Believe it or not, this is an OLD bug in ping... search the archives -- I analyzed and posted the info quite a while back (over a year IIRC). The problem can happen when your link is quite busy and ping response are delayed longer than the ping timeout value... it's a race condition in ping... look for other traffic on the link.
HTH, Pierre On Sat, 7 Sep 2002 10:07:51 -0400 Randy Kramer <[EMAIL PROTECTED]> wrote: > Background: In conjunction with running fetchmail every 10 minutes, I > ping my ISP before running fetchmail. (My script is set up so that > when I get "0% packet loss" on a sequence of 4 pings, it runs fetchmail > (and then sendmail -q to kick the queue).) > > Fairly often (several times a day?), I get one or more pings with an > error message like: > > wrong data byte #0 should be 0x59 but was ... (see complete ping > response, below:) > > Complete ping response: > > PING 206.245.176.211 (206.245.176.211): 56 octets data > 64 octets from 206.245.176.211: icmp_seq=0 ttl=122 time=1099.4 ms > wrong data byte #0 should be 0x59 but was 0x5858 ff 79 3d 79 6b a 0 > ��������8 9 a b c d e f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f > 20 21 22 23 24 25 26 27 > ��������28 29 2a 2b 2c 2d 2e 2f > 64 octets from 206.245.176.211: icmp_seq=1 ttl=122 time=268.4 ms > 64 octets from 206.245.176.211: icmp_seq=2 ttl=122 time=283.4 ms > 64 octets from 206.245.176.211: icmp_seq=3 ttl=122 time=251.6 ms > > In the above case, the wrong data byte occurred for only one of the > pings -- in other cases it occurs for 2, 3, or 4 (all of the) pings, > but usually (always?) for the earliest pings rather than the last pings. > > Questions: What is this telling me and/or how does it occur? This box > is on a coax LAN, so I suppose it could be seeing TCP/IP traffic not > meant for it -- is that likely to be the problem, or noise, or ??? > What can I do to fix it? (I can't easily convert the LAN to TP as I'd > have to run new cable which I prefer not to do in the near future -- > maybe in a few years.) > > I suppose I should run a sniffer on the network, but there really > should not be a lot of traffic. Can anybody recommend a sniffer that > comes with Mandrake 7.2 or 8.2 (i.e., so I can install from an rpm)? > > thanks, > Randy Kramer > > >
Want to buy your Pack or Services from MandrakeSoft? Go to http://www.mandrakestore.com
