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> > ifconfig lan1 10.0.0.241 netmask 255.255.0.0 metric 1 mtu 1492 - пишет
> > 
> > Invalid argument. 
> 
>  
>  The IFCONFIG command assigns an address to a network interface and also configures network interface 
>  parameters.  You must use the IFCONFIG command to define the network address of each interface present on 
>  the machine.  You can also use the IFCONFIG command to redefine an interface address or other operating 
>  parameters. 
> 
>  
>  Warning:   Do not attempt to modify the configuration of a network interface unless you are an experienced 
>  TCP/IP user. 
> 
>  
>  The following example shows the format of the IFCONFIG command. 
>  
>  IFCONFIG interface [[af] [address [dest_address]] [up | down]
>                 [netmask mask]] [metric n] [mtu n]  [trailers | -trailers]
>                 [arp | -arp] [bridge | -bridge] [snap | -snap] [-allrs]
>                 [broadcast broadcast_address] [802.3 | -802.3]
>                 [icmpred | -icmpred] [canonical | -canonical]
>  
>  The parameters of the IFCONFIG command are: 
> 
>   Parameter           Description 
> 
>   interface           The name of the interface you are configuring (lan0, lan1, lan2, lan3, sl, x25, or lo). 
> 
>                       Note:     The lo parameter creates a software local loopback interface. The local loopback 
>                       interface bypasses the network interface drivers to provide a direct internal connection back 
>                       to the local internet protocol support.  For example, if you type ifconfig lo 2.2.2.2, you can 
>                       use the address 2.2.2.2 as a software loopback. 
> 
>   af                  Name of the address family supported. 
> 
>                       You must specify the address family (af), because an interface can receive transmissions in 
>                       different protocols, and each protocol requires a separate naming scheme.  However, 
>                       specifying the address family can change the interpretation of the remaining parameters.  
>                       Specify only inet, which is the default. 
> 
>   address             The address assigned to a particular interface in the standard dotted-decimal notation. 
> 
>   dest_address        Specifies the address of the correspondent on the receiving end of a point-to-point link. 
> 
>   up                  Enables an interface after the interface has been marked down with an IFCONFIG statement. 
> 
>                       Interfaces are automatically marked up when the first address is set on an interface. 
> 
>   down                Marks an interface down.  When an interface is marked down, the system does not attempt 
>                       to transmit messages through that interface.  In some cases, the reception of messages is also 
>                       disabled. 
> 
>                       This action does not automatically disable routes using the interface. 
> 
>   netmask mask        This parameter is used for networks only.  The mask value specifies how much of the 
>                       internet address to reserve for use as a subnetwork address. 
> 
>                       For example, the subnetwork capability of TCP/IP divides a single network into multiple 
>                       logical networks.  An organization can have a single internet network address that is known 
>                       to users outside the organization, yet configure its internal network into different 
>                       departmental subnets. 
> 
>                       The subnet, or local address, portion of an internet address is then divided into a subnet 
>                       number and a host number, for example: 
> 
>                       network_number subnet_number host_number 
> 
>                       where: 
> 
>                       network_number           is the network portion of the internet address. 
> 
>                       subnet_number            is the subnet number portion of the local address. 
> 
>                       host_number              is the host number portion of the local address. 
> 
>                       The mask value includes the network portion of the local address and the subnet portion, 
>                       which is taken from the host field of the address.  The mask can be specified as a single 
>                       hexadecimal number with a leading 0x, or with a dotted-decimal notation address. 
> 
>                       The mask contains 1s for the bit positions in the 32-bit address that are to be used for the 
>                       network and subnet parts and 0s for the host part.  The mask should contain at least the 
>                       standard network portion, but the bits of the netmask do not have to be contiguous.  The 
>                       subnet field should be contiguous with the network portion. 
> 
>                       For an example of the ROUTE command with the subnet parameter, see ROUTE - Modifying 
>                       Routing Tables. 
> 
>   metric n            Sets the metric for the interface to n.  The value n represents a number and should be 
>                       between 0 and 15.  The default is 0 (directly connected).  The routing metric is used by the 
>                       Routing Information Protocol (RIP). 
> 
>                       Metrics that are greater in value make a route less favorable.  Metrics are counted as the 
>                       number of hops to the destination network or host. 
> 
>   mtu n               Sets the maximum transmission unit (MTU) of the interface to n.  The value n represents a 
>                       number.  The default MTU value is 1500. 
> 
>                       Notes: 
> 
>                         1. When using a PCNet adapter, the MTU should be set to a maximum of 1462. 
> 
>                         2. When using an Ethernet adapter on an IEEE 802.3 network, the MTU should be set to a 
>                            maximum of 1492. 
> 
>                         3. When using an IBM Token Ring 16/4 Adapter/A card on a 16 megabyte token ring, the 
>                            MTU should be set to a maximum of 4400. 
> 
>                         4. When using an X.25 co-processor adapter, the MTU should be set to a maximum of 576. 
> 
>   trailers            Requests the use of a trailer link level encapsulation when sending. 
> 
>                       For example, if a network interface supports trailers, the system, when possible, encapsulates 
>                       outgoing messages, which minimizes the number of memory-to-memory copy operations that 
>                       the receiver must perform. 
> 
>                       On networks that support the Address Resolution Protocol (ARP), this parameter indicates 
>                       that the system should request that other systems use trailers when sending to this host.  
>                       Trailer encapsulations are sent to other hosts that have made such requests. 
> 
>   -trailers           Disables trailer link level encapsulation.  This is the default. 
> 
>   arp                 Enables ARP in mapping between network level addresses and physical, or station addresses. 
> 
>                       ARP is currently implemented for mapping between internet addresses and Ethernet addresses 
>                       or IBM Token-Ring addresses. 
> 
>   -arp                Disables Address Resolution Protocol. 
> 
>   bridge              Enables routing field support. 
> 
>   -bridge             Disables routing field support. 
> 
>   snap                Sends token-ring headers with the extended snap format.  This is the Institute of Electrical 
>                       and Electronic Engineers (IEEE) standard and is necessary to communicate with machines 
>                       using the extended snap format, such as AIX.  The snap parameter is the configuration 
>                       default. 
> 
>   -snap               Does not send token-ring headers with the extended snap format. 
> 
>   -allrs              Sets the token-ring broadcast indicator to Single-Route Broadcast.  The default is All-Routes 
>                       Broadcast.  See IBM OS/2 LAN Technical Reference for more information. 
> 
>   broadcast broadcast_address 
>                       Specifies the address to use to represent broadcasts to the network.  The default broadcast 
>                       address is an internet address with a local address that has a value of all 1s. 
> 
>   802.3               Enables Ethernet 802.3. 
> 
>   -802.3              Disables Ethernet 802.3.  Enables Ethernet DIX 2.  This is the default. 
> 
>   icmpred             Allows TCP/IP to add routes obtained by the ICMP redirects.  This is the default. 
> 
>   -icmpred            Prevents TCP/IP from adding routes obtained by ICMP redirects. 
> 
>   canonical           Media Access Control (MAC) addresses in Address Resolution Protocol (ARP) packets on this 
>                       Token-Ring network are in the canonical IEEE 802.5 form. 
> 
>   -canonical          MAC addresses in ARP packets on this Token-Ring network are in the more common 
>                       non-canonical format.  This is the default. 
>   
>   The IFCONFIG command displays the current configuration for a network interface when only an interface is 
>   supplied.  If a protocol family is specified using af, IFCONFIG reports only the details specific to that protocol 
>   family. 
> 
>   To receive help for the command syntax, use the IFCONFIG command alone, without specifying an interface, 
>   address, or parameter. 
> 
> 
>

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