Re: DNS ACL ?
From: John Nemeth (jnemeth_at_victoria.tc.ca)
Date: 11/12/05
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Date: Sat, 12 Nov 2005 13:09:43 -0800 To: John Hally <JHally@epnet.com>, "'pen-test@securityfocus.com'" <pen-test@securityfocus.com>
On Apr 3, 3:10am, John Hally wrote:
}
} I need a sanity check regarding DNS ACLs. For external facing DNS servers
} you need to allow only udp/53 inbound, correct? I know tcp/53 is used for
No.
} zone transfers and requests/replies greater than a certain size, but they
} shouldn't typically happen for general dns queries correct?
Depends on the size of the query. Which in turn depends on how
your DNS is setup (i.e. do you have hosts with a large number of A
records, do you have a number of MX records {queries for these usually
return the A records as 'Additional Info'}, or have AAAA records?).
Also, don't forget about your secondaries if they happen to be
offsite.
}-- End of excerpt from John Hally
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