Unable to ping Tier-0 / Tier-1 gateway with EUI-64 IPv6 IP address

Products

• VMware NSX-T Data Center

Issue/Introduction

• EUI-64 (Extended Unique Identifier-64) is a method used in networking to create a 64-bit unique identifier for devices, typically for IPv6 address assignment. 
• EUI-64 IPv6 IP addresses configured in the NSX are not effective.
• If the IPv6 address is configured in the Segment, you cannot see it in the DR Instance using the following command. 

  net-vdr -l -L ########-####-####-####-########## --brief

  DR ########-####-####-####-############ LIF Information :

  State Legend: [A:Active], [d:Deleting], [X:Deleted], [I:Init], [SF-L:Soft Flush LIF] 
  Modes Legend: [B:Bridging], [E:Empty], [R:Routing, R-L:Link, R-B:Backplane], [D:Distributed], [DL:Downlink]

  Id                Mode       State    Ip/Mask                           Mac                Lif UUID
  --                -----      -----    -------                           ----               --------
  Overlay:1a2b3     R,DL       A        ##.##.##.##/##                      ##:##:##:##:##:##  ########-####-####-####-############

Environment

VMware NSX-T Data Center 3.0.x,3.1.x

Cause

Before NSX-T 3.2, NSX would ignore EUI-64 addresses. NSX uses the following conditions to check if an IPv6 address is an EUI-64 address:

• The address is a IPv6 address.
• The prefix length is less than or equal to 64.
• The address does not start with "fe80::/64".
• The address's low bits AND 0x000000FFFE000000L = 0x000000FFFE000000L.

Resolution

Two resolutions for this issue:

Upgrade to NSX-T Data Center 3.2.0.
As workaround, use a non-EUI-64 address.