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1.1 root 1: .TH IFCONFIG 8C "28 August 1983"
2: .UC 4
3: .SH NAME
4: ifconfig \- configure network interface parameters
5: .SH SYOPNSIS
6: .B /etc/ifconfig
7: interface
8: [
9: .I address
10: ] [
11: .I parameters
12: ]
13: .SH DESCRIPTION
14: .I Ifconfig
15: is used to assign an address
16: to a network interface and/or configure
17: network interface parameters.
18: .I Ifconfig
19: must be used at boot time to define the network address
20: of each interface present on a machine; it may also be used at
21: a later time to redefine an interface's address.
22: For the Ethernet network, the network interface must be assigned with both
23: Internet and Ethernet station addresses using this command.
24: .PP
25: The
26: .I interface
27: parameter is a string of the form 'name unit', e.g. 'en0'.
28: .PP
29: The
30: .I address
31: parameter could be one of the following types:
32: .IP -
33: a host name in the file
34: .I /etc/hosts,
35: or
36: .IP -
37: a network name in the file
38: .I /etc/networks,
39: or
40: .IP -
41: a DARPA Internet address expressed in the Internet standard
42: "dot notation", or
43: .IP -
44: an Ethernet station address whose format is
45: Ex.x.x.x.x.x where x is a
46: .I hexadecimal
47: number.
48: .PP
49: .I Ifconfig
50: determines the address type by the sequence of the above list.
51: The address names can not be any of the parameters described below.
52: .PP
53: The following parameters may be set with
54: .IR ifconfig :
55: .TP 15
56: .B up
57: Mark an interface ``up''.
58: .TP 15
59: .B down
60: Mark an interface ``down''. When an interface is
61: marked ``down'', the system will not attempt to
62: transmit messages through that interface.
63: .TP 15
64: .B trailers
65: Enable the use of a ``trailer'' link level encapsulation when
66: sending (default).
67: If a network interface supports
68: .IR trailers ,
69: the system will, when possible, encapsulate outgoing
70: messages in a manner which minimizes the number of
71: memory to memory copy operations performed by the receiver.
72: .TP 15
73: .B \-trailers
74: Disable the use of a ``trailer'' link level encapsulation.
75: .TP 15
76: .B arp
77: Enable the use of the Address Resolution Protocol in mapping
78: between network level addresses and link level addresses (default).
79: This is currently implemented for mapping between DARPA Internet
80: addreses and 10Mb/s Ethernet addresses.
81: .TP 15
82: .B \-arp
83: Disable the use of the Address Resolution Protocol.
84: .PP
85: .I Ifconfig
86: displays the current configuration for a network interface
87: when no optional parameters are supplied.
88: .PP
89: Only the super-user may modify the configuration of a network interface.
90: .SH DIAGNOSTICS
91: Messages indicating the specified interface does not exit; the
92: requested address is unknown; the Ethernet station address format is invalid;
93: the user is not privileged and tried to alter an interface's configuration.
94: .SH "SEE ALSO"
95: rc(8), intro(4N), netstat(1), nstat(8)
96: .SH "BUGS"
97: .I
98: ifconfig
99: does not display the station address of an Ethernet interface. The user
100: must use
101: .I nstat
102: to get the station address.
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