Cisco Packet Tracer : Ping Issue

[TracerBell02]

Hello everyone,

I have a problem that I can't seem to solve,
I can't ping in ipv6 on two neighboring interfaces :

Between Gig/0/0/0 and Fa0/1 --> PING IPV6 OK and IPV4 OK

Between CORE and MLS1 ipv6 doesn't work (ipv4 work)

Between CORE and MLS2 ipv6 doesn't work too (ipv4 work)

I tried to change the switch model and cable but without success ...

I'm attaching the packet tracer below,

Thanks in advance.

[marce1000]

        - FYI   : Community group for Packet Tracer project questions

 M.