This article explains the function of DNS protection under Proxy Options.
Scope
FortiProxy
Solution
DNS protection on FortiProxy provides protection against DNS poisoning.
The feature is available under Proxy Options:
During transparent proxy deployment, every client performs DNS lookup to get servers IPs by themselves. However, DNS server settings cannot be controlled on every client. Some may use a compromised DNS server, which can forward connections to illegitimate IPs instead of the intended IP, creating a security compromise risk.
Enabling DNS Protection gives FortiProxy the ability to verify each server’s IP is legitimate by comparing domains with its own DNS lookup results. If the results do not match, FortiProxy will make a request to the server’s IP from its own DNS lookup.
Explicit proxy deployment does not carry this risk because every DNS lookup is performed by a proxy server which is configured to use only a trusted DNS server.
Alex Lim
Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook
