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A network packet arrival deadline monitor.
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tcpwatch: A network packet arrival deadline monitor. Tcpwatch lets you specify a tcpdump/bpf filter and a time interval in milliseconds. If a packet matching the filter arrives within the time interval, nothing happens. If it does not arrive within the interval, an outage is signalled to stdout or syslog. Once a packet matches again, the outage is over, a message is signalled to stdout or syslog, and the deadline timer is reset. Usage: tcpwatch -i <iface> [options] Options: -w n Set deadline to n milliseconds. -D Run in foreground. Log to stderr.