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Source: Security Focus - Posted by Ankit Patel
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IPAudit is a handy tool that will allow you to analyze all packets entering and leaving your network. It listens to a network device in promiscuous mode, just as an IDS sensor would, and provides details on hosts, ports, and protocols. It can be used to monitor bandwidth, connection pairs, detect compromises, discover botnets, and see whos scanning your network. When compared to similar tools, such as Cisco System's Netflow it has many advantages (see the SecurityFocus articles on Netflow, part 1 and part 2). It is easier to setup than Netflow, and if you install it on your existing IDS sensors, there is no extra hardware to purchase. Since it captures traffic from a span port, it does not require that you modify the configuration of your networking equipment, or poke holes in firewalls for Netflow data.
Read this full article at Security Focus
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