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

Warren Raquel warquel at hotmail.com
Sun Nov 4 20:13:54 PST 2001

It's nothing to worry about. As a matter of fact, you'll notice that this 
happens when you run ping on localhost. I can't remember what the problem is 
but it has something to do with a small bug in the kernel dealing with 
timestamp comparisions. I have all my systems syncing with a time server 
daily and still run into the problem. You can make this message disappear by 
using '-U' in your ping command. This will disable some of the newer 
features of ping in the newer kernel which, in turn, automagically fixes the 

  ping -U

Warren Raquel MCP CCNA

- Just another geek.

>From: "Jake" <Jake at callatg.com>
>Reply-To: <talk at nblug.org>
>To: "00 nblugTalk" <talk at nblug.org>
>Subject: Warning: time of day goes back, taking countermeasures.(?)
>Date: Sun, 4 Nov 2001 19:48:38 -0800
>Any ideas on what this means?
>[error at invictus error]$ ping
>PING ( from : 56(84) bytes of data.
>Warning: time of day goes back, taking countermeasures.
>64 bytes from icmp_seq=0 ttl=255 time=3.069 msec
>64 bytes from icmp_seq=1 ttl=255 time=2.261 msec
>--- 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...

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