NAME | SYNOPSIS | DESCRIPTION | OPTIONS | USAGE EXAMPLES | FILES | SEE ALSO | AUTHOR | COLOPHON

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

NAME         top

       lnstat - unified linux network statistics

SYNOPSIS         top

       lnstat [options]

DESCRIPTION         top

       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 selecting
       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 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         top

       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         top

       # 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         top

       /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,
              therefore always zero.

SEE ALSO         top

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

AUTHOR         top

       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).

COLOPHON         top

       This page is part of the iproute2 (utilities for controlling TCP/IP
       networking and traffic) project.  Information about the project can
       be found at 
       ⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
       If you have a bug report for this manual page, send it to
       netdev@vger.kernel.org, shemminger@osdl.org.  This page was obtained
       from the project's upstream Git repository 
       ⟨git://git.kernel.org/pub/scm/linux/kernel/git/shemminger/iproute2.git⟩
       on 2017-03-13.  If you discover any rendering problems in this HTML
       version of the page, or you believe there is a better or more up-to-
       date source for the page, or you have corrections or improvements to
       the information in this COLOPHON (which is not part of the original
       manual page), send a mail to man-pages@man7.org

                                                                   LNSTAT(8)