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NetBSD 6.1.5 - man page for faith (netbsd section 4)

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FAITH(4)			   BSD Kernel Interfaces Manual 			 FAITH(4)

NAME
     faith -- IPv6-to-IPv4 TCP relay capturing interface

SYNOPSIS
     pseudo-device faith

DESCRIPTION
     The faith interface captures IPv6 TCP traffic, for implementing userland IPv6-to-IPv4 TCP
     relay like faithd(8).

     faith interfaces are dynamically created and destroyed with the ifconfig(8) create and
     destroy subcommands.

     Special action will be taken when IPv6 TCP traffic is seen on a router, and the routing ta-
     ble suggests to route it to the faith interface.  In this case, the packet will be accepted
     by the router, regardless of the list of IPv6 interface addresses assigned to the router.
     The packet will be captured by an IPv6 TCP socket, if it has the IN6P_FAITH flag turned on
     and matching address/port pairs.  As a result, faith will let you capture IPv6 TCP traffic
     to some specific destination addresses.  Userland programs, such as faithd(8) can use this
     behavior to relay IPv6 TCP traffic to IPv4 TCP traffic.  The program can accept some spe-
     cific IPv6 TCP traffic, perform getsockname(2) to get the IPv6 destination address specified
     by the client, and perform application-specific address mapping to relay IPv6 TCP to IPv4
     TCP.

     IN6P_FAITH flag on an IPv6 TCP socket can be set by using setsockopt(2), with level
     IPPROTO_IPV6 and optname IPv6_FAITH.

     To handle error reports by ICMPv6, some ICMPv6 packets routed to an faith interface will be
     delivered to IPv6 TCP, as well.

     To understand how faith can be used, take a look at the source code of faithd(8).

     As the faith interface implements potentially dangerous operations, great care must be taken
     when configuring it.  To avoid possible misuse, the sysctl(8) variable
     net.inet6.ip6.keepfaith must be set to 1 prior to using the interface.  When
     net.inet6.ip6.keepfaith is 0, no packets will be captured by the faith interface.

     The faith interface is intended to be used on routers, not on hosts.

SEE ALSO
     inet(4), inet6(4), faithd(8)

     Jun-ichiro itojun Hagino and Kazu Yamamoto, "An IPv6-to-IPv4 transport relay translator",
     RFC 3142, ftp://ftp.isi.edu/in-notes/rfc3142.txt, June 2001.

HISTORY
     The FAITH IPv6-to-IPv4 TCP relay translator first appeared in the WIDE hydrangea IPv6 stack.

BSD					 January 9, 2010				      BSD
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