Homework Help is Here – Start Your Trial Now!
Engineering
Computer Science
If a UDP datagram is sent from host A, port P to host B, port Q, but at host B there is no process listening to port Q, then B is to send back an ICMP Port Unreachable message to A. Like all ICMP messages, this is addressed to A as a whole, not to port P on A. (a)  Give an example of when an application might want to receive such ICMP messages. (b)  Find out what an application has to do, on the operating system of your choice, to receive such messages. (c)  Why might it not be a good idea to send such messages directly back to the originating port P on A?

If a UDP datagram is sent from host A, port P to host B, port Q, but at host B there is no process listening to port Q, then B is to send back an ICMP Port Unreachable message to A. Like all ICMP messages, this is addressed to A as a whole, not to port P on A. (a)  Give an example of when an application might want to receive such ICMP messages. (b)  Find out what an application has to do, on the operating system of your choice, to receive such messages. (c)  Why might it not be a good idea to send such messages directly back to the originating port P on A?

Systems Architecture
Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter13: Internet And Distributed Application Services
Section: Chapter Questions
Problem 15VE
See similar textbooks
icon
Related questions
Question

If a UDP datagram is sent from host A, port P to host B, port Q, but at host B there is no process listening to port Q, then B is to send back an ICMP Port Unreachable message to A. Like all ICMP messages, this is addressed to A as a whole, not to port P on A.

(a)  Give an example of when an application might want to receive such ICMP messages.

(b)  Find out what an application has to do, on the operating system of your choice, to receive such messages.

(c)  Why might it not be a good idea to send such messages directly back to the originating port P on A?

 

Expert Solution
steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Recommended textbooks for you
Systems Architecture
Systems Architecture
Computer Science
ISBN:
9781305080195
Author:
Stephen D. Burd
Publisher:
Cengage Learning
A+ Guide To It Technical Support
A+ Guide To It Technical Support
Computer Science
ISBN:
9780357108291
Author:
ANDREWS, Jean.
Publisher:
Cengage,
Principles of Information Security (MindTap Cours…
Principles of Information Security (MindTap Cours…
Computer Science
ISBN:
9781337102063
Author:
Michael E. Whitman, Herbert J. Mattord
Publisher:
Cengage Learning
Comptia A+ Core 1 Exam: Guide To Computing Infras…
Comptia A+ Core 1 Exam: Guide To Computing Infras…
Computer Science
ISBN:
9780357108376
Author:
Jean Andrews, Joy Dark, Jill West
Publisher:
Cengage Learning
Np Ms Office 365/Excel 2016 I Ntermed
Np Ms Office 365/Excel 2016 I Ntermed
Computer Science
ISBN:
9781337508841
Author:
Carey
Publisher:
Cengage
A+ Guide to Hardware (Standalone Book) (MindTap C…
A+ Guide to Hardware (Standalone Book) (MindTap C…
Computer Science
ISBN:
9781305266452
Author:
Jean Andrews
Publisher:
Cengage Learning
SEE MORE TEXTBOOKS