Warning: time of day goes back, taking countermeasures.(?)

[Jake]

Any ideas on what this means?

[error at invictus error]$ ping 10.0.0.23
PING 10.0.0.23 (10.0.0.23) from 10.0.0.1 : 56(84) bytes of data.
Warning: time of day goes back, taking countermeasures.
64 bytes from 10.0.0.23: icmp_seq=0 ttl=255 time=3.069 msec
64 bytes from 10.0.0.23: icmp_seq=1 ttl=255 time=2.261 msec

--- 10.0.0.23 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/mdev = 2.261/2.665/3.069/0.404 ms



Why does the time of day go back? What countermeasures is it taking?

It seems strange...
-
Jake