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Your WAN provider should be able to tell you the amount of bandwidth you're supposed to have. If you're looking to verify their numbers, I've found a simple test is to use a simple traffic generator to send traffic through the WAN link above the "official" bandwidth capacity and measure on the other side whether you receive the "official" amount of bandwidth. Do know this testing can be adverse to other traffic unless you have QoS that allows the test traffic to only use otherwise unused bandwidth. Also, it you test when "normal" traffic is at a usual ebb, you may not need to account for its traffic volume. I.e. such testing is best conducted during off-hours and ideally during a maintenance window.
