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if_ipsec(4)		     Kernel Interfaces Manual		     if_ipsec(4)

NAME
     if_ipsec -- IPsec virtual tunneling interface

SYNOPSIS
     The if_ipsec network interface is a part of the FreeBSD IPsec
     implementation.  To compile it into the kernel, place this line in the
     kernel configuration file:

	   options IPSEC

     It can also be loaded as part of the ipsec kernel module if the kernel was
     compiled with

	   options IPSEC_SUPPORT

DESCRIPTION
     The  if_ipsec  network interface is targeted for creating route-based VPNs.
     It can tunnel IPv4 and IPv6 traffic over either IPv4 or IPv6 and secure  it
     with ESP.

     if_ipsec  interfaces  are dynamically created and destroyed with the ifcon-
     fig(8) create and destroy subcommands.  The  administrator  must  configure
     IPsec  tunnel  endpoint  addresses.   These  addresses will be used for the
     outer IP header of ESP packets.  The administrator can also  configure  the
     protocol and addresses for the inner IP header with ifconfig(8), and modify
     the routing table to route the packets through the if_ipsec interface.

     When the if_ipsec interface is configured, it automatically creates special
     security policies.  These policies can be used to acquire security associa-
     tions  from the IKE daemon, which are needed for establishing an IPsec tun-
     nel.  It is also possible to create needed security  associations	manually
     with the setkey(8) utility.

     Each  if_ipsec  interface	has  an  additional numeric configuration option
     reqid id.	This id is used to distinguish traffic and security policies be-
     tween several if_ipsec interfaces.  The reqid can be specified on interface
     creation and changed later.  If not  specified,  it  is  automatically  as-
     signed.   Note  that changing reqid will lead to generation of new security
     policies, and this may require creating new security associations.

EXAMPLES
     The example below shows manual configuration of an IPsec tunnel between two
     FreeBSD hosts.  Host A has the IP address 192.168.0.3, and host B	has  the
     IP address 192.168.0.5.

     On host A:

	   ifconfig ipsec0 create reqid 100
	   ifconfig ipsec0 inet tunnel 192.168.0.3 192.168.0.5
	   ifconfig ipsec0 inet 172.16.0.3/16 172.16.0.5
	   setkey -c
	   add 192.168.0.3 192.168.0.5 esp 10000 -m tunnel -u 100 -E rijndael-cbc "VerySecureKey!!1";
	   add 192.168.0.5 192.168.0.3 esp 10001 -m tunnel -u 100 -E rijndael-cbc "VerySecureKey!!2";
	   ^D

     On host B:

	   ifconfig ipsec0 create reqid 200
	   ifconfig ipsec0 inet tunnel 192.168.0.5 192.168.0.3
	   ifconfig ipsec0 inet 172.16.0.5/16 172.16.0.3
	   setkey -c
	   add 192.168.0.3 192.168.0.5 esp 10000 -m tunnel -u 200 -E rijndael-cbc "VerySecureKey!!1";
	   add 192.168.0.5 192.168.0.3 esp 10001 -m tunnel -u 200 -E rijndael-cbc "VerySecureKey!!2";
	   ^D

     Note  the	value  100  on host A and value 200 on host B are used as reqid.
     The same value must be used as  identifier  of  the  policy  entry  in  the
     setkey(8) command.

SEE ALSO
     gif(4), gre(4), ipsec(4), ifconfig(8), setkey(8)

AUTHORS
     Andrey V. Elsukov <ae@FreeBSD.org>

FreeBSD ports 15.quarterly	February 6, 2017		     if_ipsec(4)

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