tcpreplay is a BSD-style licensed tool to replay saved tcpdump files at arbitrary speeds. It provides a variety of features for replaying traffic for both passive sniffer devices as well as inline devices such as routers, firewalls, and the new class of inline IDS's. Many NIDSs fare poorly when looking for attacks on heavily-loaded networks. tcpreplay allows you to recreate real network traffic from a real network for use in testing.
f79a12ac01ac965eae195915c3ad0a2b2a7b845ec49b36ec551791787cf8b010tcptrack is a packet sniffer which passively watches for connections on a specified network interface, tracking their states and listing them in a manner similar to the top command. It displays source and destination addresses and ports, connection state, idle time, and bandwidth usage. Screenshot available here.
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