2 .\" $KAME: gifconfig.8,v 1.5 2000/05/13 07:48:10 itojun Exp $
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36 .Nd configure generic IP tunnel
41 .Op Ar physsrc physdest
49 configures the physical address for the generic IP tunnel
50 inteface, such as "gif0".
55 are interpreted as the outer source/destination address for
56 encapsulating IPv4/v6 header.
59 specifies the address family for
68 and will be treated as
76 just deletes the existing source and destination addresses on
78 If no outer addresses are specified, this usage has no effect.
81 takes the following optional argument:
84 Display information associated all generic IP tunnel interfaces.
87 Please note that it is very easy to create infinite routing loop,
88 when you configure tunnel over same address family
93 If you would like to configure IPv6 over IPv4
99 you should perform the following command:
101 # gifconfig gif0 inet 10.1.1.1 10.2.3.4
106 .\" feature to establish a tunnel from host1 to host3
107 .\" which will encapsulate and carry packets from host2, on host1 do:
108 .\" .Bd -literal -offset
109 .\" # ifconfig gif0 inet host1 127.0.0.2 # assign an address to gif0
110 .\" # gifconfig gif0 inet host1 0.0.0.0 # assign encapsulation addresses
111 .\" # route add host2 host3 -ifp gif0: # encap host2 packets, send to host3
116 .\" option to route does not work as documented in
117 .\" most versions of FreeBSD.
120 .\" .Bd -literal -offset
121 .\" # ifconfig gif0 inet host3 127.0.0.2 # assign an address to gif0
122 .\" # gifconfig gif0 inet host3 0.0.0.0 # assign encapsulation addresses
125 .\" Now if you ping host2 from host1, the packets should be encapsulated
126 .\" with outer source address = host1 and outer destination address = host3,
127 .\" and delivered to host3.
128 .\" host3 will decapsulate the packet and deliver it normally to host2.
130 This is also possible to use IPv6 as outer proto, by replacing
134 and IPv4 addresses to some appropriate IPv6 addresses in above example.
136 The command exits with exit status of 1 on errors, 0 on success.
143 command first appeared in WIDE Hydrangea IPv6 protocol stack kit.
145 IPv6 and IPsec support based on the KAME Project (http://www.kame.net/) stack
146 was initially integrated into