On 2012-12-10 22:29, Glen Wernersbach wrote: > Jan or RTNet developers, > > > We are planning to have a host DHCP server computer assigned ip address to a > number of our devices which are daisy chained together via an a 2 port > switch on each of our devices. > > We would like our host DHCP server to be able to determine which of these ip > address is first in the chain and which is second which is third and so on. > > MY question is if we were running a real time os and rtnet do you think it > is possible to ping each of the of the ip address and the measure the > average its time to takes to get a response and to be able to accurate > determine where in the chain each ip address it?
Already a passive switch adds at least a few microseconds latency to the round trip. So, provided to measure a statistically significant number of rounds, you should be able to detect the number of switches and, thus, the position of the node this way. Jan
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