The snoop command can capture both IPv4 and IPv6 packets. This command can display IPv6 headers, IPv6 extension headers, ICMPv6 headers, and Neighbor Discovery (ND) protocol data. By default, the snoop command displays both IPv4 and IPv6 packets. If you specify the ip or ip6 protocol keyword, then the command displays only IPv4 or IPv6 packets. The IPv6 filter option enables you to filter through all packets, both IPv4 and IPv6, displaying only the IPv6 packets. See Monitoring IPv6 Network Traffic and the snoop(1M) man page.