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OpenDarwin 7.2.1 - man page for faith (opendarwin section 4)

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

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

     pseudo-device faith [count]

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

     Special action will be taken when IPv6 TCP traffic is seen on a router, and routing table
     suggests to route it to faith interface.  In this case, the packet will be accepted by the
     router, regardless of list of IPv6 interface addresses assigned to the router.  The packet
     will be captured by an IPv6 TCP socket, if it has IN6P_FAITH flag turned on and it has
     matching address/port pairs.  In 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 specific 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.

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

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

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

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

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

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

     Jun-ichiro itojun Hagino and Kazu Yamamoto, An IPv6-to-IPv4 transport relay translator,
     internet draft, draft-ietf-ngtrans-tcpudp-relay-04.txt, work in progress material.

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

BSD					  April 10, 1999				      BSD

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