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ngrep strives to provide most of GNU grep's common features,applying them to the network layer. ngrep is a pcap-aware tool that will allow you to specify extended regularexpressions to match against data payloads of packets.
SUPPORT/REPORTING BUGS: please use https://github.com/jpr5/ngrep/issues Thank you!
The fetchlog utility displays the last new messages of a logfile (syslog). fetchlog is similar like tail but offers some extra functionality like pattern matching with regularexpressions, output formatting for email, SMS, pager or SNMP tools, etc.
HLBR is an IPS (Intrusion Prevention System) that can filter packets in the OSI layer 2. Detection of malicious traffic is done by rules. It can even be used as bridge to honeypots. The HLBR is a firewall element and can use regularexpressions.
Warning: this project was discontinued and should not be used in production networks. There are several bugs.
SquidTL is a software created for administrators that want to limit usage of particular web sites by public internet points or office intranets. You can define rules based on regularexpressions and time periods.
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Logdigest mails interesting lines from log files to the system administrator. Non-relevant lines are filtered out by customizable regularexpressions. Logdigest comes with a set of such regexps to provide a good starting point.
Syslog Collector listen for syslog messages and parse them following some regularexpressions. It then increment some counters which are exposed through SNMP Agent-X interface