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
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?)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F319f9799-009a-4546-9417-8390624aa719%2F91f2e710-e02e-47a0-b0a6-a728d91657b8%2Fs3x8zkq_processed.jpeg&w=3840&q=75)
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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