If you knew all the varibles, in theory I believe you could calculate expected packet drop, but I've never seen it done in practice. The number of variables to consider is quite extensive.
For TCP, you can precompute the BDP (bandwidth delay product). Having this value provides for optimal TCP transmission rate, but won't provide information about what drops you might see in actual practice. Again, many other variables.
For actual traffic, like with routers, you could record the packets sent/received at the end hosts. However, even if they match, the sending TCP host could have thought there were drops when there were not. So you need to also look at TCP retransmissions.
Between two routers, the one place you're likely to see drops, is on the interface's drop counter. You can compare that value to the counter for output packets, also on the interface.
Another place for drops, when using WAN "cloud" technolgies, are drops within the WAN cloud. Assuming you have counters that register packets sent (on the outgoing router) and counters that register packets received (on the receiving router), the difference will be drops within the WAN cloud. (NB: do keep in mind you need to compare counters for the same time period.)
For presentation of drops, they're often presented as a drop percentage during some time periods; i.e. packet drops divided by packets sent multiplied by 100.
The impact of drops varies per traffic type. For instance, TCP usually continues to perform fairly well up to about a 1% drop rate. Much above that, TCP will usually continue to transfer packets, but possibly at a highly reduced transmission rate, and possibly with loss of usable bandwidth due to retransmissions.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.