18.01 is unsupported for a long time. i suggest trying with 19.04 or latest 
master as a 1st step. Also trying with other nic may give some clue where 
problem is....

— 
Damjan

> On Jun 20, 2019, at 9:09 AM, [email protected] wrote:
> 
> Hi,
>  
> I am running standard vpp18.01(without any changes) with Mellanox(ConnectX-4) 
> NIC and trying to ping vpp over IPv6 from some external client machine. I 
> found that client is continuously sending Multicast Neighbor Solicitation 
> messages but those multicast messages are not reaching the vpp.
> I checked by enabling the vpp trace but didn't find any multicast Neighbor 
> solicitation message from client. However, i also verified that when 
> multicast packets are initiated by vpp, then vpp is able to send multicast 
> packets and able to receive unicast response.
> So, receiving a multicast packet in vpp seems to be a problem.
>  
> Has anyone observed this behavior or is there any existing bug in vpp 18.01 
> for not receiving multicast ipv6 packets by vpp with Mellanox NICs?
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