whether to return RRSIG RRs

Cathy Zhang zhangclcathy at gmail.com
Tue Jul 5 05:34:34 UTC 2011

I found words about RRSIG request in test code of BIND9:

    # Check direct query for RRSIG: If it's not cached with other records,
    # it should result in an empty response.

It's a test case for a recursive server which is set to validate the

Why shouldn't recursive server return RRSIG RRs to the client?

Is it a rule from RFC or for special reason?

Thanks a lot

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