- Portsmonitor 1 3 3 – Monitor System Tcpip Network Connections Windows 10
- Portsmonitor 1 3 3 – Monitor System Tcpip Network Connections Diagram
The most useful command for examining TCP/IPperformance (and that of other protocol stacks) isnetstat(TC).This command displays the contents of various networking-relateddata structures held in the kernel.We have already encountered the -m option tonetstat in``Monitoring STREAMS performance'where it allowed us to see how STREAMSresources were allocated inside the kernel.
The command netstat -i displays the status of the system'snetwork interfaces. (To view only a single interface, specify thisusing the -I option.) The output from this command has thefollowing form:The important fields are
Ierrs
, Oerrs
,and Collis
.In PRTG, “Sensors” are the basic monitoring elements. One sensor usually monitors one measured value in your network, e.g. The traffic of a switch port, the CPU load of a server, the free space of a disk drive. On average you need about 5-10 sensors per device or one sensor per switch port. View video (3:26 min.). It sends TCP data packets to a server, which should send back 1 response to the client in the same TCP connection. If it does not send any response, or sends more than 1 response, then I have a bug in the server code. What I want to do is to monitor the TCP port for response message(s) and print them out. 10 examples of Linux ss command to monitor network connections; 10 examples of Linux ss command to monitor network connections. By Silver Moon July 15, 2020. My experience is that on a RHEL 6 system, netstat -anp takes 0.161 seconds to run, while ss -np takes 6.7 seconds. If by faster you really mean 416 times slower, then I agree. PortsMonitor 1.4.1 - is a system utility for monitoring system TCP/IP network connections by application, and connections' status. With search-expression.
Ierrs
is the number of received packets that the system recognizedas being corrupted. This usually indicates faulty network hardware suchas a bad connector, incorrect termination (on Ethernet), but it may alsobe caused by packets being received for an unrecognized protocol.For network adapters with small buffers, it may meanthat they have been saturated by end-to-end streams of packets. In thiscase, you should switch the network interface to one-packet mode usingtheifconfig(ADMN)command as described in``Using ifconfig to change parameters for a network card'.Oerrs
is the number of errors that occurred while the systemwas trying to transmit a packet.This generally indicates a connection problem.On Ethernet, it may also indicate a prolonged period of timeduring which the network is unusable due to packet collisions.Collis
is the number of times that the system(connected to a network using Ethernet as its physical medium)detected another starting to transmit while it was already transmitting.Such an event is called a packet collision.The ratio of the number ofcollisions to the number of output packets transmitted gives a indicationof the loading of the network. If the number of Collis
is greater than 10% of pkts
for themost heavily used systems on the network, you should investigatepartitioning the network as described in``Configuring network topology for performance'.Networks implemented usingToken Ring and FDDI technology use adifferent protocol to communicate at the physicallayer and do not experience packet collisions.The value in the
Collis
field should bezero for such networks.See``Troubleshooting TCP/IP'for a full discussion of these issues.
NOTE:You can also use thendstat(ADM)command to obtain similar information to thatdisplayed by netstat -i.The following table summarizes the commands that you can use toexamine the performance of TCP/IP:
Examining TCP/IP performance Akvis magnifier 9 5.
Command | Field | Description |
---|---|---|
netstat -i | Ipkts | number of network packets received |
Ierrs | number of corrupted network packets received | |
Opkts | number of network packets transmitted | |
Oerrs | number of errors while transmitting packets | |
Collis | number of packet collisions detected |
Configuring TCP/IP daemons for performance
If TCP/IP is configured, your system runs the/etc/rc2.d/S85tcp script each time it goes to multiuser mode.(Note that this file is a link to /etc/tcp.)This script starts several TCP/IP daemons.If configured to run, the following daemons may affect performance:
named
rwhod
snmpd
Tuning SLIP performance
Leech 2 2 1 – complete control over your downloads. To maximize performance of a connection over a SLIP link,do the following:
- Select Van Jacobson (VJ) TCP/IP headercompression using the +c option toslattach(ADMN)if the incoming connection expects this to be set or it canautomatically detect compressed packets.
- Select automatic detection of TCP/IP header compressionusing the +e option to slattachif the incoming connection uses compressed packets.NOTE:If both ends of a connection use automatic detection, headercompression will not be used. At least one end must explicitlychoose to use compression using the +c option.
- Use the -mmtu option toslattach to set the maximumtransmission unit for the link. The default value is 296 bytes-- 40 bytes for the header plus 256 bytes of data. Increasethis value if you are not using the link as an interactiveconnection. For example, if you are transferring data, you mightset this to 1064. The minimum possible value is 42 bytes.The maximum suggested value is 1536 bytes.
Tuning PPP performance
To maximize performance of a connection over a PPP link,do the following:
- Enable hardware flow control on the modem being used. It must beconnected to a modem control port such as/dev/tty1A or /dev/tty2A.
- Use the Network Configuration Manager (see``Configuring network connections')to turn on Van Jacobson (VJ) TCP/IP headercompression, enable the maximum number (16) of VJcompression slots, and enable compression of these slots.See``Configuring the Point-to-Point Protocol (PPP)'for more information about othercompression features that you can enable.
- Set the maximum receive unit (MRU) to 296 forinteractive inbound or outbound connections. Set this higher, to1064 for example, if the link is only being used to transfer data.The maximum suggested value is 1536 bytes.
For a complete discussion of using PPP, see``Configuring the Point-to-Point Protocol (PPP)'.
Testing network connectivity
Theping(ADMN)command is useful for seeing if a destination machine isreachable across a local area network (LAN) or awide area network (WAN). If you are root, youcan use the flood option, -f, on a LAN.This sends a hundred or more packets per second andprovides a stress test of the network connection.For every packet sent and received, pingprints a period (.) and a backspace respectively. If you seeseveral periods being printed, the network is dropping packets.
If you want to find out how packets are reaching a destinationand how long this takes, use thetraceroute(ADMN)command. This provides information about the number of hopsneeded, the address of each intermediate gateway, and themaximum, minimum and average round trip times in milliseconds.On many hop connections, you may need to increase the maximumtime-to-live (TTL) and wait times for the probe packetsthat traceroute sends out. To do this, use the-m and -w options.
See also:
Configuring network topology for performance
The types and capabilities of Ethernet network technology (asdefined by the IEEE 802.3 standard) areshown in the following table:
Ethernet network technologies
Type | Topology and | Maximum segment | Maximum number |
---|---|---|---|
and alternative names | medium | length | of nodes per segment |
10Base5, ThickNet | linear, 50 ohm 10mm coaxial cable terminated at both ends | 500m | 100 |
10Base2, ThinNet, CheaperNet | linear, 50 ohm 5mm coaxial cable terminated at both ends | 185m | 30 |
10Base-T, twisted pair | star, unshielded twisted pair | 100m | 2 |
To attach nodes to the network,10Base5 connects drop cables to vampire tapsdirectly attached to the coaxial cable or totransceiver boxes placed in line with the cable.
10Base2 T-piece connectors must be connecteddirectly to the coaxial terminal of the network card-- that is, you cannot use a coaxial cable as a drop cable.
If you want to extend the length of an Ethernet cablesegment, there are three ways of doing this:
- Repeaters retransmit network packets (including any electricalnoise) and connect network segments at the physical layer. Theydo not separate network traffic but they can be used forconnecting different network media, for example, to connect10Base2 and 10Base5.
- Bridges also connect network segments at the physical layer butthey can be used to filter selected traffic between network segments.
- Routers connect networks that use the same networkingprotocols. For TCP/IP, the connection is made at thelevel of the IP layer. Routers can control whetherpackets are forwarded between network segments.
Monitor the network regularly for packet collisions as described in``Monitoring TCP/IP performance'or use a network activity tester (commonly called a sniffer)if you have access to one.If the proportion of collisions to packets sent is greater than 10%,your network is probably overloaded.Some networks may be able to struggle along at collision ratesas high as 30% but this is rarely acceptable.
If there are a large number of inputor output errors, suspect the network hardware of causing problems.Reflected signals can be caused by cable defects, incorrecttermination, or bad connections. A network cable analyzer can beused to isolate cable faults and detect any electricalinterference.
Dividing a network into subnetworks to reduce network traffic
To reduce network loading, considerdividing it into separate networks (subnets) as shown in``Dividing a network into subnetworks to reduce network traffic'.This diagram shows how a network could be divided into threeseparate subnets. Routers connect each subnet to a backbonenetwork. This solution only makes sense if you can groupclients with individual servers by the function they perform.For example, you could arrange that each subnet correspondsto an existing department or project team within an organization.The clients dependent on each server should live onthe same subnet for there to be a gain in network performance.If many machines are clients of more than oneserver, this layout may actuallymake the situation worse as it will impose an additional loadon the servers acting as routers.
Portsmonitor 1 3 3 – Monitor System Tcpip Network Connections Windows 10
An alternative would be to use bridges to connect thenetwork segments though this may be a more expensivesolution. A potential problem with this is that if a bridge fails,the connection between the two segments is severed.
By connecting subnets using more than one router,you can provide an alternative route in case of failure of oneof the routers. Another problem with using bridges is that theyare intended to partially isolate network segments -- theyare not a solution if you want to provide open access to allavailable services.
Design the layout of subnets to reflect network usage.Typically, each subnet will contain at least one server ofone or more of the following types:
- File server providing access to networked filesystems.
- Database server providing access to a database.
- Compute server providing intensive numeric calculations.
- Page server providingswap spacefor diskless clients.
- Bootstrap server enablingX terminalsand diskless clients to boot over the network.
- Host server for X terminals.
- Master or slave Network Information Services (NIS)servers for clients or copy-only servers.
If you run client-server applications across repeaters, bridges,or routers, you should be aware that this will impose additionaldelay in the connection. This delay is usually least forrepeaters, and greatest for routers.
See also:
- ``Administering TCP/IP'
- ``Creating subnets'
Configuring routing for performance
There are few performance issues concerned with routing.Choice of routes outside your system is not generally in your controlso this discussion only considers routing within an autonomous network.
Most networks use the Routing Information Protocol (RIP)for internal routing.RIP uses a metric for choosing a routebased on distance as a number of hops.This metric is not optimal in certaincircumstances. For example, it would choose a path to thedesired destination over a slow serial link in preferenceto crossing an Ethernet and a Token Ring. You can increase the hopcount on the slow interface advertised in the /etc/gatewaysfile to overcome this limitation.The RIP protocol is available with both therouted(ADMN)andgated(ADMN)routing daemons.
Most networks tend to use routed as it requires noconfiguration. However, we recommend that you only useRIP for simple network topologies.The Open Shortest Path First (OSPF) protocolis better suited than RIP for complex networks withmany routers because it has a more sophisticated routing metric.It can also group networks into areas.The routing information passed between areas uses an abstractedform of internal routing information to reduce routing traffic.OSPF is only available using the gatedrouting daemon.
You can use the Internet Router Discovery(IRD) protocol for routing withinnetworks in autonomous systems.This is not a true routing protocol but it allows hosts connected to a multicast or broadcast network todiscover the IP addresses of routers usingICMP messages. Routers can also use the protocolto make themselves known. Theirdd(ADMN)daemon uses the IRD protocol and is normally configuredto run by default in addition to routed.
You can minimize the routing traffic on your network by configuring:
- Non-routing hosts to use only the IRD protocol.
- Interior routers to use IRD, and eitherRIP or OSPF.
- Exterior routers of an autonomous system to use an exteriorrouting protocol such as BGP or EGP.
Configuring DNS name service for performance
The Domain Name Service server included with TCP/IP canoperate in a numberof modes, each of which has its own performance implications.
A primary or secondary DNS nameserver maintains andaccesses potentially large databases, answers requests from otherservers and clients, and performs zone transfers. Both networktraffic and memory are impacted.
There are several ways in which you can influence the performanceof primary and secondary DNS nameservers:
- Choose appropriate machines to serve as primary andsecondary nameservers.Such machines should be stable, have a large amountof memory, and a low system load.
- Choose the appropriate number of secondary (redundant)nameservers to ensure against failure.Be careful, however, that you do not overload the network byhaving too many secondary servers, or any one machine by havingtoo few.
- Configure time-to-live (ttl) values in the standard resourcerecords (RRs) of the zone file so that cached data does notexpire too quickly necessitating further data transfer.
- Schedule zone file transfers for network slack times if your zonecontains many secondary servers.You can do this by changing the version number (serial)of the zone file on the master server.Kill named with SIGHUP (for example, usingthe command kill -s HUP $(cat /etc/named.pid)if you use the Korn shell)to make it re-read the named.boot file.Then kill named with SIGHUPon each secondary server to makeit request a full zone transfer.Note that you would normally use the refreshfields of the Start of Authority (SOA)record to control the frequency of zone refreshes.
A caching-only DNS nameserver maintains andaccesses a potentially large cache.Because a caching-onlyserver may answer many of its own requests, memory is impactedmore highly than network traffic.If the machine has limited memory, youshould strongly consider turning the machine into a DNSclient using the resolver configuration file,/etc/resolv.conf.
A DNS client pushes all resolution requests onto oneor more DNS servers on the network; none are handledlocally.This puts the burden of resolutionon the network and on the nameservers listed in resolv.conf.It also means that nameddoes not run and, therefore, does not add to the system load.In the case where the local machine has limited memory andresponse timeover the network ranges from adequate to excellent, thisconfiguration is desirable from a performance standpoint.If network response time is slow and memory is not limited,consider re-configuring the system as a caching-only server.
See also:
Next topic: NFS resources
Previous topic: Tuning TCP/IP performance
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003
Here are 20 of the best free tools for monitoring devices, services, ports or protocols and analyzing traffic on your network. This list is intended to supplement 101 Free SysAdmin Tools. Even if you may have heard of some of these tools before, I’m confident that you’ll find a gem or two amongst this list.
1. GFI LanGuard (our award-winning paid solution)
People say it’s good to be modest and not to brag, but we’re so proud of our network management tool that we had to start the list with GFI LanGuard. You can use it to scan both small and large networks, in search of software vulnerabilities and unpatched or unlicensed applications. Information coming from up to 60,000 devices, running on Windows, Mac OS or Linux, will be shown in a centralized web console, so you’ll be able to see the state of your whole network at any moment and from any location.
With centralized patch management and network auditing, GFI LanGuard prevents potential compliance issues, but if you’re a sysadmin the fact that all machines are patched and secured will surely seem like a more important advantage. But, don’t take our word for it, download the free 30-day trial and try it out.
2. Microsoft Message Analyzer
Microsoft Message Analyzer, the successor to Microsoft Network Monitor 3.4, has an intuitive and flexible UI with effective filtering options that allow you to break down and drill into captured packets (or ‘messages’ as they are called in Message Analyzer). By adding ‘Color Rules’ to different protocol traffic, you can make scanning through areas of interest easier and faster.
Some of its highlighted features include automated data capture (using PowerShell cmdlets to start or stop traces based on a particular trigger), TLS/SSL decryption support and customizable filter expressions.
Microsoft Message Analyzer allows you to assess multiple log data sources from a single pane of glass. You can capture, view and analyze network protocol traffic side-by-side with other system or application events (e.g., Event Logs or SQL Tables), making it a valuable addition to your network toolkit.
When you launch Microsoft Message Analyzer, click ‘Start Local Trace’ to immediately start capturing traffic from the local machine, or ‘New Session’ to add a Data Source to capture.
3. Nagios
Nagios is a powerful network monitoring tool that helps you to ensure that your critical systems, applications, and services are always up and running. It provides features such as alerting, event handling, and reporting. Nagios Core is the heart of the application that contains the core monitoring engine and a basic web UI. On top of Nagios Core, you can implement plugins that will allow you to monitor services, applications, and metrics, a chosen frontend as well as add-ons for data visualization, graphs, load distribution, and MySQL database support, amongst others.
Once you’ve installed and configured Nagios, launch the Web UI and begin to configure host groups and service groups. Once Nagios has had some time to monitor the status of the specified hosts and services, it can start to paint a picture of what the health of your systems look like.
4. OpenNMS
OpenNMS is an open source enterprise-grade network management application that offers automated discovery, event and notification management, performance measurement, and service assurance features. OpenNMS includes a client app for the iPhone, iPad or iPod Touch for on-the-go access, giving you the ability to view outages, nodes, alarms and add an interface to monitor.
Once you successfully login to the OpenNMS web UI, use the dashboard to get a quick ‘snapshot view’ of any outages, alarms or notifications. You can drill down and get more information about any of these sections from the Status drop-down menu. The Reports section allows you to generate reports to send by e-mail or download as a PDF.
5. Advanced IP Scanner
Advanced IP Scanner is a fast and easy to use network scanner that detects any network devices (including wireless devices such as mobile phones, printers, and WIFI routers) on your network. It allows you to connect to common services such as HTTP, FTP and shared folders if they are enabled on the remote machine. You are also able to wake up and shut down remote computers.
The installer allows you to fully install the application on your machine or run the portable version. When you launch Advanced IP Scanner, start by going to Settings > Options to select which resources to scan and how fast/accurate you want the results. You can then choose which subnet to scan and proceed with pressing the “Scan” button. Once the scan is complete, expand the results to see which resources you can connect to for each discovered device or export your results to XML/HTML/CSV.
6. Capsa Free
Capsa Free is a network analyzer that allows you to monitor network traffic, troubleshoot network issues and analyze packets. Features include support for over 300 network protocols (including the ability to create and customize protocols), MSN and Yahoo Messenger filters, email monitor and auto-save, and customizable reports and dashboards.
When you launch Capsa, choose the adapter you want it to bind to and click “Start” to initiate the capture process. Use the tabs in the main window to view the dashboard, a summary of the traffic statistics, the TCP/UDP conversations, as well as packet analysis.
7. Telerik Fiddler
Fiddler is a web debugging tool that captures HTTP traffic between chosen computers and the Internet. It allows you to analyze incoming and outgoing data to monitor and modify requests and responses before they hit the browser. Fiddler gives you extremely detailed information about HTTP traffic and can be used for testing the performance of your websites or security testing of your web applications (e.g., Fiddler can decrypt HTTPS traffic).
When you launch Fiddler, HTTP traffic will start to be captured automatically. To toggle traffic capturing, hit F12. You can choose which processes you wish to capture HTTP traffic for by clicking on “All Processes” in the bottom status bar, or by dragging the “Any Process” icon from the top menu bar onto an open application.
8. NetworkMiner
NetworkMiner captures network packets and then parses the data to extract files and images, helping you to reconstruct events that a user has taken on the network – it can also do this by parsing a pre-captured PCAP file. You can enter keywords which will be highlighted as network packets are being captured. NetworkMiner is classed as a Network Forensic Analysis Tool (NFAT) that can obtain information such as hostname, operating system and open ports from hosts.
In the example above, I set NetworkMiner to capture packets, opened a web browser and searched for “soccer” as a keyword on Google Images. The images displayed in the Images tab are what I saw during my browser session.
When you load NetworkMiner, choose a network adapter to bind to and hit the “Start” button to initiate the packet capture process.
9. Pandora FMS
Pandora FMS is a performance monitoring, network monitoring, and availability management tool that keeps an eye on servers, applications and communications. It has an advanced event correlation system that allows you to create alerts based on events from different sources and notify administrators before an issue escalates.
Portsmonitor 1 3 3 – Monitor System Tcpip Network Connections Diagram
When you login to the Pandora FMS Web UI, start by going to the ‘Agent detail’ and ‘Services’ node from the left-hand navigation pane. From here, you can configure monitoring agents and services.
10. Zenoss Core
Zenoss Core is a powerful open source IT monitoring platform that monitors applications, servers, storage, networking, and virtualization to provide availability and performance statistics. It also has a high-performance event handling system and an advanced notification system.
Once you login to Zenoss Core Web UI for the first time, you are presented with a two-step wizard that asks you to create user accounts and add your first few devices/hosts to monitor. You are then taken directly to the Dashboard tab. Use the Dashboard, Events, Infrastructure, Reports and Advanced tabs to configure Zenoss Core and review reports and events that need attention.
11. PRTG Network Monitor Freeware
PRTG Network Monitor monitors network availability and network usage using a variety of protocols including SNMP, Netflow, and WMI. It is a powerful tool that offers an easy to use web-based interface and apps for iOS and Android. Amongst others, PRTG Network Monitor’s key features include:
(1) Comprehensive Network Monitoring which offers more than 170 sensor types for application monitoring, virtual server monitoring, SLA monitoring, QoS monitoring
(2) Flexible Alerting, including nine different notification methods, status alerts, limit alerts, threshold alerts, conditional alerts, and alert scheduling
(3) In-Depth Reporting, including the ability to create reports in HTML/PDF format, scheduled reports, as well as pre-defined reports (e.g., Top 100 Ping Times) and report templates.
Note: The Freeware version of PRTG Network Monitor is limited to 100 sensors.
When you launch PRTG Network Monitor, head straight to the configuration wizard to get started. This wizard will run you through the main configuration settings required to get the application up and running, including the adding of servers to monitors and which sensors to use.
12. MiTeC Network Scanner
MiTeC Network Scanner is a modest yet feature rich network scanner for detecting network devices which include remote command execution and shutdown functionality, as well as Active Directory scanning and a bunch of in-built network tools as some of its key features.
When you launch MiTeC Network Scanner, start by selecting one of the scans to run from the Scan section on the top ribbon.
13. Splunk
Splunk is a data collection and analysis platform that allows you to monitor, gather and analyze data from different sources on your network (e.g., event logs, devices, services, TCP/UDP traffic, etc.). You can set up alerts to notify you when something is wrong or use Splunk’s extensive search, reporting, and dashboard features to make the most of the collected data. Splunk also allows you to install ‘Apps’ to extend system functionality.
Note: When you first download and install Splunk, it automatically installs the Enterprise version for you to trial for 60 days before switching to the Free version. To switch to the free version straight away, go to Manager > Licensing.
When you login to the Splunk web UI for the first time, add a data source and configure your indexes to get started. Once you do this, you can then create reports, build dashboards, and search and analyze data.
14. Angry IP Scanner
Angry IP Scanner is a standalone application that facilitates IP address and port scanning. It is used to scan a range of IP addresses to find hosts that are alive and obtain information about them (including MAC address, open ports, hostname, ping time, NetBIOS information, etc.).
When you execute the application, go to Tools > Preferences to configure Scanning and Port options, then go to Tools > Fetchers to choose what information to gather from each scanned IP address.
15. Icinga 2
Dream daddy: a dad dating simulator 0 11. Icinga is a Linux based fully open source monitoring application which checks the availability of network resources and immediately notifies users when something goes down. Icinga provides business intelligence data for in-depth analysis and a powerful command line interface.
When you first launch the Icinga web UI, you are prompted for credentials. Once you’ve authenticated, use the navigation menu on the left-hand side to manage the configuration of hosts, view the dashboard, reports, see a history of events, and more.
16. Observium Community
Observium Community is an intuitive SNMP-based network management and monitoring tool that auto-discovers devices on your network and reports back on their status. It runs on Linux and supports a multitude of device types, platforms and operating systems including Cisco, F5, Citrix, Juniper, Windows, Linux and more.
Start by adding devices to monitor either manually or via the auto-discovery feature, which probes the network looking for SNMP configured devices. After devices have been added, go to the Overview page to review the status of each device.
17. NetXMS
NetXMS is multi-platform network management and monitoring system that offers event management, performance monitoring, alerting, reporting and graphing for the entire IT infrastructure model. NetXMS’s main features include support for multiple operating systems and database engines, distributed network monitoring, auto-discovery, and business impact analysis tools, amongst others. NetXMS gives you the option to run a web-based interface or a management console.
Once you login to NetXMS you need to first go to the “Server Configuration” window to change a few settings that are dependent on your network requirements (e.g., changing the number of data collection handlers or enabling network discovery). You can then run the Network Discovery option for NetXMS to discover devices on your network automatically, or add new nodes by right-clicking on “Infrastructure Services” and selecting Tools > Create Node.
18. WirelessNetView
WirelessNetView is a lightweight utility (available as a standalone executable or installation package) that monitors the activity of reachable wireless networks and displays information related to them, such as SSID, Signal Quality, MAC Address, Channel Number, Cipher Algorithm, etc.
As soon as you execute WirelessNetView, it automatically populates a list of all reachable Wi-Fi networks in the area and displays information relevant to them (all columns are enabled by default).
Note: Wireless Network Watcher is a small utility that goes hand in hand with WirelessNetView. It scans your wireless network and displays a list of all computers and devices that are currently connected, showing information such as IP address, MAC address, computer name and NIC card manufacturer – all of which can be exported to an HTML/XML/csv/txt file.
19. Riverbed Xirrus Wi-Fi Inspector
Riverbed Xirrus Wi-Fi Inspector can be used to search for Wi-Fi networks, manage and troubleshoot connections, verify Wi-Fi coverage, locate Wi-Fi devices and detect rogue Access Points. Riverbed Xirrus Wi-Fi Inspector comes with a built-in connection, quality and speed tests.
Once you launch Wi-Fi Inspector and choose an adapter, a list of available Wi-Fi connections is displayed in the “Networks” pane. Details related to your current Wi-Fi connection are shown in the top right-hand corner. Everything pretty much happens from the top ribbon bar – you can run a test, change the layout, edit settings, refresh connections, etc.
20. Wireshark
This list wouldn’t be complete without the ever-popular Wireshark. Wireshark is an interactive network protocol analyzer and capture utility. It provides for in-depth inspection of hundreds of protocols and runs on multiple platforms.
When you launch Wireshark, choose which interface you want to bind to and click the green shark fin icon to get going. Packets will immediately start to be captured. Once you’ve collected what you need, you can export the data to a file for analysis in another application or use the inbuilt filter to drill down and analyze the captured packets at a deeper level from within Wireshark itself.
Are there any free tools not on this list that you’ve found useful and would like to share with the community?
You may also like:
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Get your free 30-day trial
Get immediate results. Identify where you’re vulnerable with your first scan on your first day of a 30-day trial. Take the necessary steps to fix all issues.