Public DNS - recursion no - Access to the Internet

[Jarek Buczyński]

Threat's growing :) 
Below is next quote:

"If you use multiple nameserver directives, don't use the loopback address!
There's a bug in some Berkeley-derived TCP/IP implementations that can cause
problems with BIND if the local nameserver is down. The resolver's connected
datagram socket won't rebind to a new local address if the local nameserver
isn't running, and consequently the resolver sends query packets to the
fallback remote nameservers with a source address of 127.0.0.1. When the
remote nameservers try to reply, they end up sending the reply packets to
themselves."

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Best regards