[ntp:questions] Re: peer trouble ? reach going down

Nicholas Suan nsuan at ryouga.mine.nu
Thu Aug 7 21:56:36 UTC 2003

"David Schwartz" <davids at webmaster.com> wrote in
news:bgub8e$g4m$1 at nntp.webmaster.com: 

> "David J Taylor" <david-taylor at blueyonder.co.uk> wrote in message
> news:APqYa.1175$HB4.10345599 at news-text.cableinet.net...
>> Interesting - I have seen something similar on my own LAN, where
>> there is most unlikely to be packet loss (or so I would have
>> thought....).  None of the other network stuff shows any problems -
>> although perhaps the fact that NTP uses UDP matters?  The internal
>> stuff is polling at 64s intervals.
>     Measure packet loss on your LAN, ideally between the same two
>     machines. 
> Have one ping the other a hundred times, once a second. If you get a
> packet loss of zero, then I'd be suspicious.

The only time I could get any kind of packet loss is flood pinging the 
cable modem, and even then the number of dup. packets matches the number 
lost. (I doubt it's IP stack is anything to write home about. The cabling
going to it is not too hot either.)

[root at tomato ed]# ping -f -c 80000
PING ( from : 56(84) bytes of data.

--- ping statistics ---
80000 packets transmitted, 79995 received, +5 duplicates, 0% loss, time 193957ms
rtt min/avg/max/mdev = 1.280/1.566/45.632/0.668 ms, pipe 3, ipg/ewma 2.424/1.587

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