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EHNT 0.4

  Date Added: February 07, 2010  |  Visits: 908

EHNT

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EHNT is a tool which turns streams of Netflow (version 5) data into something useful and human-readable. (Netflow is a UDP-based traffic reporting protocol created by Cisco, generated by Cisco, Juniper, Foundry, and other routers.) Netflow operates in many ways. It will dump flow records in human-readable form. It will also provide reports on top ASes, IP protocols, and tcp/udp ports. The reports can be generated over various intervals, from 1 minute to 1 day. Component programs are: 1. ehntserv listens to netflow version 5 UDP packets, and also listens for client TCP connections. When a TCP client connects, the server starts forwarding all the netflow packets it receives (plus the IP address of the originating device) to that client. ehntserv does not currently do any IP access control. I suggest that you use ipchains or iptables on your linux box, or IP Filter (ipf) (http://coombs.anu.edu.au/ipfilter/) on your Solaris or BSD box. I dont know what the current state of packet filtering is on other Unixes; IP Filter seems to support several. 2. ehnt connects to ehntserv and displays the flows it receives in various ways. It currently has four modes (-m ): - top mode displays average utilization by top ASes, IP protocols, or tcp/udp ports over a given interval (from 1 minute to 1 day). Top mode is different when it focuses on a single interface on a single router, because then you get to see summaries of source and destionation for both inbound and outbound traffic. Otherwise, you just get summaries of source and destination. - dump mode displays individual flows - shortdump mode display individual flows in a more compact but hard to read fashion - colondump mode display individual flows in a machine-readable format. And yes, I recognize that the name of this mode is unpleasant. In all three modes, simple (REALLY simple) filtering can be done for AS number, TCP/UDP port, IP protocol number, device sending the flow record, and SNMP interface index. You may think of ehnt in the three dump modes as a brain-dead and incredibly simple tcpdump for netflow. ehnt also has the silly and uninspiredly-named big filter, in which it only displays flows with are bigger (in packets or bytes) than any flow received before it. This only makes sense in the three dump modes. Whats New in This Release: - Added Unix domain support for client connections, enabled by default.

Requirements: No special requirements
Platforms: Linux
Keyword: Ehnt Flows Ip Mode Netflow Networking Streams System Tcp Udp
Users rating: 0/10

License: Freeware Size: 2.3 MB
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