1353141SphilipThe following instructions are applicable to Tru64 UNIX 2353141Sphilip(formerly Digital UNIX (formerly DEC OSF/1)) version 4.0, and 3353141Sphilipprobably to later versions as well; at least some options apply to 4353141SphilipDigital UNIX 3.2 - perhaps all do. 5353141Sphilip 6353141SphilipIn order to use kernel packet filtering on this system, you have 7353141Sphilipto configure it in such a way: 8353141Sphilip 9353141SphilipKernel configuration 10353141Sphilip-------------------- 11353141Sphilip 12353141SphilipThe packet filtering kernel option must be enabled at kernel 13353141Sphilipinstallation. If it was not the case, you can rebuild the kernel with 14353141Sphilip"doconfig -c" after adding the following line in the kernel 15353141Sphilipconfiguration file (/sys/conf/<HOSTNAME>): 16353141Sphilip 17353141Sphilip option PACKETFILTER 18353141Sphilip 19353141Sphilipor use "doconfig" without any arguments to add the packet filter driver 20353141Sphilipoption via the kernel option menu (see the system administration 21353141Sphilipdocumentation for information on how to do this). 22353141Sphilip 23353141SphilipDevice configuration 24353141Sphilip-------------------- 25353141Sphilip 26353141SphilipDevices used for packet filtering must be created thanks to 27353141Sphilipthe following command (executed in the /dev directory): 28353141Sphilip 29353141Sphilip ./MAKEDEV pfilt 30353141Sphilip 31353141SphilipInterface configuration 32353141Sphilip----------------------- 33353141Sphilip 34353141SphilipIn order to capture all packets on a network, you may want to allow 35353141Sphilipapplications to put the interface on that network into "local copy" 36353141Sphilipmode, so that tcpdump can see packets sent by the host on which it's 37353141Sphiliprunning as well as packets received by that host, and to put the 38353141Sphilipinterface into "promiscuous" mode, so that tcpdump can see packets on 39353141Sphilipthe network segment not sent to the host on which it's running, by using 40353141Sphilipthe pfconfig(1) command: 41353141Sphilip 42353141Sphilip pfconfig +c +p <network_device> 43353141Sphilip 44353141Sphilipor allow application to put any interface into "local copy" or 45353141Sphilip"promiscuous" mode by using the command: 46353141Sphilip 47353141Sphilip pfconfig +c +p -a 48353141Sphilip 49353141SphilipNote: all instructions given require root privileges. 50