The NetSA Security Suite network sensing architecture is comprised of four major subsystems described below: sensor, collector, analysis, and alerting. These subsystems interconnect in order to collect, process, store, and analyze network communications.

Python 2.7 will not be maintained past 2020. Originally, there was no official date. Recently, that date has been updated to January 1, 2020.

MQTT Explorer is a comprehensive MQTT client that provides a structured overview of your MQTT topics and makes working with devices/services on your broker dead-simple.

Please note, changing your handset’s IMEI number may void warranty or break the law. As far as I know, it’s strictly prohibited to change any phone’s IMEI number in the UK. So always refer to your user manual and local law, you are responsible for any action you take.

urlscan.io is a service to scan and analyse websites. When a URL is submitted to urlscan.io, an automated process will browse to the URL like a regular user and record the activity that this page navigation creates. This includes the domains and IPs contacted, the resources (JavaScript, CSS, etc) requested from those domains, as well as additional information about the page itself. urlscan.io will take a screenshot of the page, record the DOM content, JavaScript global variables, cookies created by the page, and a myriad of other observations.

Finally, urlscan.io will try to make a verdict whether the scanned website is considered malicious or suspicious. If the site is targeting the users one of the almost 400 brands tracked by urlscan.io, this will be shown in the scan results.

The Network Situational Awareness (NetSA) group at CERT has developed and maintains a suite of open source tools for monitoring large-scale networks using flow data. These tools have grown out of the work of the AirCERT project, the SiLK project and the effort to integrate this work into a unified, standards-compliant flow collection and analysis platform.

If you are new to the NetSA Security Suite, start with this overview of the components that comprise the NetSA Security Suite and their inter-operation.

CERT is a part of the Software Engineering Institute (SEI), a federally funded research and development center (FFRDC) operated by Carnegie Mellon University.

Syslog Watcher installs a dedicated syslog server, integrating log data from multiple network devices into a single, easily manageable and accessible place. Collecting and analyzing syslogs is essential for maintaining network stability and auditing network security.

This is a nice question.

As a matter of fact, tcpdump is the first software found after the wire (and the NIC, if you will) on the way IN, and the last one on the way OUT.

Wire -> NIC -> tcpdump -> netfilter/iptables

iptables -> tcpdump -> NIC -> Wire
Thus it sees all packets reaching your interface, and all packets leaving your interface. Since packets to port 53 do not get a reply, as seen by tcpdump, you have successfully verified that your iptables rules have been correctly configured.

EDIT

Perhaps I should add a few details. tcpdump is based on libpcap, a library which creates a packet socket. When a regular packet is received in the network stack, the kernel first checks to see whether there is a packet socket interested in the newly arrived packet and, if there is one, it forwards the packet to that packet socket. If the option ETH_P_ALL is chosen, then all protocols go thru the packet socket.

libpcap implements one such packet socket with the option activated, keeps a copy for its own use, and duplicates the packet back onto the network stack, where it is processed by the kernel in the usual way, including passing it first to netfilter, the kernel-space counterpart of iptables. Same thing, in reverse order (i.e., first netfilter then last the passage thru the packet socket), on the way out.

Is this prone to hacking? But of course. There are certainly proof-of-concept rootkits using libpcap to intercept communications destined to the rootkit before the firewall can lay its hand on them. But even this pales in comparison with the fact that a simple Google query unearths working code hiding traffic even from libpcap. Still, most professionals think the advantages vastly outweigh the disadvantages, in debugging network packet filters.

The Core Project, as suggested by our name, is not a turnkey desktop distribution. Instead we deliver just the core Linux from which it is quite easy to add what you want. We offer 3 different x86 "cores" to get you started: Core, TinyCore, and our installation image, CorePlus.

If the other solutions listed above won't work, then try the Emergency Password Reset Script. It is not a Plugin. It is a PHP script.