Non-Fragmented Network Flow Design Analysis: Comparison IPv4 with IPv6 Using Path MTU Discovery
Round 1
Reviewer 1 Report
This paper demonstrates the effectiveness of IPv6 path MTU discovery in a virtual environment. The original contribution of this paper is not obvious, compared with the related work in [4]-[17].
The writing is not rigorous. For example, the references format in [5]-[7] and [9]-[11] is not correct, and the fig.1 and fif.2 are the same.
Author Response
Response to Reviewer 1 Comments
Point 1: The original contribution of this paper is not obvious, compared with the related work in [4]-[17].
Response 1: We are grateful for your observations, and we consider it necessary to mention in our paper the originality of comparison in performance terms between IPv4 and IPv6 in the face of Path MTU Discovery Protocol application to reinforce the non-existence of papers exactly equals in methodological terms. We add on text (lines 50-53) one paragraph to explain (concerning Section 2 - Related Work) that the cited papers contain similar experiments (references 4-17) but not exactly a comparison between IPv4 and IPv6 making use of Path MTU Discovery Protocol. Besides that, to make "Section 1 - Introduction" more proper, we add (lines 41-46) one paragraph with the contribution of our paper. We expect that made changes appropriate to meet your expectations.
Point 2: The writing is not rigorous. For example, the references format in [5]-[7] and [9]-[11] is not correct, and the fig.1 and fif.2 are the same.
Response 2: References 5, 6, 7, 9, 10 e 11 were standardized according to your observation. About duplicity of Figures 1 and 2, there was an error, and the problem has been corrected. We add the correct Figure with IPv6 addresses.
*The modified article is attached in pdf
Author Response File: 
Author Response.pdf
Reviewer 2 Report
SUMMARY:
In this paper the authors presented the results of their experiments, comparing the IPv4
and IPv6 protocols. The authors wanted to highlight a great feature of IPv6, the Path MTU Discovery,
which is used in order to compensate for the absence of fragmentation that exists in IPv4 protocol.
The authors present their experimental setup and describe properly the process of their test and
the collection of results.
Although overall the article had a proper structure, and short sentences were used which generally help the reader,
it was difficult for the reader to follow the authors as there were many occasions that the sentences did not make any sense.
The authors must review their paper and rephrase a big part of it, as unfortunately, grammar errors are frequent and
cause comprehension issues.
Regarding the results of their experiment, it is not perfectly clear how much better is the Path MTU Discovery
of the IPv6 comparing to the fragmentation of IPv4. It would help a lot if the Figures 3 to 7 have units
in the vertical axis; It was not easy to correlate the results presented in the figures, with the results that were presented in their conclusion.
ERRATA - SUGGESTIONS:
Figure 1 and Figure 2 show the same IP addresses, although figure 2 is supposed to present IPv6 addresses
Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, "em" must be replaced with "in"
Author Response
Response to Reviewer 2 Comments
Point 1: Although overall the article had a proper structure, and short sentences were used which generally help the reader, it was difficult for the reader to follow the authors as there were many occasions that the sentences did not make any sense. The authors must review their paper and rephrase a big part of it, as unfortunately, grammar errors are frequent and cause comprehension issues.
Response 1: We are grateful for your observations, and we consider it necessary to have detailed corrections in our text's grammar and comprehension issues. All our paper has been revised following English Language norms by a researcher from our lab who is fluent in your language. We expect that made changes appropriate to meet your expectations.
Point 2: Regarding the results of their experiment, it is not perfectly clear how much better is the Path MTU Discovery of the IPv6 comparing to the fragmentation of IPv4. It would help a lot if the Figures 3 to 7 have units in the vertical axis; It was not easy to correlate the results presented in the figures, with the results that were presented in their conclusion.
Response 2: Thank you very much for your comments again. Figure 07 (that is the most critical Figure in the context of a comparison between the different presented scenarios) did not contain the appropriate information. All Figures have been reconstructed to highlight the units meaning on the x/y axis. Figure 7 has reconstructed to emphasize that when Path MTU Discovery Protocol is applied, there is stabilization on Jitter and Bandwidth regardless of the existence of different MTU values across the network. Another way to validate this fact is by observing the Bandwidth decrease and Jitter increase on different IPv4 scenarios (that is, where there is no Path MTU Discovery Protocol applied).
Point 3: Figure 1 and Figure 2 show the same IP addresses, although figure 2 is supposed to present IPv6 addresses Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, "em" must be replaced with "in".
Response 3: Figure 2 was incorrect. We add the correct Figure with IPv6 addresses. Figures 3-7 have been redone changing "em" by "in." We expect that made changes appropriate to meet your expectations.
*The modified article is attached in pdf
Author Response File: Author Response.pdf
Reviewer 3 Report
The authors present the results obtained by performing fivesimulation tests in order to verify the superiority of the IPv6 protocol
over the IPv4 protocol when working in the virtual environment.
The results obtained are convincing. The paper is well written.
Author Response
Dear reviewer, thank you for feedback.
Round 2
Reviewer 1 Report
This paper demonstrates the effectiveness of IPv6 path MTU discovery in a virtual environment. The test situations are simple and the effects with respect to virtual environment is not given. Compared with other test methods in other papers [4-17], the original contribution of this paper is low.
Reviewer 2 Report
The article modifications have improved the
paper quality for publication
