Don’t forget to flush DNS cache when testing IPv6
March 22nd, 2010
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MacOSX resolvers can cache IPv4 addresses, making them preferable to IPv6-capable applications, such as web browsers. The apps are IPv6-capable, but if an IPv4 address is already cached for a given fully qualified domain name (FQDN), the apps can’t look up names properly to prefer IPv6 addresses when available. The fix is to manually clear your MacOSX DNS cache. Do that with the simple command:
sudo dscacheutil -flushcache