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mint/sys/share/man/man8/ifconfig
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mint/sys/share/man/man8/ifconfig
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.TH ifconfig 8 MintNet
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.SH NAME
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ifconfig \- network interface configuration
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.SH SYNOPSIS
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.B "ifconfig [-a|-v] [-f <filename>] [interface options]"
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.SH DESCRIPTION
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.I Ifconfig
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is used to set and show the addresses, flags and options
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of network interfaces.
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.PP
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When
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.I ifconfig
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is invoked without arguments,
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it shows a table of all running network interfaces, their addresses
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and flags in a human readable form.
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The option
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.B "-a"
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forces
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.I ifconfig
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to display all interfaces in the system, no
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matter if they are running or not. The option
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.B "-f <filename>"
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passes driver specific options to
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.I ifconfig
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. You will find descriptions for these specific options in the
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README files of every driver that supports this.
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.PP
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When a single argument (the name of a network interface) is given,
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.I ifconfig
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just shows the status of this interface.
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.PP
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.I ifconfig
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sets flags and addresses of the interface named as the first
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argument when additional options are given.
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.SH OPTIONS
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.TP 15
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.SM interface
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The name of the interface to deal with.
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.BR lo0 ,
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and
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.B sl0
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are valid names for the loopback interface and the SLIP interface
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(channel 0) respectively.
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.TP
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.SM "addr \fBinetaddr\fP"
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This option causes
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.I ifconfig
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to set the local IP address of the interface to
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.BR inetaddr .
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This is the address your machine can be reached at over this interface.
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.B inetaddr
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can be in standard IP address dot notation or can be a symbolic name
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which is resolved into an IP address.
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NOTE that you must not use a symbolic name when setting up the loopback
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interface, because symbolic names cannot be resolved before the loopback
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interface is set up.
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.TP
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.SM "dstaddr \fBinetaddr\fP"
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Set the point to point destination address of the interface to
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.BR inetaddr ,
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which
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can be an IP address or a symbolic name.
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This option will only work on point to point interfaces, like the
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.B sl?
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ones.
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.TP
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.SM "broadaddr \fBaa.bb.cc.dd\fP"
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Set the broadcast address of the interface to
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.BR "aa.bb.cc.dd" .
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This defaults to the net broadcast address of the attached network, but
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can be set to any valid IP address.
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This option will only work on interfaces that support broadcasting, like
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the
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.B lo0
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interface.
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.TP
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.SM "netmask \fBaa.bb.cc.dd\fP"
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Set the subnet mask of the interface to
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.BR "aa.bb.cc.dd" .
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This is by default the class A, B or C netmask of the local address
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of the interface set with the
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.B "addr"
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option.
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It can be used to split a large network into many small subnetworks.
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.TP
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.SM up
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This sets the UP flag on the interface. This is used to activate the
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interface.
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.TP
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.SM down
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This clears the UP flags on the interface. This is used to shut down
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the interface.
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.TP
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.SM [-]arp
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(De)activate usage of the ARP (address resolution protocol) protocol
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for resolving IP addresses into hardware addresses.
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.TP
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.SM [-]trailers
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(De)activate usage of trailer encapsulation for this interface.
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.TP
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.SM [-]debug
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(De)activate debugging for this interface. Debugging is currently
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a no-op.
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.TP
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.SM mtu NN
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Set the mtu (maximum transmission unit) of the interface to NN bytes.
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Better make it large enough as long as fragmentation is not implemented.
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.TP
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.SM metric NN
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Set the metric of the interface to NN. This value is currently not used.
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.TP
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.SM [-]linkNN
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This option sets (clears) the bit with number NN in the link level flag
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word of the interface.
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The flag word is 16 bits wide, so [-]link0 through [-]link15 are valid.
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Bit 0 is the least significant, bit 15 the most significant bit.
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.br
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Link level flags are interface type specific. Thats why
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.I ifconfig
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only uses bit numbers instead of meaningful names for them.
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Currently only SLIP interfaces support link level flags.
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Bit 3 turns auto compression on: if set and a VJ compressed SLIP
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frame is received the interface enables compression for outgoing frames.
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Bit 4 is the compression bit: if set VJ header compression is enabled.
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.SH AUTHOR
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Kay Roemer <roemer@rbi.informatik.uni-frankfurt.de>
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Torsten Lang <Torsten@Lang.net>
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.SH SEE ALSO
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.IR route(8).
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