For complete information on the SonicOS implementation of IPv6, see the About IPv6.
The TraceRoute tool includes a Prefer IPv6 networking option.
When testing interconnectivity with routers and other hosts, it uses the first IP address that is returned and shows the actual TraceRoute address. If both an IPv4 and IPv6 address are returned, by default, the firewall will TraceRoute the IPv4 address.
If the Prefer IPv6 networking option is enabled, the firewall will TraceRoute the IPv6 address.