> root@vmshe-dell2950-02 ~# vmkping -6 fe80::2a0:98ff:fe0a:1d59
PING fe80::2a0:98ff:fe0a:1d59 (fe80::2a0:98ff:fe0a:1d59): 56 data bytes
sendto() failed (No route to host)
Please provide the outgoing interface (scope) as well, just as you did with ping6. This is necessary for IPv6 since the destination is a link-local address and it has to be scoped:
$ vmking -6 fe80::2a0:98ff:fe0a:1d59 -I vmk0 ;# assuming vmnic1/vmnic4 are reachable to the filer
Thanks,
--shekhar