Center Server, I saw that some of the hosts repeatedly were being disconnected
and connected again. Also the new hosts were not reachable from the network.
experience this sort of problems.
giving messages stating “Host 00:25:B3:XX:XX:XX in vlan 250 is flapping between
port Gi4/8 and port Gi4/5” and ICMP-request(ping) to the hosts suffered from packet
loss. Having seen this symptoms before, I was sure that it had something to do with
duplicated MAC-addresses and it had to be a software-related problem because
hardware MAC-addresses are unique.
host. Unfortunately the GUI for ESXi management (the vSphere client) doesn’t provide the option to reset a MAC-address, so I had to get in the console of ESXi and try to set things straight from there.
described my problem as a bug and offered a workaround (http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1031111).
Work around the issue by manually configuring the MAC address on the ESX host as follows:
- In the troubleshooting console run the following command: esxcfg-advcfg -s 1 /Net/FollowHardwareMac.
- Restart the server.
had a spoofed MAC-address. I also tried setting the value to 0 so vmk0 would
get a VMware MAC-address, but that also didn’t do the trick.
ip-parameters. This included two simple steps:
1. esxcfg-vmknic -d "Management Network"
2. esxcfg-vmknic -a -i 10.X.X.X -n 255.X.X.X "Management Network"
Started his working life as a system manager at a health care organization. Is now a dedicated technical consultant at PepperByte. Specialist in virtualization and security.
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