Network Administration - Science topic

David Lide Yeah but what are the protocols used to read those data. For an example FLPs are used to do auto negotiation. Like wise how are the other things are read or managed by the NIC?

Hi! Just stumbled upon this thread while looking for other related issue. Hope this helps:

Zahid, I believe this article addresses the tradeoffs really well:

Distance vector protocols are simpler to understand and simpler to configure, but they are limited in the size of networks they will accommodate and the take longer to converge, compared with link state.

Check the following reference Please.. it might's assist you in your question …

Many thanks to both of you! I've really appreciated your helps!

Thank for these answers it is useful 

Hi,

Are you talking about prioritizing Network Management Functions, or ranking industrial products (NMS)?

In the latter case, I am not aware of such studies, but maybe you might be willing having a look at the results of the European Network of Excellence Flamingo focusing on Network and Service Management.

Some good piece of information is available.

LENA project provided by CTTC

I have solved this problem.

Packet losses can happen due to your physical medium channel (copper cable, radio link, optical fiber), network equipments malfunction/configuration, network topology or QOS, or be related with one or both of your network endpoints (which includes network stack, protocols, etc). And these packets are really losses, which means that the packet information get lost at some point and the receiver never receives it.

But you may be experiencing another type of "packet loss" which can be caused by wireshark (or other capturing tool) itself and it is usually called "dropped packets". This type of loss is shown in the wireshark status bar, alongside with the number of packets captured, displayed and marked statistics. PLEASE NOTE that this information is only displayed if Wireshark was unable to capture all packets [refer to https://www.wireshark.org/docs/wsug_html_chunked/ChUseStatusbarSection.html ], which allows you to immediately infer if this is your situation. Please note also that this metric IS NOT SAVED in your pcapng files; you can see it - if it occurs - while capturing or even after you stop the capture process but still displaying the capture in the wireshark; even if you save that capture, once you close it, you will not see this metric again.

This type of packet loss relates with the performance of the capturing system, usually due to your hard drive read/write rate and overall system load. What happens in this situation is that wireshark was able to detect one or more packets in the capture network interface, but due to the low performance, it could not save the related packet information, so the capture algorithm chooses to drop that packet(s). There are some tricks you can follow to minimize (not avoid!) the low performance impact, which are explained in the "optimized Wireshark settings" section, https://wiki.wireshark.org/Performance . Note also, that the operating system has an important role in the performance; some time ago, while facing some problems related to this, I discover that the number of packets dropped by wireshark on Linux was (much!) less while capturing with Wireshark on Windows - what was not really a surprise for me. Notice that the performance issue can also happen with other software tools. I will assume that you are not generating network traffic in the same capture system, because this negatively influences the performance too.

If you are dealing with optical fiber links, I advise you to - if possible - forget wireshark or similar software tools and use instead a dedicated network performance measure equipment. These kind of equipments usually have dedicated high performance hardware, like FPGAs, that will allow you to generate all kind of network traffic and get almost all measures and statistics you may desire or need.

From my personal experience, considering a I7 Quad Processor, with 16GB RAM but a mechanical 5400rpm or 7200rpm HDD, when considering a large number of packets, from time to time - say 1 in 10/15 times - I was facing dropped packets even on a 1Gbps ethernet link. The problem was more notorious as the number of packets increases (typically for < 1 million packets it were dropped less than 1k packets but for 9 M, the number of dropped packets increases to 3M easily!). Although I successfully reduced the number of packets dropped, I could not avoid the problem because from time to time, I still get some dropped packets, which do not allow me to have 100% confidence in my measures.

Since at the beginning I have no access to a dedicated Network Performance measure hardware, I developed a simple measure system based on FPGA that allow me to despite this problem and prove the correct system function.

I hope that this information can help you.

I suggest to use the first techniques.

Please refer to this study. It may help you to sort out the problem

sorry I do not have the expertise to answer this question.

Based on my experience as a network research-based student, configuring the network layer quite difficult particularly for the beginners that are practicing "trial and error" practices. If the configuration success, it is a luck for them. However, if it is not success, they will search for another methods or commands (mostly ask for Google's help).

Just refer to the classical MUSIC algorithm and apply it in your case of superimposed signals with different frequencies.

Find attached the MUSIC algorithm.

Go to my page and read my paper. you will get the different parameters which are very much related to interconnection networks.

Remote attestation based on trusted computing supports detecting changes of the remote software.

If you want to send this kind of messages at MAC level could be difficult, at least you can do it, keeping the original address on the network layer address or just modifying the contikimac, to keep the original source address and modifying the rest of the message, then, when your mote 3 receives the packet and decipher it, the remaining information at MAC level will be from the mote 1 instead of mote 2.

Regards,

Francisco

Hello Olumuyiwa Emmanuel Ibidunmoye ,

I am not sure whether this would be helpful or not.

How about this command ?

xm vcpu-list

-Srikrishnan

Han Ping Fung has explained almost everything. I do agree.

Hello there if you have perform some experiment with DDoS in cloud. Can u help me with materials as I am new to this and have to do my Mtech thesis on the same It will be appreciating if you can help me through it as I dont know how to Implement DDoS on cloud

Penetration testing tools are used to automate several tasks in order to improve testing performance and identify those security issues, which are harder to discover with manual testing analysis approaches. There are two general types of penetration testing tools: static and dynamic analysis. These both kind of tools are used with veracode to determine security susceptibilities. In addition, veracode’s binary scanning methodology is more accurate and result oriented that controls the false positive. The veracode can help small to large types of organization for handling the security risk. The penetration testing should be set in such a way to control the weak and vulnerable points of environment within the organization. The goal of incorporating penetration testing is the only way to secure the cyber-attacks and hacking.

So, the appropriate option is to make suitable change with Firewall and incorporate the penetration test features that can automate the testing process for security enhancement. The second option for automation of penetration testing is to employ with intrusion detection system (IDS) for handling the false positive. But I think Veracode-Platform does this function automatically.