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 selection 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 select‐
       ing which statistics 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 differ‐
       ence 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 executed. Happens when adding an entry and the  table  is  too
              full.

              unresolved_discards How many neighbor table entries were discarded 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 compatibility 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 expectation 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. Deprecated 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. Deprecated 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 minimum GC interval not reached and routing  cache  not  full.
              Deprecated 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. Deprecated 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,  there‐
              fore always zero.

SEE ALSO
       ip(8)

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)

lnstat Version 0.02 041002
Copyright (C) 2004 by Harald Welte <laforge@gnumonks.org>
This program is free software licensed under GNU GPLv2
with ABSOLUTELY NO WARRANTY.

Parameters:
        -V --version            Print Version of Program
        -c --count <count>      Print <count> number of intervals
        -d --dump               Dump list of available files/keys
        -j --json               Display in JSON format
        -f --file <file>        Statistics file to use
        -h --help               This help message
        -i --interval <intv>    Set interval to 'intv' seconds
        -k --keys k,k,k,...     Display only keys specified
        -s --subject [0-2]      Control header printing:
                                0 = never
                                1 = once
                                2 = every 20 lines (default))
        -w --width n,n,n,...    Width for each field