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LEARN ABOUT OSF1
iptunnel
iptunnel(8) System Manager's Manual iptunnel(8)
NAME
iptunnel - Creates, deletes, and displays configured tunnels
SYNOPSIS
/usr/sbin/iptunnel [operation] [args]
DESCRIPTION
The iptunnel command creates configured tunnels for sending and receiving IPV6 or IPV4 packets that are encapsulated as the payload of an
IPV4 datagram.
The iptunnel command can perform one of the following operations: Creates a tunnel interface, which you must subsequently configure by
using the ifconfig command. The syntax of the create operation is as follows:
iptunnel create [-I int-name] [v4-dest] [v4-src]
Specifies the interface unit of the tunnel to be created. This is an optional parameter. The int-name parameter has the following
form: iptx, where x is the interface unit number. By default, the interface name selected for the tunnel is iptx+1, or the value of
the interface unit number of the last tunnel created plus 1. Specifies the remote end-point to which a tunnel is to be created.
Sets the IPV4 source address in the encapsulating header. The tunnel is enabled (packets are sent/received on the tunnel) only if
v4-src is a valid address on the system. This is an optional parameter. Deletes a tunnel interface. You must disable the tunnel
before you can delete it by executing the following command: # ifconfig tunnel name down delete abort Shows the tunnel attributes
(name, tunnel end points, next hop for tunneled packets).
EXAMPLES
To create a tunnel from hobbes to calvin, enter: # iptunnel create -I ipt5 calvin ipt5 iftype 208 src 16.140.16.86 dst 16.140.16.91
To display the tunnel attributes, enter: # iptunnel show ipt5 interface ipt5 src 16.140.16.86 dst 16.140.16.91 gate 16.140.16.86 To config-
uring the tunnel to encapsulate IPv6 packets, enter: # ifconfig ipt5 ipv6 up
IPv6 packets will be sent as payloads of IPv4 datagrams from 16.140.16.86 to 16.140.16.91.
The tunnel may also be used to send IPV4 packets encapsulated within IPV4 headers as follows: # ifconfig ipt5 10.10.80.60 netmask
255.255.255.0
To verify the previous command, enter: # ifconfig ipt5 ipt5: flags=4c1<UP,RUNNING,NOARP,MULTICAST>
16.140.16.86 --> 16.140.16.91
rxmt 1000, reach time 30000, dad tries 1, mtu 1280, hops 64, token len 64
inet 10.10.80.60 netmask ffffff00 ipmtu 1280
inet6 fe80::108c:1056 To deleting the tunnel, enter: # ifconfig ipt5 down delete abort ipt5: delete inet address 10.10.80.60
10.10.80.60: aborting 0 tcp connection(s)
Then, enter: # iptunnel delete ipt5 interface ipt5 deleted
SEE ALSO
Commands: ifconfig(8).
RFC 2003, IP Encapsulation within IP, Perkins, C., October 1996
iptunnel(8)
