Simple IPv4/IPv6 Test. This image based test is provided for those with browsers or browser plugins incompatible with the main test.This page provides only a subset of features, but should be enough for a simple pass/fail.
You appear to have no IPv6 at this time.. You appear to have no IPv6 address. It looks like you have only IPv4 Internet service at this time. Don't feel bad - most people are in this position right now.
At some point, when the percentage of "broken" users has gone significantly down, I'll consider making test-ipv6.com dual-stack. At last check, March 2017, we still see 0.2% broken visiting test-ipv6.com.
This will attempt to explain why you may have PMTUD problems when using test-ipv6.com; and possible solutions. Unfortunately, it is beyond the ability of this site to be able to clearly articulate *your* specific problem.