4g8(1) User Commands 4g8(1)NAME
4g8 - Packet Capture and Interception for Switched Networks
SYNOPSIS
4g8 -i <device> -g <gw_ip> -G <gw_mac> -s <host_ip> -S <host_mac> [-w file] [-Xh]
DESCRIPTION
4G8 allows you to capture traffic from a third party in a switched environment at the expense of a slight increase in latency to that third
party host. Utilizing ARP cache poisoning, packet capture and packet reconstruction techniques, 4G8 works with nearly all TCP, ICMP and UDP
IPv4 traffic flows.
Required parameters:
-g gw_ip
IP address of gateway to impersonate
-G gw_mac
MAC address of gateway to impersonate
-s host_ip
IP address of victim host
-S host_mac MAC address of victim host
OPTIONS -h Display this message
-i device
Device to listen on
-w file
Write captured data to file
-X Dump the packet in hex and ascii
AUTHORS
4g8 was written by Darren Bounds <dbounds@intrusense.com>
This manpage was written by Marcela Tiznado <mlt@debian.org>
4g8 1.0 August 2007 4g8(1)
Check Out this Related Man Page
FAITH(4) BSD Kernel Interfaces Manual FAITH(4)NAME
faith -- IPv6-to-IPv4 TCP relay capturing interface
SYNOPSIS
pseudo-device faith [count]
DESCRIPTION
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.
SEE ALSO 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.
HISTORY
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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