bwping and bwping6 are tools to measure bandwidth and response times between two hosts using Internet Control Message Protocol (ICMP) echo request/echo reply mechanism.
bwping [ -4 | -6 ] [ -u buf_size ] [ -r reporting_period ] [ -T tos(v4) | traf_class(v6) ] [ -B bind_addr ] -b kbps -s pkt_size -v volume target
bwping6 [ -4 | -6 ] [ -u buf_size ] [ -r reporting_period ] [ -T tos(v4) | traf_class(v6) ] [ -B bind_addr ] -b kbps -s pkt_size -v volume target
Forces IPv4 mode. Default mode of operation is IPv4 for bwping and IPv6 for bwping6 otherwise.
Forces IPv6 mode. Default mode of operation is IPv4 for bwping and IPv6 for bwping6 otherwise.
Sets the send/receive buffer size in bytes. Default value will be automatically calculated based on transfer speed, packet size and host timer accuracy.
Sets the interval time in seconds between periodic bandwidth, RTT, and loss reports. If zero, there will be no periodic reports (default).
-T tos(v4) | traf_class(v6)
Sets the TOS (in IPv4 mode) or Traffic Class (in IPv6 mode) value of outgoing ip packets. Default value is zero.
Sets the source address of outgoing ip packets. By default the address of the outgoing interface will be used.
Sets the transfer speed in kilobits per second.
Sets the size of ICMP packet (excluding IPv4/IPv6 header) in bytes.
Sets the volume to transfer in bytes.
Oleg Derevenetz <firstname.lastname@example.org>
This utility uses raw sockets to deal with ICMP messages, so root privileges are required to run it.
Although bwping and bwping6 does not require any special software on the remote host (only the ability to respond on ICMP echo request messages), there are some special requirements to network infrastructure, local and remote host performance:
1. There should be no ICMP echo request/reply filtering on the network. This includes QoS mechanisms (which often affects ICMP) at any point in the testing path;
2. Local host should have enough CPU resources to send ICMP echo request messages with given rate, and remote host should quickly respond on these messages and should have no ICMP bandwidth limiting turned on.
If some of these requirements are not satisfied, then measurement results will be inadequate or fail completely. In general, for testing bandwidth where QoS is implemented, always test with traffic that matches the QoS class to be tested.