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    1 bwping(8)                   System Manager's Manual                  bwping(8)
    2 
    3 NAME
    4        bwping  and  bwping6  are tools to measure bandwidth and response times
    5        between two hosts using Internet Control Message Protocol  (ICMP)  echo
    6        request/echo reply mechanism.
    7 
    8 SYNOPSIS
    9        bwping [ -4 | -6 ] [ -u buf_size ] [ -r reporting_period ] [ -T tos(v4)
   10        | traf_class(v6) ] [ -B bind_addr ]  -b  kbps  -s  pkt_size  -v  volume
   11        target
   12 
   13        bwping6  [  -4  |  -6  ]  [  -u buf_size ] [ -r reporting_period ] [ -T
   14        tos(v4) | traf_class(v6) ] [ -B bind_addr ]  -b  kbps  -s  pkt_size  -v
   15        volume target
   16 
   17 OPTIONS
   18        -4   Forces IPv4 mode. Default mode of operation is IPv4 for bwping and
   19             IPv6 for bwping6 otherwise.
   20 
   21        -6   Forces IPv6 mode. Default mode of operation is IPv4 for bwping and
   22             IPv6 for bwping6 otherwise.
   23 
   24        -u buf_size
   25             Sets  the send/receive buffer size in bytes. Default value will be
   26             automatically calculated based on transfer speed, packet size  and
   27             host timer accuracy.
   28 
   29        -r reporting_period
   30             Sets the interval time in seconds between periodic bandwidth, RTT,
   31             and loss reports. If zero,  there  will  be  no  periodic  reports
   32             (default).
   33 
   34        -T tos(v4) | traf_class(v6)
   35             Sets  the TOS (in IPv4 mode) or Traffic Class (in IPv6 mode) value
   36             of outgoing ip packets. Default value is zero.
   37 
   38        -B bind_addr
   39             Sets the source address of outgoing ip  packets.  By  default  the
   40             address of the outgoing interface will be used.
   41 
   42        -b kbps
   43             Sets the transfer speed in kilobits per second.
   44 
   45        -s pkt_size
   46             Sets  the  size  of  ICMP  packet  (excluding IPv4/IPv6 header) in
   47             bytes.
   48 
   49        -v volume
   50             Sets the volume to transfer in bytes.
   51 
   52 AUTHORS
   53        Oleg Derevenetz <oleg.derevenetz@gmail.com>
   54 
   55 BUGS
   56        None known.
   57 
   58 NOTES
   59        This utility uses raw sockets to  deal  with  ICMP  messages,  so  root
   60        privileges are required to run it.
   61 
   62        Although  bwping  and  bwping6 does not require any special software on
   63        the remote host (only the ability  to  respond  on  ICMP  echo  request
   64        messages),   there   are   some   special   requirements   to   network
   65        infrastructure, local and remote host performance:
   66 
   67        1. There should be no ICMP echo request/reply filtering on the network.
   68        This includes QoS mechanisms (which often affects ICMP) at any point in
   69        the testing path;
   70 
   71        2. Local host should have  enough  CPU  resources  to  send  ICMP  echo
   72        request  messages  with  given  rate,  and  remote  host should quickly
   73        respond on these messages and should have no  ICMP  bandwidth  limiting
   74        turned on.
   75 
   76        If  some  of  these  requirements  are  not satisfied, then measurement
   77        results will be inadequate or fail completely. In general, for  testing
   78        bandwidth  where  QoS  is  implemented,  always  test with traffic that
   79        matches the QoS class to be tested.
   80 
   81 SEE ALSO
   82        netstat(1), ping(8)
   83 
   84                                                                      bwping(8)