local link IPv6 address at default gateway

[darkdragon001]

When I try to add the local link IPv6 address fe80::1 as default gateway in my ESXi 5.5, I get the following error even though the automatically assigned IPv6 address is a local link fe80:: address

Call "HostNetworkSystem.UpdateIpRouteConfig" for object "networkSystem" on ESXi "148.251.11.38" failed.

Operation failed, diagnostics report: Unable to set VMkernel gateway address (fe80::1) :Sysinfo error on operation returned status : Network unreachable. Please see the VMkernel log for detailed error information. Please verify your IP settings and try again.

Our networking facility handles the gateway this way. How could I get this working?

[Davoud Teimouri]

ESXi has one default route at time, so you can't add another gateway as default route.
You have to remove your current IP configuration and then add new IP configuration with IPv6 addresses.

You need to restart after configuring that.

[darkdragon001]

This means that I cannot have IPv4 and IPv6 at the same time?

But when I leave the field blank, I get a warning that there is no IPv6 route specified...

[Davoud Teimouri]

I have a question. Do you need to IPv6?

If you don't need that, disable IPv6 on your ESXi.

You can do it from DCUI or Shell.

[darkdragon001]

I do not need it necessarily for the host system itself.

When I disable it, can I still access IPv6 clients within a virtual network?

[Davoud Teimouri]

I guess, there is no effect on virtual machines traffics, because vSwitches working on layer2.
The IP is for management traffic.