Essential Tools for Network Monitoring: Scanners, Analyzers, and More!
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🎶 Torch scanners 🔦 are 🔍 used to scan a network 🌐 for open ports and protocols 📡🔌. The information 📝 that a port scanner gathers is Vital Information 💪 if you want to harden the network. 🛡️ Port scanners are a great method of finding vulnerabilities 🔍 in the network infrastructure, allowing the network administrator to plug 🔌 those vulnerabilities before they become a security breach 🔒. I do have to issue a word of caution ⚠️, you should only use a port scanner on a network or system that you are authorized to scan ✅. Port scanning is a possible sign of someone trying to breach a system 🕵️♀️ and can lead to problems if you’re not authorized to scan that system. You don’t want to have to try and explain to an information security specialist 🤦♂️ why you were scanning their network if you’re not authorized to scan it. A little bit different than a port scanner are applications that use interface monitoring or packet flow monitoring 🌊. These are usually deployed as an active software tool 🛠️ to Monitor and analyze Network traffic 🚦 within a network segment. They’re commonly called packet sniffers 👃 or protocol analyzers 🕵️♀️. They allow for an in-depth look 👀 at what traffic is on the network and may reveal security issues 🔍 that the network administrator can then mitigate 🛡️. They help to identify top talkers 🗣️ on a network segment, top talkers are those nodes 🧑💻 or applications 📱 that generate the most amount of traffic. Packet sniffers can help to identify top listeners 🔊 on a network segment, a top listener is that interface or the interfaces that are receiving the most Network traffic 🌊 or put another way those interfaces that are utilizing the most bandwidth for receiving packets 📦. This can help an administrator when they have determined that load balancing might be needed on the network. 📈 Microsoft message analyzer and Wireshark are examples of free packet flow monitoring tools. 💻
Now let’s move on to wireless monitoring tools 📶 and we’re going to begin with the Wi-Fi analyzer 📡. A Wi-Fi analyzer is a similar tool to a protocol analyzer but only for wireless networks 📶. It sniffs out packets on wireless networks and gives you statistics 📊 on those packets that it sees 👀. It can check for bandwidth usage, channel usage, top talkers 🗣️, top listeners 🔊, etc. just like a packet sniffer can. Wi-Fi analyzers can also identify networks 📶 by passively scanning the radio frequencies to determine where traffic is coming from. Given enough time, a Wi-Fi analyzer can also identify hidden networks 🕵️♂️ or those that you don’t know about. A Wi-Fi analyzer can also infer non-beaconing networks based on data traffic over the radio frequencies. They may not be able to discover the SSID but they can tell the network administrator that something is passing traffic there 🚦. Another type of wireless monitoring tool 📡 are wireless survey tools 🗺️. They’re most commonly used as a design tool 🛠️ for setting up high quality wireless networks 📶. When used in conjunction with mapping tools 🗺️, the survey tools can help to establish the required amount of access points to get the proper amount of coverage 🌍, the ideal antenna placement 📡, and the optimum amount of channel overlap 📡. Wireless survey tools can also help to identify possible sources of radial frequency interference
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