299Ppacket filtering(See iptables)PAMadditional resources, 237installed documentation, 237useful websites, 237advantages of, 229configuration files, 229control flags, 231definition of, 229Kerberos and, 269modules, 230arguments, 231components, 230creating, 234interfaces, 230location of, 231stacking, 230, 232pam_consoledefinition of, 235pam_timestampauthentication icon and, 234definition of, 234destroying timestamps, 235directives, 235pam_timestamp_checkdestroying timestamp using, 235sample configuration files, 232service files, 229shadow passwords, 232pam_console(See PAM)pam_timestamp(See PAM)pam_timestamp_check(See PAM)password, 232(See Also PAM)shadow passwords, 232passwordsshadow, 84PidFileApache configuration directive, 139Pluggable Authentication Modules(See PAM)portmap, 114(See Also NFS)NFS, 115rpcinfo, 115status, 115Postfix, 166default installation, 166prefdm(See XFree86)proc directory, 27proc file system/proc/apm, 47/proc/bus/ directory, 62/proc/cmdline, 47/proc/cpuinfo, 47/proc/devicesblock devices, 48character devices, 48/proc/dma, 49/proc/driver/ directory, 63/proc/execdomains, 49/proc/fb, 49/proc/filesystems, 50/proc/fs/ directory, 63/proc/ide directorydevice directories, 64/proc/ide/ directory, 64/proc/interrupts, 50/proc/iomem, 51/proc/ioports, 51/proc/irq/ directory, 65/proc/isapnp, 52/proc/kcore, 53/proc/kmsg, 53/proc/ksyms, 53/proc/loadavg, 53/proc/locks, 54/proc/mdstat, 54/proc/meminfo, 54/proc/misc, 56/proc/modules, 56/proc/mounts, 57/proc/mtrr, 57/proc/net/ directory, 65/proc/partitions, 57/proc/pciviewing using lspci, 57/proc/scsi/ directory, 66/proc/self/ directory, 62/proc/slabinfo, 58/proc/stat, 59/proc/swaps, 60/proc/sys/ directory, 68, 76(See Also sysctl)/proc/sys/dev/ directory, 69/proc/sys/fs/ directory, 69/proc/sys/kernel/ directory, 70/proc/sys/kernel/sysrq(See system request key)/proc/sys/net/ directory, 73/proc/sys/vm/ directory, 74/proc/sysrq-trigger, 59/proc/sysvipc/ directory, 76/proc/tty/ directory, 76/proc/uptime, 60