Theodore Baschak

BOFH. Open Source Guru. Founder/Operator of Hextet Systems, AS395089 and Network Architect for Daemon Defense Systems, AS55101.

fpinglog

Thu, 02 Feb 2017 16:12:17 -0600 » Networking, Nerd Projects, Network Monitoring, CLI, IPv6, Programming, ISP, System Administration

I’ve often wished for a way of logging pings when troubleshooting connectivity problems. Today I revisited the problem using fping.

fping and fping6 both have options to run a continuous ping (-l), and when combined with -D to insert the unix timestamp, can log the latency and loss to a destination in 1s increments.

When working with unix timestamps, the following one-liner is handy:

perl -pe 's/(\d+)/localtime($1)/e'

$ fping -D -l www | tee www-pings 
[1486087249.709072] www : [0], 84 bytes, 0.38 ms (0.38 avg, 0% loss)
[1486087250.709110] www : [1], 84 bytes, 0.32 ms (0.35 avg, 0% loss)
[1486087251.709555] www : [2], 84 bytes, 0.38 ms (0.36 avg, 0% loss)
[1486087252.710094] www : [3], 84 bytes, 0.54 ms (0.40 avg, 0% loss)
[1486087253.710228] www : [4], 84 bytes, 0.30 ms (0.38 avg, 0% loss)
[1486087254.711275] www : [5], 84 bytes, 0.31 ms (0.37 avg, 0% loss)
[1486087255.712327] www : [6], 84 bytes, 0.32 ms (0.36 avg, 0% loss)
[1486087256.713359] www : [7], 84 bytes, 0.32 ms (0.35 avg, 0% loss)
[1486087257.713911] www : [8], 84 bytes, 0.38 ms (0.36 avg, 0% loss)
[1486087258.714303] www : [9], 84 bytes, 0.29 ms (0.35 avg, 0% loss)
[1486087259.714810] www : [10], 84 bytes, 0.32 ms (0.35 avg, 0% loss)
[1486087260.715870] www : [11], 84 bytes, 0.33 ms (0.34 avg, 0% loss)
^C
www : xmt/rcv/%loss = 12/12/0%, min/avg/max = 0.29/0.34/0.54

This also logs the output to a file named www-pings.

The above commands can also all be combined onto one (modified to handle the precision of the unix timestamp)

$ fping -D -l www | tee www-pings | perl -pe 's/(\d+\.\d+)/localtime($1)/e'
[Thu Feb  2 20:02:41 2017] www : [0], 84 bytes, 2.05 ms (2.05 avg, 0% loss)
[Thu Feb  2 20:02:42 2017] www : [1], 84 bytes, 0.26 ms (1.15 avg, 0% loss)
[Thu Feb  2 20:02:43 2017] www : [2], 84 bytes, 0.29 ms (0.86 avg, 0% loss)
[Thu Feb  2 20:02:44 2017] www : [3], 84 bytes, 0.36 ms (0.74 avg, 0% loss)
[Thu Feb  2 20:02:45 2017] www : [4], 84 bytes, 0.30 ms (0.65 avg, 0% loss)
[Thu Feb  2 20:02:46 2017] www : [5], 84 bytes, 0.27 ms (0.58 avg, 0% loss)
^C
www : xmt/rcv/%loss = 6/6/0%, min/avg/max = 0.26/0.58/2.05
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