139 lines
4.0 KiB
Groff
139 lines
4.0 KiB
Groff
.\" Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the project nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: gifconfig.8,v 1.2 1999/07/01 19:42:12 itojun Exp $
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.\"
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.Dd May 17, 1998
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.Dt GIFCONFIG 8
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.Os
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.\"
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.Sh NAME
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.Nm gifconfig
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.Nd configure generic IP tunnel
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.\"
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.Sh SYNOPSIS
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.Nm
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.Ar interface
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.Op Ar af
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.Op Ar physsrc physdest
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.Nm gifconfig
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.Fl a
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.\"
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.Sh DESCRIPTION
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.Nm
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configures the physical address for the generic IP tunnel
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inteface, such as "gif0".
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Argument
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.Ar physsrc
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and
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.Ar physdest
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are interpreted as the outer source/destination address for
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encapsulating IPv4/v6 header.
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Argument
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.Ar af
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specifies the address family for
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.Ar physsrc
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and
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.Ar physdest .
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.Ar Af
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can be
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.Li inet
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or
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.Li inet6 ,
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and will be treated as
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.Li inet
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if ommitted.
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.Pp
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.Nm
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takes the following optional argument:
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.Bl -tag -width Ds
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.It Fl a
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Display information associated all generic IP tunnel interfaces.
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.El
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.Pp
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Please note that it is very easy to create infinite routing loop,
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when you configure tunnel over same address family
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.Po
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e.g. IPv4-over-IPv4
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.Pc .
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.\"
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.Sh EXAMPLES
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If you would like to configure IPv6 over IPv4(aka IPv6 in IPv4)
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tunnel between
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.Li 10.1.1.1
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and
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.Li 10.2.3.4 ,
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you should perform the following command:
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.Bd -literal -offset
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# gifconfig gif0 inet 10.1.1.1 10.2.3.4
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.Ed
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.Pp
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To use the
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.Li 0.0.0.0
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feature to establish a tunnel from host1 to host3
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which will encapsulate and carry packets from host2, on host1 do:
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.Bd -literal -offset
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# ifconfig gif0 inet host1 127.0.0.2 # assign an address to gif0
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# gifconfig gif0 inet host1 0.0.0.0 # assign encapsulation addresses
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# route add host2 host3 -ifp gif0: # encap host2 packets, send to host3
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.Ed
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.Pp
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Note: the
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.Fl ifp
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option to route does not work as documented in
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most versions of FreeBSD.
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.Pp
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On host3 do:
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.Bd -literal -offset
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# ifconfig gif0 inet host3 127.0.0.2 # assign an address to gif0
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# gifconfig gif0 inet host3 0.0.0.0 # assign encapsulation addresses
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.Ed
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.Pp
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Now if you ping host2 from host1, the packets should be encapsulated
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with outer source address = host1 and outer destination address = host3,
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and delivered to host3.
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host3 will decapsulate the packet and deliver it normally to host2.
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.Pp
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This is also possible with IPv6 outer proto, by replacing
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.Li inet
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to
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.Li inet6 ,
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and IPv4 addresses to some appropriate IPv6 addresses in above example.
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.\"
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.Sh RETURN VALUES
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The command exits with exit status of 1 on errors, 0 on success.
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.\"
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.Sh SEE ALSO
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.Xr gif 4 ,
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.Xr ifconfig 8
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.Sh HISTORY
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The
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.Nm
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command first appeared in WIDE Hydrangea IPv6 protocol stack kit.
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.\" .Sh BUGS
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.\" (to be written)
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