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| 1 - 10 of 11 in Expert Technical Advice |
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Are open recursive DNS servers inherently insecure?
06 May 2008
EXPERT ANSWER - Recursion was meant to make the Internet run better, but expert Michael Cobb explains why the willingness of malicious users to abuse this service has made it part of numerous ongoing threats.
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How to protect DNS servers
29 Feb 2008
EXPERT ANSWER - The DNS database is the world's largest distributed database, but unfortunately, DNS was not designed with security in mind. Application security expert Michael Cobb explains how to keep a DNS server from being hijacked.
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What to consider before opening a port
28 Jan 2008
EXPERT ANSWER - Recently, a reader asked network expert Mike Chapple, "What would be the security implications of opening six ports through a firewall?" Chapple reviews what questions need to be addressed before an organization exposes any ...
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Will iptables screen UDP traffic?
11 Sep 2007
EXPERT ANSWER - UDP is a connectionless protocol that can't be screened using strict stateful inspection. However, most modern firewalls, including iptables, treat UDP in the same manner as a connection-oriented protocol. Mike Chapple ...
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Troubleshooting proxy firewall connections
10 Jul 2007
TIP - In this tip, network security expert Mike Chapple explains how to diagnose client-server connectivity and security issues when a proxy firewall gets in the way.
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Can a TCP connection be made without an open port?
19 Feb 2007
EXPERT ANSWER - A company may claim it has an "application" that allows computers to communicate without opening any ports, but network security expert Mike Chapple reveals whether you should believe the hype or not. Read more in this ...
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ISA Server security don'ts
13 Dec 2005
TIP - Use this checklist of configuration don'ts to learn what to avoid when securing ISA Server.
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| 1 - 10 of 11 in Expert Technical Advice |
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