Good day. I'm trying to reduce the amount of unnecessary traffic in the network and found analyzing wireshark capture file that there is about 20% of ipv6 traffic from the total amount of traffic I captured. All my devices in the network are ipv4 only and I have no ipv6 infreatructure at all. So I would like to ask whether it is common practice to block ipv6 traffic as it is not used in some networks and if yes then I would like to understand how to do it properly? I tried to do it over EAP ACL but in the list of protocols ipv6 is missed.

Any suggestions? 

Thanks in advance