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Network Analysis and Troubleshooting
Network-General Troubleshooting history
Killexams : Network-General Troubleshooting history - BingNews https://killexams.com/pass4sure/exam-detail/1T6-511 Search results Killexams : Network-General Troubleshooting history - BingNews https://killexams.com/pass4sure/exam-detail/1T6-511 https://killexams.com/exam_list/Network-General Killexams : How to use the Netstat command to troubleshoot network issues in Windows 11/10

Netstat (Network Statistics) is a command-line tool for monitoring and troubleshooting computer network issues. This tool shows you all your device’s connections in as much detail as you need.

With Netstat, you can view all your connections and their ports and stats. This information is valuable when setting up or fixing your connectivity. This article will introduce you to the Netstat command and the main parameters for filtering information displayed about your connections.

We’ll explore the following courses in this section:

  1. How to use the Netstat command.
  2. Use netstat parameters to filter connection information.
  3. Combining Netstat parameters.

Join me as we go through the above courses to help you better understand this tool and learn how to use it to troubleshoot your network issues.

1] How to use the netstat command

netstat command

Click on the Start button and search for Command Prompt. Open Command Prompt with elevated privileges by right-clicking on it and selecting the Run as administrator option.

You can open Netstat by typing the following command and pressing ENTER:

netstat

You may not understand what the columns mean if you’re new to networking.

  • Proto: The network protocol. It could be either TCP or UDP.
  • Local Address: The IP addresses and ports of your computer’s network interfaces for the given connections.
  • Foreign Address: The IP addresses and port names of the remote devices.
  • StateIndicates the state of the connection. For example, find out active and closed connections.

The netstat command shows you your active connections and their details. However, you’d notice that the foreign address column prints the IP address and port names.

To show the connections’ port numbers instead of the port names next to the IP addresses, use the following command:

netstat -n

Further, the system can disconnect or connect to networks, and the network details can change at intervals. Hence, we can use the following command to refresh the netstat network details at intervals using this command:

netstat -n 5

To stop the refreshing, press the CTRL + C key combination.

NOTE: The 5 in the command above refreshes the command every 5 seconds. If you wish to increase or shorten the interval, you can modify this value.

2] Use netstat parameters to filter connection information

The netstat command is a powerful command that can show you every detail about your device’s connections. Explore the most commonly used netstat parameters to find specific network details.

  • Display active and inactive connections

Show the networks that are active or inactive.

netstat -a
  • Display applications information

List all applications that are associated with the connections.

netstat -b
  • View network adapter stats

Show statistics on incoming and outgoing network packets.

netstat -e
  • Display foreign addresses’ fully qualified domain name (FQDNS)

If you don’t want to see the port numbers or names, the following netstat parameter will show your foreign addresses’ fully qualified domain names.

netstat -f
  • Show port numbers instead of names

Change the foreign address port names to port numbers.

netstat -n

Similar to netstat, and it has an extra column for every connection’s Process ID (PID).

netstat -o
  • Filter connections by protocol

Display the connections for the protocol you specify – UDP, TCP, tcpv6, or udpv6.

netstat -p udp

NOTE: You should change the udp part to the protocol whose connections you want to view.

  • View non-listening and listing port

Show connections and their listening and bound non-listening ports.

netstat -q

Categorize networks by available protocols – UDP, TCP, ICMP, IPv4, and IPv6.

netstat -s

Show the routing table of your current network. It lists every route to the destination and matrix available on your system. Similar to the route print command.

netstat -r
  • Display offload state connections

Show a list of connection offload states of your current connection.

netstat -t
  • See NetworkDirect connections

Shows all NetworkDirect connections.

netstat -x
  • Display connection Templates

Show your networks’ TCP connection templates.

netstat -y

3] Combining Netstat parameters

You can further filter the Netstat parameters to show you information about your connections any way you want. From the above commands, you only have to add a second parameter to show a combined view.

For instance, you can combine the -s and -e parameters to view the statistics for every protocol. This way, you can combine other parameters to get the desired results.

When mixing multiple Netstat parameters, you don’t need to include two dashes (-). You can use one dash (-) and append the parameter letters without a second one.

For example, instead of typing the following command:

netstat -s -e

You can write it as:

netstat - se

netstat se command

If you forget the parameters, a quick way to remember them is by asking netstat to help. Simply run the following command:

netstat /?

To stop the netstat query process, press the CTRL + C key combination.

Can we check network connectivity using netstat?

We can check network connectivity using the netstat or network statistics command. This allows us to see active network connections and their status. The tool can view incoming and outgoing network connections, routing tables, port listening, and usage statistics. This command can be handy for network administrators when troubleshooting network issues. By understanding how to use this command, you can quickly and efficiently diagnose problems with your network.

How do I see network issues in Windows?

You can check your network connection status in Windows quickly and easily. Select the Start button to do so and type “settings” into the search bar. Once you’re in the Settings menu, select “Network & internet.” The status of your network connection will be displayed at the top of the page. If you’re having trouble connecting to the internet, this is a helpful first step in troubleshooting the issue. You also check quickly, and if you see the wifi icon missing, you have a network issue.

netstat command
Sun, 13 Mar 2022 15:01:00 -0500 en-us text/html https://www.thewindowsclub.com/using-the-netstat-command-to-troubleshoot-network-issues
Killexams : The most common Wi-Fi problems and how to fix them

We’ve grown so accustomed to Wi-Fi being readily available for listening to music, streaming our favorite shows, and allowing us to work from home that we rarely think twice about being connected until we’re suddenly experiencing a Wi-Fi problem.

A loss of connection is disruptive to a daily routine, but most Wi-Fi issues are easy to fix, so you can get reconnected relatively quickly. When your Wi-Fi goes down, you can restore access on your own by troubleshooting some of these common problems.

See more

Slow or no internet access in certain rooms

Plugging an Ethernet cable into the back of a Wi-Fi router.
Casezy/Getty Images

Wi-Fi is radio waves, meaning your Wi-Fi router broadcasts in all directions from a central location. If your router is in a far corner of your house, then you’re covering a great deal of the outside world unnecessarily. If you can, move your router to a more centralized location. The closer you can put your router to the center of your coverage area, the better reception will be throughout your house.

If you have external antennas, you can try adjusting those, too. Alternating between fully vertical and fully horizontal positions can help it reach in multiple directions.

If you live in an apartment building, other routers might be interfering with yours. Free software, like NetSpot on Mac, Windows, and Android or Wi-Fi Analyzer for Android, can show you every wireless network nearby and what channel they’re using. If your router overlaps with nearby networks in particular rooms, consider switching to a less congested channel. If you need help switching to a less congested channel, be sure to visit our guide on changing the channel on your wireless router.

If none of that helps, your home might be too much for one router to handle. Consider purchasing a wireless repeater or setting up an old router to serve as one to extend the range of your main router. Upgrading to a whole-home mesh wireless system can also help with dead spots in certain areas of your home.

Slow internet everywhere

If your Wi-Fi speed is slow no matter where you are, try plugging a laptop into your modem directly and test your internet speed using a site like speedtest.net. If speeds are still down, the problem is likely with your internet connection, not your router. Contact your ISP.

If that’s not the issue, it could be that your current wireless channel is overcrowded by your devices or by those of other nearby networks. Consider changing the channel on your router in your router settings. Each router brand does that a little differently, though.

If that doesn’t help, performing a factory reset on your router and setting it up again may help. On most routers, there’s a Reset button that you can hold down with a paperclip, but we also have a guide if you need further help on resetting your router. Do so for 30 seconds, and the router should default to factory settings. Use our guide to setting up a wireless router to get everything properly configured, and see if that helps.

If none of that works and your internet is fine on a wired connection, your router might be dying. Consider buying a new one: Here are the best routers we’ve reviewed and why they’re great picks. If the router seems fine, then it might instead be your modem, which could suffer connectivity issues if it’s on its way out. If you’re looking to upgrade your modem as a fix, we also have a guide on some of the top modem-router combos. Upgrading to a Wi-Fi 6 or Wi-Fi 6E router can also help ease issues with congestion and support faster speeds, provided that your broadband plan is capable of these boosted speeds.

One device can’t connect to the Wi-Fi

Dell's XPS 15 laptop being used on someone's lap.

Sometimes you run into a Wi-Fi issue with one particular device. It’s probably just a momentary network issue. Try turning off the Wi-Fi on your device, then re-enabling it. If that doesn’t work, do the same with your router by unplugging it and then plugging it back in 30 seconds later.

If that doesn’t help, or if the problem reoccurs, consider deleting your current network from the list of saved networks on your device, then reconnect again.

If you’re running Windows 10 or 11, search for “wifi troubleshooting” and open the result, which should be Identify and Repair Network Issues. That will go through a series of diagnostics that may restore connectivity. On MacOS, you can run Wireless Diagnostics. Hold the Options key and click the AirPort (Wi-Fi) icon on the menu bar. Find Open Wireless Diagnostics, and then follow the on-screen instructions.

If none of that works, consider rebooting the device.

Nothing can connect to Wi-Fi

If you can’t connect to your Wi-Fi at all, plug your laptop into the router directly using an Ethernet cable, and see if you can connect that way. There are different types of Ethernet cables, so be sure to read our guide to select the best one that will work for you. If that works, your Wi-Fi is the problem — but if it doesn’t, then your internet may be down altogether. Check your ISP’s webpage and social accounts, or deliver them a call to see if they are reporting problems. Sometimes providers can be a little slow to note issues, so you can also check with a monitoring site like Downdetector and see if other users in your region are reporting problems.

Resetting your router can fix myriad issues, and an inability to connect is one of them. Press the Reset button on the back of the router with a paperclip for 30 seconds, and the router should default to factory settings. Use our guide to setting up a wireless router to get everything properly configured.

If that’s no use, you may need to consider buying a new router. There are plenty of options today, and choosing the right one can help alleviate some connectivity options in the future. These options include mesh routers, extended range routers, and Wi-Fi 6 routers.

Connections drop at random times

Is there some sort of pattern? Do connections drop whenever you use the microwave? It may sound weird, but some routers have trouble with this, especially on the 2.5GHz frequency or if you’re using an older microwave with shield problems.

It could be that you’re experiencing interference from other networks or devices. If your neighbors are heavy Wi-Fi users at a particular time each day, this could be slowing you down. Changing your router’s channel might help. You can use NetSpot on Mac and Windows and Wi-Fi Analyzer for Android to show you every wireless network nearby. If yours overlaps with nearby networks, switching to a less congested channel in your router settings can help. We have a guide that will walk you through changing the channel on your router.

If that doesn’t work, try performing a factory reset on your router by pressing a paperclip into the miniature hole on it.

Wi-Fi network disappears entirely

The Almond 3 Wi-Fi hub has a smart LED screen.

If you lose track of your Wi-Fi network on any device, it’s possible that your router reset itself. Do you see an unprotected network named after your brand of router? That might be yours. Connect a laptop or desktop to it via an Ethernet cable, then use our guide to setting up a wireless router to get everything properly configured again.

If you don’t see such a network, plug your laptop into the router with an Ethernet, and see if you get a connection. Use our guide to finding your router’s IP address and login information for more help. Also, if you don’t have a cable, check out our guide on how to choose the right Ethernet cable.

The network connects, but there’s no internet access

It might sound like a tired tip, but try resetting your modem by unplugging it and plugging it back in. If that doesn’t work, also try resetting your router the same way, assuming it’s a separate device.

Connect a laptop or desktop to your router with an Ethernet cable (these are the best ones). If this works, then the router is having a problem and may need to be reset. If there’s still no internet, though, you may have an outage. Contact your ISP.

Router crashes regularly and only restarting it helps

If your router needs to be restarted regularly, consider giving it a full reset. On most routers, you’ll find a Reset button that you can hold down with a paperclip. Do so for 30 seconds, and the router should default from factory settings. Use our guide to setting up a wireless router to get everything properly configured.

If that doesn’t work, your router may be on its way out. Your only real option is to return it if it is within its warranty period or to buy a new one.

Wi-Fi connection lost when logging back into the computer

This problem can crop up on Windows 10 due to an issue with Fast Startup. Fast Startup keeps certain processes running so you can log back in very quickly. However, this can sometimes cause a bug with the wireless driver that prevents it from reconnecting to Wi-Fi properly. In the short term, you can turn off Fast Startup to prevent this problem. Search for Power Options in your Windows 10 or Windows 11 search bar and go to this section of the Control Panel. Select Choose What the Power Button Does on the left-side menu, and then look at the new section Shutdown Settings. Find the option to Turn On Fast Startup and make sure it is deselected.

In the long term, your wireless network adapter may need to have its driver updated to fix any bugs causing this issue. You can follow our guide on how to update Windows 10 drivers for more information.

Forgot the Wi-Fi password

Selecting the Wi-Fi devices on a smartphone.

If you really can’t remember your Wi-Fi password, and there are no notes or cards with it written down somewhere, you’ll have to reset your router. Use a paperclip to press the hidden switch in the pinhole on the back of your router for 30 seconds. It should then default to factory settings.

Use our guide to setting up a wireless router to get everything properly configured.

Unknown devices on my Wi-Fi network

Log into your Wi-Fi app or administrator settings (which you can find by searching your IP address on your browser — here’s how to find it). Look for a list of currently connected devices and pinpoint the devices you don’t recognize. First, make sure these don’t represent connections you didn’t realize you had — each smart device will have its own connection, for example, and they can have some strange titles if you didn’t name them. Game consoles and TVs may also be connected.

If you’ve ruled out all your own potential devices and there’s still a connection or two you don’t recognize, it’s possible someone else is hijacking your Wi-Fi network. In this case, look in your settings for an option to block these devices on your Wi-Fi and ban their MAC addresses, if possible. Then change your Wi-Fi password, and reboot your router (here’s how). This may not stop especially determined hackers, but it’s usually enough to kick unwanted guests off your network.

A recent update broke Wi-Fi

Windows update settings menu.

This can happen with some operating system updates. Windows 10 updates in mid-2020 had bugs that stopped some users from connecting to their Wi-Fi networks or even seeing a Wi-Fi connection at all. Similar updates to iOS, Android, and other platforms also have created bugs in the past that disrupt Wi-Fi connections.

When something like this happens, it’s best to wait for a patch that fixes the problem. In the meantime, remove the update and roll back your system to an earlier version to help get your online connectivity back.

While routers can last for years without needing a replacement, keep in mind that some problems can develop with age — a router may start lacking support for new device updates and similar issues that prevent it from working properly (as seen when Apple discontinued the AirPort Extreme, for example). That’s a sign that it’s time to look for a new router.

The satellite routers on my mesh network aren’t connecting

Plugging a wireless node into a home network.

Make sure that your satellite devices are powered up and turned on. If they are, try unplugging and replugging the problematic device and see if it will connect to your network then. If your router app allows you to restart a Wi-Fi point (Google’s Home app, for example, allows this), then reboot that point and see if this helps, too.

Google also allows you to run a test to make sure the network is set up properly. You can find Wifi points on the Home app, under Test mesh. If the test comes back with a weak or failed connection, you should try repositioning your satellite routers to be closer to your primary router. This also is a good tactic for any mesh system that keeps dropping its satellite points — they could be too far away from the primary point.

You can also double-check to make sure that your satellite router devices have a different SSID than your primary router. If they were accidentally all assigned the same SSID, then the mesh network may not be able to coordinate properly.

If your router still seems unable to connect, then make sure that nothing significant has changed for your network settings. For example, if your ISP WAN (wide-area network) type changed for some reason, you may have to go back into the settings for the router and make sure that the right WAN setting is chosen.

There are additional special cases where certain Wi-Fi technology can interfere with mesh networks, so it’s also a good idea to contact router support directly and explain your situation if nothing is working.

My smart device isn’t connecting to Wi-Fi

Google's range of wireless networking products.

First, make sure that your smart device and your router are both updated. Then try resetting your router and rebooting your smart device. You can either unplug and plug in the smart device or check its app for a reboot option — the Google Home app, for example, has a Reboot tool under each device section that you can use.

If the device still isn’t connecting properly, try moving it next to the router and seeing if it connects then — distance and interference can make a difference, especially for smaller smart devices. You should also double-check to make sure that your smart device doesn’t need a Zigbee hub to operate, which is more common among older smart devices but a problem that still occasionally crops up.

If your smart device keeps dropping a Wi-Fi signal, especially during busy times of the day, check to see if your router supports automatic band switching for devices. If it does, try turning this feature off. Sometimes a router will try to switch a smart device to a different band, but the device isn’t ready for that, causing it to lose a connection. There may also be issues with connecting to a mesh router, and you may have to be very specific about your network connection to make smart devices work.

It’s also a good idea to check if your particular device is suffering from temporary bugs that make connecting to Wi-Fi difficult or impossible. Nest minis and HomePod minis have both encountered such errors in the past. In these cases, a fix is usually patched in before too long, so keep making sure that your device is updated. Sometimes operating system updates, like a new iOS patch, also can affect smart device performance.

Finally, there are a number of other router settings that may block smart devices. If you can’t find what’s wrong, call up support for that device and explain that you think your router is having trouble connecting.

My game console can’t connect to Wi-Fi

Sony's PlayStation 5 console up close.

First, check social media and Downdetector to make sure nothing is wrong with your gaming platform — sometimes Xbox Live or Playstation Network goes down for any number of reasons, but they’re typically back up again after a short period.

If everything looks all right there, reboot both your router and your game console and see if they can successfully connect. This is also a good time to test your internet connection. Major systems like Xbox and PlayStation have an option in their Settings menu to test your internet connection. On PlayStation, head to Settings, then Network, then select Test Internet Connection. On Xbox, go to Profile & System, select Settings, and in the General section, select Network Settings, where you will find an option to Test Network Speed & Statistics. This can provide more information about what’s going wrong and even tips on what you may need to change.

If your console and router seem to be acting properly but Wi-Fi keeps dropping, you may want to try moving the two devices closer to each other to see if the Wi-Fi signal improves. Try to remove any material or objects between the console and router: Placing both in a high, clear location often brings the best results.

You also can check our guides on troubleshooting your Playstation and fixing problems on Xbox to learn more.

Can’t connect to wireless printer

Epson printer sitting on a desk in an office.

First, make sure you are trying to connect to your Wi-Fi and not via Wi-Fi Direct — they are two different technologies. We also highly suggest the traditional routine of turning everything off and back on again, especially if your printer has connected to Wi-Fi successfully in the past. If your printer is far away from your router and keeps running into Wi-Fi errors, try moving it to a closer position.

If it looks like your printer is connected to Wi-Fi but you can’t get it to work, head into your printer settings on your computer and make sure the correct default printer is selected. Microsoft also has some troubleshooters you can run to see if they pick up on anything obviously awry.

We also suggest checking your router security, firewalls, and VPN security to see if any of them are identifying the printer as a strange device and refusing a wireless connection. You may need to disable certain firewalls or reconfigure security protocols to use your printer successfully. When all else fails, uninstall your printer drivers and reinstall the more recent versions to see if this makes a difference.

And if your printer isn’t wirelessly enabled, consider upgrading to one that is. We have some recommendations for some top printers, laser printers, and multifunction printers that can be used wirelessly and connect to your home network.

Can’t connect to a guest Wi-Fi network that I set up

Man sitting next to modem/router combo.

Guest Wi-Fi networks allow you to share your Wi-Fi with others in a secure way that helps prevent security issues. You’ve probably seen it on business routers, but it can be set up on home routers, too. If someone is having trouble connecting to the guest network but otherwise the Wi-Fi seems to be working, there are a few things you can try.

First, if you just set up your guest network, wait a few minutes. It may take a little time for the network to show up. If the guest network is visible, take a minute to head into your router app and check settings. Settings like Public Wi-Fi Active and Allow Guests to Access My Local Network should always be enabled. If it’s still not working, reset your router and try again.

Keep in mind, some guest networks have a stricter limit on how many devices can use them. If you have over a dozen people already on the guest network, others may not be able to log on.

I’m not getting Wi-Fi 6 or 6E capabilities even with a Wi-Fi 6 router

A TP Link Archer AX3000 Wi-Fi 6 router on a desk

Wi-Fi 6 offers a host of improvements from older Wi-Fi standards, including improved performance, less latency, and better security. But if you don’t think you’re getting Wi-Fi 6 features from a router that supports it, something could be wrong with your setup.

First, keep in mind that repeaters and extenders may not be compatible with Wi-Fi 6 even though your router is. If your device has picked up the signal from an extender, Wi-Fi 6 benefits may not be making the trip.

Additionally, most devices will need at least partial support for Wi-Fi 6 features to be able to use them. Devices that are several years old may not be compatible with any Wi-Fi 6 changes. That includes your phone and laptop, as well as smart devices that you might be using.

Even desktop computers may struggle with this. Internal Wi-Fi adapters may struggle to pick up on Wi-Fi 6 benefits when you switch to a new router, even if they are technically compatible. You should update your Wi-Fi drivers to fix any potential issues.

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Sun, 20 Nov 2022 12:47:00 -0600 Tyler Lacoma en text/html https://www.digitaltrends.com/computing/wi-fi-problems-and-solutions/
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