This packet allows all recursive requests to the local DNS server.
<packet version="1.4.2.0">
<dns>
<set-recursion>
<value>on</value>
</set-recursion>
</dns>
</packet>
This packet allows recursive requests coming from the local net to the local DNS server.
<packet version="1.4.2.0">
<dns>
<set-recursion>
<value>localnets</value>
</set-recursion>
</dns>
</packet>