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DNS servers also allow reverse lookup; given an IP address 128.112.169.4, it is reversed into a text string 4.169.112.128.in addr.arpa and looked up using DNS PTR records (which form a hierarchy of domains analogous to that for the address domain Hierarchy). Suppose you want to authenticate the sender of a packet based on its host name and are confident that the source IP address is genuine. Explain the insecurity in converting

DNS servers also allow reverse lookup; given an IP address 128.112.169.4, it is reversed into a text string 4.169.112.128.in addr.arpa and looked up using DNS PTR records (which form a hierarchy of domains analogous to that for the address domain Hierarchy). Suppose you want to authenticate the sender of a packet based on its host name and are confident that the source IP address is genuine. Explain the insecurity in converting

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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DNS servers also allow reverse lookup; given an IP address 128.112.169.4, it is reversed into a text string 4.169.112.128.in addr.arpa and looked up using DNS PTR records (which form a hierarchy of domains analogous to that for the address domain Hierarchy). Suppose you want to authenticate the sender of a packet based on its host name and are confident that the source IP address is genuine. Explain the insecurity in converting the source address to a name as above and then comparing this name to a given list of trusted hosts. (Hint: Whose DNS servers would you be trusting?)
Transcribed Image Text:DNS servers also allow reverse lookup; given an IP address 128.112.169.4, it is reversed into a text string 4.169.112.128.in addr.arpa and looked up using DNS PTR records (which form a hierarchy of domains analogous to that for the address domain Hierarchy). Suppose you want to authenticate the sender of a packet based on its host name and are confident that the source IP address is genuine. Explain the insecurity in converting the source address to a name as above and then comparing this name to a given list of trusted hosts. (Hint: Whose DNS servers would you be trusting?)
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