1. A method for identifying conditions affecting a computer network, the network having a mechanism for sending packet bursts along a path in the network and receiving said packet bursts at an end of the path, the method comprising: providing a plurality of example signatures, each of the example signatures corresponding to a network condition; acquiring test data regarding propagation of test packets along the path; creating a test signature from the test data; comparing the test signature to the example signatures; and, identifying at least one of the example signatures which matches the test signature according to a match criterion.