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There are two different types of packet loss, first there is inbound packet loss, this is incoming traffic that coming from another network to your router / modem. Then there is outbound packet loss, which goes from your router to another source.
Some of the best tools for testing outbound packet loss is via the command prompt, this command would be called pathping.
To initiate this command first click start, run, cmd and when the command prompt opens type pathping rr.com
Pathping is a TCP/IP based utility (command-line tool) that provides useful information about network latency and network loss at intermediate hops between a source address and a destination address. It does this by sending echo requests via ICMP and analyzing the results. ICMP stands for Internet Control Message Protocol. ICMP is an extension to the Internet Protocol (IP - part of the TCP/IP protocol suite) defined by RFC 792. You can use a tool like PathPing to see not only if your packets are making it across the network, but are taking the correct preferred path, or flowing over the alternate link, which would indicate a misconfiguration or a downed node. PathPing will also let you see if you have any bottlenecks on the network and if you have any latency issues.
If the milliseconds rate were at a very high number, such as 500ms, then you might consider having a bandwidth issue. PathPing doesnt only verify connectivity to a destination host, but also, it shows you how your traffic is getting there, and how fast its going, how much resistance its encountering over the wide area network which is a very common choke point.
For more information about PathPing or How to use Pathping Reference: »www.windowsnetworking.com/articl···ing.html
RFC 792: »www.faqs.org/rfcs/rfc792.htm
How to test Inbound Packetloss
You can remotely login to another host and test pathping to your router. Or you can use such tools that are provided here on DSLReports, such as the Line Monitoring tool.