Re: Trouble Setting MTU to 9000 on ESX host and guests

vmk0       Management Network  IPv6      fe80::a236:9fff:fe3e:cbcc               64                              a0:36:9f:3e:cb:cc 1500    65535     true    STATIC, PREFERRED

It looks like your vmk0 is using the IPV6 insist of the IPv4,Can you try to disable the IPv6 in your vmk0?