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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 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
       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.

       -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 -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.
              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, there‐
              fore 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,  there‐

SEE ALSO
       ip(8), and /usr/share/doc/iproute-3.10.0/README.lnstat (package iproute-doc on Debian)

AUTHOR
       lnstat was written by Harald Welte <[email protected]>.

       This manual page was written by Michael Prokop <[email protected]> for the Debian project (but may be used by oth‐
       ers).



                                                                                                            LNSTAT(8)