Network Troubleshooting - Revision history

Sstrizhov at 19:52, 2 October 2026

2026-10-02T19:52:33Z

2026-10-02T19:52:10Z

← Older revision		Revision as of 19:52, 2 October 2026
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	The speed can be a little less than what's shown on ethtool, that's normal. For example, a network device may display having speeds of 10Gbi/s but in actuality it's closer to 9.40Gbi/s		The speed can be a little less than what's shown on ethtool, that's normal. For example, a network device may display having speeds of 10Gbi/s but in actuality it's closer to 9.40Gbi/s
	</blockquote>		</blockquote>

			[Category:Serge]

2026-10-02T19:51:37Z

← Older revision		Revision as of 19:51, 2 October 2026
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	Note: One of the steps requires administrative access.		Note: One of the steps requires administrative access.

			=== General First Step ===

	1. <b>Install iperf3. This will be your network testing tool.</b>		1. <b>Install iperf3. This will be your network testing tool.</b>
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	sudo dnf install -y iperf3		sudo dnf install -y iperf3
	</syntaxhighlight>		</syntaxhighlight>

			<blockquote>
			You can check if it's properly installed by running iperf3 and seeing any output. If it says 'command not found', then it didn't install or doesn't exist.
			</blockquote>

	=== Server Side (where to test the connection from) ===		=== Server Side (where to test the connection from) ===

2026-10-02T19:50:29Z

← Older revision		Revision as of 19:50, 2 October 2026
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	Last Updated October 2nd, 2026.		Last Updated October 2nd, 2026 for Rocky Linux 9.

	~~== Steps to Troubleshoot a local connection on a~~ Rocky Linux ~~Machine ==~~

	Note: One of the steps requires administrative access.		Note: One of the steps requires administrative access.

2026-10-02T19:50:14Z

← Older revision		Revision as of 19:50, 2 October 2026
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	Last Updated October 2nd, 2026.		Last Updated October 2nd, 2026.

	=== Steps to Troubleshoot a local connection on a Rocky Linux Machine ===		== Steps to Troubleshoot a local connection on a Rocky Linux Machine ==

	Note: One of the steps requires administrative access.		Note: One of the steps requires administrative access.
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	</syntaxhighlight>		</syntaxhighlight>

	==== Server Side (where to test the connection from) ====		=== Server Side (where to test the connection from) ===

	2. After installing iperf3, run the following command to start your origin server for testing link speeds. This will need an open port on that machine.		2. After installing iperf3, run the following command to start your origin server for testing link speeds. This will need an open port on that machine.
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	</syntaxhighlight>		</syntaxhighlight>

	==== Client Side (where to test the connection with) ====		=== Client Side (where to test the connection with) ===

	2. <b>Run the following command to find the network you want to test.</b>		2. <b>Run the following command to find the network you want to test.</b>

2026-10-02T19:49:54Z

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 === Steps to Troubleshoot a local connection on a Rocky Linux Machine ===
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 . <b>Install iperf3. This will be your network testing tool.</b>
 . <b>Run the following command to find the network you want to test.</b>
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 <syntaxhighlight lang="bash">
-iperf3 -c {chosen testing machine} -P 4 -p {port of machine} -t 30
+iperf3 -c {hostname/local ip of server machine} -P 4 -p {port of machine} -t 30
 </syntaxhighlight>

2026-10-01T21:25:30Z

← Older revision		Revision as of 21:25, 1 October 2026
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	== Steps to Troubleshoot a local connection on a Rocky Linux Machine ==		=== Steps to Troubleshoot a local connection on a Rocky Linux Machine ===

	Note: One of the steps requires administrative access.		Note: One of the steps requires administrative access.

2026-10-01T21:25:06Z

← Older revision		Revision as of 21:25, 1 October 2026
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	Note: One of the steps requires administrative access.		Note: One of the steps requires administrative access.

	1. Install iperf3. This will be your network testing tool.		1. <b>Install iperf3. This will be your network testing tool.</b>

	2. Run the following command to find the network you want to test.		2. <b>Run the following command to find the network you want to test.</b>

	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
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	</blockquote>		</blockquote>

	3. Run ethtool with the name of the network device as an argument.		3. <b>Run ethtool with the name of the network device as an argument.</b>

	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
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	</blockquote>		</blockquote>

	4. Run ethtool with the '-i' flag to get the lspci slot identifier.		4. <b>Run ethtool with the '-i' flag to get the lspci slot identifier.</b>

	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
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	</blockquote>		</blockquote>

	5. Get the LnkSta and LnkCap values from lspci.		5. <b>Get the LnkSta and LnkCap values from lspci.</b>

	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
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	</blockquote>		</blockquote>

	6. Run iperf3 to get active network speed data.		6. <b>Run iperf3 to get active network speed data.</b>

	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">

2026-10-01T21:24:08Z

← Older revision		Revision as of 21:24, 1 October 2026
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	1. Install iperf3. This will be your network testing tool.		1. Install iperf3. This will be your network testing tool.

	2. Run the following command ~~and look at~~ the network you want to test.		2. Run the following command to find the network you want to test.

	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">

2026-10-01T21:23:44Z

more changes

← Older revision		Revision as of 21:23, 1 October 2026
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	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
	`ifconfig`		ifconfig
	</syntaxhighlight>		</syntaxhighlight>

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	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
	`ethtool {network device name}`		ethtool {network device name}
	</syntaxhighlight>		</syntaxhighlight>

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	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
	`ethtool -i {network device name}`		ethtool -i {network device name}
	</syntaxhighlight>		</syntaxhighlight>

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	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
	`sudo lspci -vv -s {bus_info_value} \| grep “Lnk”`		sudo lspci -vv -s {bus_info_value} \| grep “Lnk”
	</syntaxhighlight>		</syntaxhighlight>

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	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
	`iperf3 -c {chosen testing machine} -P 4 -p {port of machine} -t 30`		iperf3 -c {chosen testing machine} -P 4 -p {port of machine} -t 30
	</syntaxhighlight>		</syntaxhighlight>