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TroubleshootingRSS

Network Troubleshooting

Troubleshooting network connection issues using Address Resolution Protocol (ARP) (1008184)

This article troubleshoots network connection issues using ARP.

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Troubleshooting network connectivity with Virtual Switch Tagging (VST) / External Switch Tagging (EST) mode on an ESX/ES...

You experience these symptoms on ESX/ESXi vSwitch port groups: Service Console is unable to ping the gateway IP Virtual machine fails to ping gateway VMkernel networking issues You receive one or more of the following errors: Destination Hos ...
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Troubleshooting Wires in Wireless Networks

When troubleshooting wireless networks, it's good to remember just how many actual wires are involved, especially when dealing with wireless network bridges. Here are two examples from the kingdom of WLAN that required this stalwart engineer to do battle ...
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Troubleshoot ESXi networking with tcpdump-uw (Rickard Nobel)

A very useful help in network troubleshooting is the ability to actually look at the packets being sent and received. ESXi includes the tcpdump-uw tool to verify and troubleshoot vmkernel network traffic. In this blog post we shall see how to study and t ...
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Troubleshooting Network Teaming Problems in ESX/ESXi (VMware KBTV)

Perhaps one of the most common types of problems we encounter here at VMware Technical Support is relating to loss of network connectivity to one or more virtual machines on a host. As vague and simple as that description is, it may not always be clear wh ...
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Unsupported Network Configurations in Virtual Appliances (vNinja.net)

My recent experience with setting up vCenter Operations Manager on a standalone ESXi host, and the always excellent William Lam´s post Automating VCSA Network Configurations For Greenfield Deployments got me thinking. There are several other appliances o ...
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Manually reloading the ESX host physical NIC driver when vmnic stops passing traffic (1002899)

One of the physical network adapters in a ESX host stops passing traffic. Physical network adapter fails. vmnic does not pass traffic. vmnic fails.

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Who is clogging my router? (V12N)

A little while ago we experienced really poor Internet performance at work. It is not the best connection, but the experience indicated that something was wrong. In a simple Internet configuration with Cisco router; How to identify who is clogging the net ...
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Network Troubleshooting Using ESXCLI 5.1

When it comes to network troubleshooting in an ESXi host, there are various types of information that can be useful to a vSphere administrator such as basic information like a virtual machine’s IP Addresses, MAC Addresses, Uplink ports, Port ID, etc. to t ...
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Workaround for Multi-NIC vMotion Unicast Flooding in vSphere 5

In my previous article "The Good, The Great and the Gotcha with Multi-NIC vMotion in vSphere 5" I discussed an issue that could cause unicast port flooding. One of my large financial customers has come up with a workaround for this problem. This ...
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Network troubleshooting, Part I: What physical NIC does the VM use?

If you encounter a network issue in a VM (like bad performance or packet drops) a good first question to ask yourself is: Is this issue limited to the VM or can it be pinned to one of the host's physical NICs?So, you need to find out what physical NIC (pN ...
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Network troubleshooting, Part III: A real life example (Broadcom NICs dropping packets)

Recently we had a strange problem inside a Linux VM: a rsync-job that was used to copy data from a local disk to a NFS-mounted share reproducibly failed during data copy with a "broken pipe" error message.Using the methods I wrote about in Part I and Part ...
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vSphere Advanced Network Troubleshooting - DV Port Naming Conflicts

In this video, I cover some advanced network troubleshooting on a vSphere host that has a conflicting DV Port / Portgroup name.

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vSphere 5 Network Coredump Collector

Since Auto Deploy allows for the creation fo diskless/stateless hosts there is a need to have a network service to store core dumps so that diagnostic information can be collected for support in the hopefully unlikely event of a host crash (PSOD). The vCe ...
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