Tingle-a suite for monitoring networks

The Tingle suite consists of three programs that monitor remote hosts on a network, perform user-specified actions in response to changing network conditions, and generate reports related to network performance. The first program, Tingle, sends echo requests to user-specified hosts. Echo replies are captured and used to generate one-line reports regarding the state of the remote hosts. The other two programs of the suite process the output of Tingle. The first, twarn, performs user-specified actions in response to network transitions, such as hosts going up or down. The second, tsum, generates summaries of measurements of network performance, such as echo response time and the ratio of echo replies to echo requests