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DNS forward only: why does it help?
From: Paul Szabo <psz () maths usyd edu au>
Date: Thu, 24 Jul 2008 07:28:15 +1000
As a workaround, it is recommended to set DNS servers to forward only. Can someone explain why that helps? Cannot responses from the forwarder be spoofed same as normal query responses? Is it that "glue RRs" from forwarders are discarded; or that source ports of forwarded requests are better randomized than normal queries; or that forwarding is done with TCP not UDP? The "published attack" has ns.victim.com spoofed. That does not affect a server set to forward only. Could the attacker spoof login.victim.com directly, and would not that affect a forward only server equally? Thanks, Paul Szabo psz () maths usyd edu au http://www.maths.usyd.edu.au/u/psz/ School of Mathematics and Statistics University of Sydney Australia _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- DNS forward only: why does it help? Paul Szabo (Jul 23)