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1 bwping(8) System Manager's Manual bwping(8)
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.
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
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
18 -4 Forces IPv4 mode. Default mode of operation is IPv4 for bwping and
19 IPv6 for bwping6 otherwise.
21 -6 Forces IPv6 mode. Default mode of operation is IPv4 for bwping and
22 IPv6 for bwping6 otherwise.
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.
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
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.
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.
42 -b kbps
43 Sets the transfer speed in kilobits per second.
45 -s pkt_size
46 Sets the size of ICMP packet (excluding IPv4/IPv6 header) in
49 -v volume
50 Sets the volume to transfer in bytes.
53 Oleg Derevenetz <email@example.com>
56 None known.
59 This utility uses raw sockets to deal with ICMP messages, so root
60 privileges are required to run it.
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:
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;
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.
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.
81 SEE ALSO
82 netstat(1), ping(8)