LNSTAT(8)		    System Manager's Manual		     LNSTAT(8)



NAME
       lnstat - unified linux network statistics

SYNOPSIS
       lnstat [options]

DESCRIPTION
       This manual page documents briefly the lnstat command.

       lnstat  is  a generalized and more feature-complete replacement for the
       old rtstat program. It is commonly used to periodically print a	selec-
       tion  of	 statistical  values  exported	by the kernel.	In addition to
       routing cache statistics, it supports any kind of statistics the	 linux
       kernel exports via a file in /proc/net/stat/.

       Each  file in /proc/net/stat/ contains a header line listing the column
       names.  These names are used by lnstat as keys for selecting which sta-
       tistics	to  print. For every CPU present in the system, a line follows
       which lists the actual values for each column of the file. lnstat  sums
       these  values  up  (which  in  fact are counters) before printing them.
       After each interval, only the difference to the last value is printed.

       Files and columns may be selected by using the -f and -k parameters. By
       default, all columns of all files are printed.

OPTIONS
       lnstat supports the following options.

       -h, --help
	      Show summary of options.

       -V, --version
	      Show version of program.

       -c, --count <count>
	      Print <count> number of intervals.

       -d, --dump
	      Dump list of available files/keys.

       -f, --file <file>
	      Statistics  file	to  use,  may  be specified multiple times. By
	      default all files in /proc/net/stat are scanned.

       -i, --interval <intv>
	      Set interval to 'intv' seconds.

       -j, --json
	      Display results in JSON format

       -k, --keys k,k,k,...
	      Display  only  keys  specified.  Each  key  k  is	 of  the  form
	      [file:]key.  If <file> is given, the search for the given key is
	      limited to that file. Otherwise the first	 file  containing  the
	      searched key is being used.

       -s, --subject [0-2]
	      Specify  display	of subject/header. '0' means no header at all,
	      '1' prints a header only at start of the program and '2'	prints
	      a header every 20 lines.

       -w, --width n,n,n,...
	      Width for each field.

USAGE EXAMPLES
       # lnstat -d
	      Get a list of supported statistics files.

       # lnstat -k arp_cache:entries,rt_cache:in_hit,arp_cache:destroys
	      Select the specified files and keys.

       # lnstat -i 10
	      Use an interval of 10 seconds.

       # lnstat -f ip_conntrack
	      Use only the specified file for statistics.

       # lnstat -s 0
	      Do not print a header at all.

       # lnstat -s 20
	      Print a header at start and every 20 lines.

       # lnstat -c -1 -i 1 -f rt_cache -k entries,in_hit,in_slow_tot
	      Display  statistics  for keys entries, in_hit and in_slow_tot of
	      field rt_cache every second.


FILES
       /proc/net/stat/arp_cache, /proc/net/stat/ndisc_cache
	      Statistics around neighbor cache and ARP. arp_cache is for IPv4,
	      ndisc_cache is the same for IPv6.

	      entries Number of entries in the neighbor table.

	      allocs How many neighbor entries have been allocated.

	      destroys How many neighbor entries have been removed.

	      hash_grows How often the neighbor (hash) table was increased.

	      lookups How many lookups were performed.

	      hits How many lookups were successful.

	      res_failed How many neighbor lookups failed.

	      rcv_probes_mcast	How many multicast neighbor solicitations were
	      received. (IPv6 only.)

	      rcv_probes_ucast How many unicast	 neighbor  solicitations  were
	      received. (IPv6 only.)

	      periodic_gc_runs How many garbage collection runs were executed.

	      forced_gc_runs How many forced garbage collection runs were exe-
	      cuted. Happens when adding an entry and the table is too full.

	      unresolved_discards How many neighbor table  entries  were  dis-
	      carded due to lookup failure.

	      table_fulls  Number of table overflows. Happens if table is full
	      and forced GC run (see forced_gc_runs) has failed.


       /proc/net/stat/ip_conntrack, /proc/net/stat/nf_conntrack
	      Conntrack related counters. ip_conntrack is for  backwards  com-
	      patibility  with older userspace only and shows the same data as
	      nf_conntrack.

	      entries Number of entries in conntrack table.

	      searched Number of conntrack table lookups performed.

	      found Number of searched entries which were successful.

	      new Number of conntrack entries added which  were	 not  expected
	      before.

	      invalid Number of packets seen which can not be tracked.

	      ignore  Number  of packets seen which are already connected to a
	      conntrack entry.

	      delete Number of conntrack entries which were removed.

	      delete_list Number of conntrack entries which were put to	 dying
	      list.

	      insert Number of entries inserted into the list.

	      insert_failed  Number  of	 entries  for which list insertion was
	      attempted but failed (happens  if	 the  same  entry  is  already
	      present).

	      drop  Number of packets dropped due to conntrack failure. Either
	      new  conntrack  entry  allocation	 failed,  or  protocol	helper
	      dropped the packet.

	      early_drop  Number of dropped conntrack entries to make room for
	      new ones, if maximum table size was reached.

	      icmp_error Number of packets which could not be tracked  due  to
	      error situation. This is a subset of invalid.

	      expect_new  Number  of conntrack entries added after an expecta-
	      tion for them was already present.

	      expect_create Number of expectations added.

	      expect_delete Number of expectations deleted.

	      search_restart Number of conntrack table lookups which had to be
	      restarted due to hashtable resizes.


       /proc/net/stat/rt_cache
	      Routing cache statistics.

	      entries Number of entries in routing cache.

	      in_hit  Number  of route cache hits for incoming packets. Depre-
	      cated since IP route cache removal, therefore always zero.

	      in_slow_tot Number of routing  cache  entries  added  for	 input
	      traffic.

	      in_slow_mc  Number  of multicast routing cache entries added for
	      input traffic.

	      in_no_route Number of input packets for which no	routing	 table
	      entry was found.

	      in_brd Number of matched input broadcast packets.

	      in_martian_dst Number of incoming martian destination packets.

	      in_martian_src Number of incoming martian source packets.

	      out_hit  Number of route cache hits for outgoing packets. Depre-
	      cated since IP route cache removal, therefore always zero.

	      out_slow_tot Number of routing cache entries  added  for	output
	      traffic.

	      out_slow_mc  Number of multicast routing cache entries added for
	      output traffic.

	      gc_total Total number of	garbage	 collection  runs.  Deprecated
	      since IP route cache removal, therefore always zero.

	      gc_ignored Number of ignored garbage collection runs due to min-
	      imum GC interval not reached and routing cache not full.	Depre-
	      cated since IP route cache removal, therefore always zero.

	      gc_goal_miss Number of garbage collector goal misses. Deprecated
	      since IP route cache removal, therefore always zero.

	      gc_dst_overflow Number of destination  cache  overflows.	Depre-
	      cated since IP route cache removal, therefore always zero.

	      in_hlist_search  Number  of hash table list traversals for input
	      traffic. Deprecated since	 IP  route  cache  removal,  therefore
	      always zero.

	      out_hlist_search Number of hash table list traversals for output
	      traffic. Deprecated since	 IP  route  cache  removal,  therefore
	      always zero.


SEE ALSO
       ip(8),  and  /usr/share/doc/iproute-doc/README.lnstat (package iproute-
       doc on Debian)

AUTHOR
       lnstat was written by Harald Welte <laforge@gnumonks.org>.

       This manual page was written by Michael Prokop <mika@grml.org> for  the
       Debian project (but may be used by others).



								     LNSTAT(8)