At 14:48 09/01/2008, Janice Losgar wrote:
Andrey,
You can't compare the round-trip time of ping packets with an SNMP probe.
For SNMP probes, round-trip time is calculated by the time it takes for the
last packet sent to come back. In an SNMP probe with several variables, we
send one request for all the variables. The round-trip time is the sum of
the time it takes to retrieve all the information, which would be much
different than a simple ping request.
Regards,
Janice Losgar
Dartware, LLC
In fact, something like this gave us a bad result. We are a few msec away from our router at our London PoP. I was asking this router, via IM, for the size of the routing table. The RTT was around 1000msec. On enquiry to our vendor, it appeared that the
router was doing a brute force count at a low priority to execute the SNMP request.
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