wping is similar to ping, except it tries to produce more useful output
Estimating packet loss with ping usually involves either eyeballing
the output or developing an intuition for the percentage of lost
packets by looking at the timing of the output. Alternatively, one can
run it in a loop and observe the cumulative statistics that ping
prints out when it exits, then try to follow them over time. We can do
better.
wping calculates and displays an exponential weighted moving average
(EWMA) of the round-trip time and apparent packet loss. For the
purposes of calculating the packet loss, a packet is considered lost
if no response has been received within smoothed(RTT) + 2 *
variation(RTT). If, however, a response arrives for a previously sent
packet, wping will revise the packet loss upward.
When the apparent packet loss drops below 1% (i.e. when packet losses are far enough in the past), the packet loss is reported as 0%.
The EWMA calculation is performed according to RFC6298.
Updated statistics are printed once per send interval: when a response is received or, failing that, when the next probe is about to be sent.
Currently, the way to install wping is via cargo. If cargo is not
avaliable as a distribution package, the easiest way to get it is by
installing rustup and then:
$ cargo install wping
$ sudo setcap cap_net_raw+ep ~/.cargo/bin/wping
On an interface with emulated packet loss:
$ wping en.wikipedia.org
PING 91.198.174.192 for en.wikipedia.org (91.198.174.192)
Seq RTT smooth RTT RTT variation Packet loss
1 96 ms 96 ms 48 ms 0%
2 95 ms 96 ms 36 ms 0%
3 108 ms 97 ms 30 ms 0%
4 100 ms 98 ms 23 ms 0%
- - 98 ms 23 ms 12%
6 97 ms 97 ms 17 ms 11%
7 95 ms 97 ms 14 ms 10%
8 95 ms 97 ms 10 ms 8%
9 96 ms 97 ms 8 ms 7%
10 97 ms 97 ms 6 ms 6%
11 98 ms 97 ms 5 ms 6%
12 97 ms 97 ms 3 ms 5%
- - 97 ms 3 ms 17%
14 96 ms 97 ms 3 ms 15%
15 108 ms 98 ms 5 ms 13%
16 97 ms 98 ms 4 ms 11%
17 97 ms 98 ms 3 ms 10%
- - 98 ms 3 ms 21%
19 96 ms 98 ms 3 ms 18%
20 111 ms 99 ms 5 ms 16%
21 96 ms 99 ms 5 ms 14%
The default send interval is 1s and the adaptive packet loss window
includes 20 probes (the effects of a packet loss event drop to below
1% after that). At startup, wping prints out all IP addresses
retrieved for the target domain as a gentle reminder that round-robin
DNS might be at play.
``` Usage: wping [OPTIONS] [ADDRESS]
positional arguments: address Target hostname or IPv4 address
optional arguments: -h,--help show this help message and exit -i Send interval -s,--packet-size PACKET_SIZE Payload size in bytes --window WINDOW Adaptive packet loss calculation for the last N probes -x,--extended Include additional information in the output ```