In preparation for World IPv6 Day on 8 June 2011, I thought I’d check my connectivity..

I visited a test-ipv6 page .. but the page took too long to open, had broken images, timeouts and readiness score 1/10 !

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So I changed my MTU to 1280 and tested again

(In linux you might type: /sbin/ifconfig eth0 mtu 1280)

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I then found this relevant discussion: IPv6 and path MTU discovery black holes

UPDATE 4/6/2011: An MTU of 1492 also seems to work correctly in my setup (as @chatasos prefers http://goo.gl/KRgm5)