I've realized strange behaviour when I started ping from our router through a directy connected frame relay PVC. A few ping packets (just bigger then 1500bytes) run on timeout periodically, however the timeout parameter was set to 10s.
The ping worked fine when I started it from my PC or I started it on an ISDN backup between the same routers.
What can be the reason?
> Protocol [ip]:
> Target IP address: w.x.y.z
> Repeat count : 1000
> Datagram size : 2000
> Timeout in seconds : 8
> Extended commands [n]:
> Sweep range of sizes [n]:
> Type escape sequence to abort.
> Sending 1000, 2000-byte ICMP Echos to w.x.y.z, timeout is 8 seconds:
The pings that were unsuccessful could be teh result of a number of issues. The initiatator has to send an ICMP REQUEST out, and the receive must respond with an ICMP RESPONSE. So either the REQUEST or the RESPONSE, or the fragment of either one, could have been corrupted, dropped, or in error. You could have a look at the stats (interface and buffer) for each device along the way to see if the loss is accounted for anywhere else. Certainly it doesn't make sense that the same ping from a different source would not have any problems, but you need to see where the loss is occurring before there can be any conclusions.
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