IPv4 only) up Marks an interface as working (up). This parameter is used automatically when setting the first address for an interface, or can be used to enable an interface after an ifconfig down command. If the interface was reset when previously marked with the parameter down (see the following section for a description of this parameter), the hardware will be reinitialized.