Chapter 2. The

proc

File System

43

  dev_mcast

  Displays the various Layer2 multicast groups each device is listening to.

  igmp

  Lists the IP multicast addresses which this system joined.

  ip_fwchains

  If

ipchains

are in use, this virtual file reveals any current rule.

  ip_fwnames

  If

ipchains

are in use, this virtual file lists all firewall chain names.

  ip_masquerade

  Provides a table of masquerading information under

ipchains

.

  ip_mr_cache

  List of the multicast routing cache.

  ip_mr_vif

  List of multicast virtual interfaces.

  netstat

  Contains a broad yet detailed collection of networking statistics, including TCP time 

outs, SYN cookies sent and received, and much more.

  psched

  List of global packet scheduler parameters.

  raw

  List of raw device statistics.

  route

  Displays the kernel's routing table.

  rt_cache

  Contains the current routing cache.

  snmp

  List of Simple Network Management Protocol (SNMP) data for various networking pro 

tocols in use.

  sockstat

  Provides socket statistics.

  tcp

  Contains detailed TCP socket information.

  tr_rif

  The token ring RIF routing table.

  udp

  Contains detailed UDP socket information.

  unix

  Lists UNIX domain sockets currently in use.

  wireless

  Lists wireless interface data.

2.3.8.

/proc/scsi/

This directory is analogous to the

/proc/ide/

directory only it is for connected SCSI devices.

The primary file in this directory is

/proc/scsi/scsi

, which contains a list of every recognized

SCSI device. From this listing, the type of devices, as well as the model name, vendor, SCSI channel

and ID data is available.

For example, if a system contains a SCSI CD ROM, tape drive, hard drives, and RAID controller, this

file would look similar to this:

Attached devices:

Host: scsi1 Channel: 00 Id: 05 Lun: 00

Vendor: NEC

Model: CD ROM DRIVE:466 Rev: 1.06

Type:

CD ROM

ANSI SCSI revision: 02

Host: scsi1 Channel: 00 Id: 06 Lun: 00

Vendor: ARCHIVE

Model: Python 04106 XXX Rev: 7350

Type:

Sequential Access

ANSI SCSI revision: 02

Host: scsi2 Channel: 00 Id: 06 Lun: 00

Vendor: DELL

Model: 1x6 U2W SCSI BP

Rev: 5.35

Type:

Processor

ANSI SCSI revision: 02

Host: scsi2 Channel: 02 Id: 00 Lun: 00

Vendor: MegaRAID Model: LD0 RAID5 34556R Rev: 1.01

Type:

Direct Access

ANSI SCSI revision: 02

Each SCSI driver used by the system has its own directory in

/proc/scsi/

, which contains files

specific to each SCSI controller using that driver. So, for the example system above,

aic7xxx

and