1 The following instructions are applicable to Tru64 UNIX 2 (formerly Digital UNIX (formerly DEC OSF/1)) version 4.0, and 3 probably to later versions as well; at least some options apply to 4 Digital UNIX 3.2 - perhaps all do. 5 6 In order to use kernel packet filtering on this system, you have 7 to configure it in such a way: 8 9 Kernel configuration 10 -------------------- 11 12 The packet filtering kernel option must be enabled at kernel 13 installation. If it was not the case, you can rebuild the kernel with 14 "doconfig -c" after adding the following line in the kernel 15 configuration file (/sys/conf/<HOSTNAME>): 16 17 option PACKETFILTER 18 19 or use "doconfig" without any arguments to add the packet filter driver 20 option via the kernel option menu (see the system administration 21 documentation for information on how to do this). 22 23 Device configuration 24 -------------------- 25 26 Devices used for packet filtering must be created thanks to 27 the following command (executed in the /dev directory): 28 29 ./MAKEDEV pfilt 30 31 Interface configuration 32 ----------------------- 33 34 In order to capture all packets on a network, you may want to allow 35 applications to put the interface on that network into "local copy" 36 mode, so that tcpdump can see packets sent by the host on which it's 37 running as well as packets received by that host, and to put the 38 interface into "promiscuous" mode, so that tcpdump can see packets on 39 the network segment not sent to the host on which it's running, by using 40 the pfconfig(1) command: 41 42 pfconfig +c +p <network_device> 43 44 or allow application to put any interface into "local copy" or 45 "promiscuous" mode by using the command: 46 47 pfconfig +c +p -a 48 49 Note: all instructions given require root privileges. 50