(if what is shown on the patch page seems a little obique :-)
The way this works is actually pretty simple. The DNS servers for .com and .net should only send to you NS records. NS records are like pointers to other DNS servers. This patch rejects everything except NS records when they come from the VeriSign servers. Now when they send to you an A record (which has the IP address inside it), it will ignore it and the patch will instead give you the "does not exist" response.
This is a good way to work around the problem, because it will still work correctly even if VeriSign changes the IP address that they use.
The Acme::DNS::Correct module does not work this way. It merely looks for the hardcoded IP address in the response and filters it out. It will not work if the IP address is ever changed. Well, it's only an Acme module, after all.
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