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Knowledge Base

Virtual machine network failure due to duplicate IP addresses (1009143)

Last Updated: 2/21/2010Categories: Total Views: 27309Language:
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Symptoms

You cannot bring up up networking for ESX or virtual machines

Virtual machines cannot connect to the network

Virtual machines indicate that there is a duplicate IP address on the network

Resolution

Duplicate IP addresses on the network may cause virtual machine network failures.

To check for duplicate IP addresses:

Disable the virtual machine or ESX interface.

Ping the IP address to see if the IP responds.

Check arp from another box.

From Windows, ping the target IP address with the command:

c:\ ping x.x.x.x

Run the command:

c:\ arp -a

The output appears similar to:

Interface: IP_Address --- 0x4
Internet Address Physical Address Type
IP_Address MAC_address dynamic
IP_Address1 MAC_address1 dynamic
IP_Address2 MAC_address2 dynamic

Check the arp list of MACs to locate the device that has the conflicted MAC address.

From ESX or Linux, run the following command:

arping -I vswif0(eth0) x.x.x.x

The device in conflict reports its MAC address.

SSH or Telnet can reveal information about the duplicate IP address. From ESX or Linux, run the following commands:

ssh x.x.x.x
telnet x.x.x.x

From Windows run the following command:

c:\telnet x.x.x.x 22 (Checks to see if the firewall is blocking port 22)
c:\telnet x.x.x.x
c:\ net view \\x.x.x.x

If you determine that there are duplicate IP addresses, see Resolving virtual machine IP address conflicts issues (1008177) and Verifying gateway IP connection using the tcpdump command (1008017) for further troubleshooting information.

Detectable by VMware SkylineTM

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End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

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