| [[DNS]] name resolution in [[Mac OS X Snow Leopard|Mac OS X 10.6]] (Snow Leopard)]] fails for hosts with a [[CNAME]] record.<ref>[http://arstechnica.com/business/news/2010/09/there-is-no-plan-b-why-the-ipv4-to-ipv6-transition-will-be-ugly.ars There is no Plan B: why the IPv4-to-IPv6 transition will be ugly]</ref> (Most publicly-accessible hosts have CNAME records.) Snow Leopard supports neither [[DHCPv6]] nor [[ICMPv6|RDNSS]], so DNS servers must be specified manually.