Firewall & Port knocking

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Home - OPNsense. Zeroflux.org. Synopsis knockd [options] Description knockd is a port-knock server.

zeroflux.org

It listens to all traffic on an ethernet (or PPP) interface, looking for special "knock" sequences of port-hits. A client makes these port-hits by sending a TCP (or UDP) packet to a port on the server. Download Options -i, --interface <int> Specify an interface to listen on. -d, --daemon Become a daemon. -c, --config <file> Specify an alternate location for the config file. -D, --debug Ouput debugging messages. -l, --lookup Lookup DNS names for log entries. -v, --verbose Output verbose status messages. -V, --version Display the version. -h, --help Syntax help. Configuration knockd reads all knock/event sets from a configuration file. Example #1: This example uses two knocks. Example #2: This example uses a single knock to control access to port 22 (SSH). Example #3: [options] logfile = /var/log/knockd.log [opencloseSMTP] one_time_sequences = /etc/knockd/smtp_sequences seq_timeout = 15 tcpflags = fin,!

Configuration: Global Directives Author. Fwsnort - iptables Intrusion Detection with String Matching and Snort Rules. Fwsnort parses the rules files included in the SNORT ® intrusion detection system and builds an equivalent iptables ruleset for as many rules as possible. fwsnort utilizes the iptables string match module (together with a custom patch that adds a --hex-string option to the iptables user space code which is now integrated with iptables) to detect application level attacks. fwsnort accepts command line arguments to restrict processing to any particular class of snort rules such as "ddos", "backdoor", or "web-attacks".

fwsnort - iptables Intrusion Detection with String Matching and Snort Rules

Processing can even be restricted to a specific snort rule as identified by its "snort id" or "sid". fwsnort makes use of the IPTables::Parse module to translate snort rules for which matching traffic could potentially be passed through the existing iptables ruleset. That is, if iptables is not going to pass, say, HTTP traffic, then fwsnort will not include HTTP signatures within the iptables rule set that it builds. NuFW Project Homepage. Netfilter/iptables project homepage - The netfilter.org project.