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https://developer.mozilla.org/en-US/docs/Tools/Network_Monitor

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PRTG Network Monitor runs on a Windows machine within your network, collecting various statistics from the machines, software, and devices which you designate. (It can also autodiscover them, helping you map out your network.) It also retains the data so you can see historical performance, helping you react to changes.

PRTG Network Monitor includes more than 200 sensor types for all common network services, including HTTP, SMTP/POP3 (email), FTP, etc

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Microsoft Network Monitor is a deprecated packet analyzer. It enables capturing, viewing, and analyzing network data and deciphering network protocols. It can be used to troubleshoot network problems and applications on the network.

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Microsoft Network Monitor is a deprecated packet analyzer. It enables capturing, viewing, and analyzing network data and deciphering network protocols. It can be used to troubleshoot network problems and applications on the network.

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Deep inspection of hundreds of protocols, with more being added all the time

Live capture and offline analysis

Standard three-pane packet browser

Multi-platform: Runs on Windows, Linux, macOS, Solaris, FreeBSD, NetBSD, and many others

Captured network data can be browsed via a GUI, or via the TTY-mode TShark utility

The most powerful display filters in the industry

Rich VoIP analysis

Read/write many different capture file formats: tcpdump (libpcap), Pcap NG, Catapult DCT2000, Cisco Secure IDS iplog, Microsoft Network Monitor, Network General Sniffer® (compressed and uncompressed), Sniffer® Pro, and NetXray®, Network Instruments Observer, NetScreen snoop, Novell LANalyzer, RADCOM WAN/LAN Analyzer, Shomiti/Finisar Surveyor, Tektronix K12xx, Visual Networks Visual UpTime, WildPackets EtherPeek/TokenPeek/AiroPeek, and many others

Capture files compressed with gzip can be decompressed on the fly

Live data can be read from Ethernet, IEEE 802.11, PPP/HDLC, ATM, Bluetooth, USB, Token Ring, Frame Relay, FDDI, and others (depending on your platform)

Decryption support for many protocols, including IPsec, ISAKMP, Kerberos, SNMPv3, SSL/TLS, WEP, and WPA/WPA2

Coloring rules can be applied to the packet list for quick, intuitive analysis

Output can be exported to XML, PostScript®, CSV, or plain text

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Wireshark is one of the best tools as it is supported by all of the various operating systems, allows you to refine protocols and find data in certain packets. For example, you can search for cookies containing certain text by applying filters and cookie.contains="text". There is also a command line version available.

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http://www.gfi.com/blog/the-top-20-free-network-monitoring-and-analysis-tools-for-sys-admins/

·      Microsoft Network Monitor

·      Nagios

·      Capsa Free

·      Networkminer

·      Total Network Monitor

·      Netxms

·      Wireshark ��W��S�

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Tools that are used to monitor networks:

Wireshark

-Available for all operating systems

-Easy to learn and use

-Easily visible analysis of traffic

-Able to arrange network traffic

-Free

PRTG

-PRTG is what this stands for

-Paid program

-Commonly used on larger networks

-Allows monitoring of the network

Microsoft Network Monitor

-Has been replaced by Microsoft Message Analyser

-Packer Analyser

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https://www.wireshark.org/

"Wireshark is the world's foremost network protocol analyzer. It lets you see what's happening on your network at a microscopic level. It is the de facto (and often de jure) standard across many industries and educational institutions."

Deep inspection of hundreds of protocols, with more being added all the time

Live capture and offline analysis

Standard three-pane packet browser

Multi-platform: Runs on Windows, Linux, macOS, Solaris, FreeBSD, NetBSD, and many others

Captured network data can be browsed via a GUI, or via the TTY-mode TShark utility

The most powerful display filters in the industry

Rich VoIP analysis

Read/write many different capture file formats: tcpdump (libpcap), Pcap NG, Catapult DCT2000, Cisco Secure IDS iplog, Microsoft Network Monitor, Network General Sniffer® (compressed and uncompressed), Sniffer® Pro, and NetXray®, Network Instruments Observer, NetScreen snoop, Novell LANalyzer, RADCOM WAN/LAN Analyzer, Shomiti/Finisar Surveyor, Tektronix K12xx, Visual Networks Visual UpTime, WildPackets EtherPeek/TokenPeek/AiroPeek, and many others

Capture files compressed with gzip can be decompressed on the fly

Live data can be read from Ethernet, IEEE 802.11, PPP/HDLC, ATM, Bluetooth, USB, Token Ring, Frame Relay, FDDI, and others (depending on your platform)

Decryption support for many protocols, including IPsec, ISAKMP, Kerberos, SNMPv3, SSL/TLS, WEP, and WPA/WPA2

Coloring rules can be applied to the packet list for quick, intuitive analysis

Output can be exported to XML, PostScript®, CSV, or plain text