Many applications are network I/O bound, including common database-based applications and service-based architectures. But operating systems and applications are often untuned to deliver high performance. This session uncovers hidden issues that lead to low network performance, and shows you how to overcome them to obtain the best network performance possible.
A small presentation about the concepts behind real-time multiplayer games and a glimpse on how to implement them with Godot Engine.
See working demo and source code: https://github.com/Faless/godotcon-multiplayer
Influence of Online Games Traffic Multiplexing and Router Buffer on Subjectiv...Jose Saldana
Jose Saldana, Julian Fernandez-Navajas, Jose Ruiz-Mas, Eduardo Viruete Navarro, Luis Casadesus, "Influence of Online Games Traffic Multiplexing and Router Buffer on Subjective Quality," in Proc. CCNC 2012- 4th IEEE International Workshop on Digital Entertainment, Networked Virtual Environments, and Creative Technology (DENVECT), pp. 482-486, Las Vegas. Jan 2012. ISBN 9781457720697
Bandwidth Efficiency Improvement for Online Games by the use of Tunneling, Co...Jose Saldana
Jose Saldana, Jenifer Murillo, Julian Fernandez-Navajas, Jose Ruiz-Mas, Jose I. Aznar, Eduardo Viruete, "Bandwidth Efficiency Improvement for Online Games by the use of Tunneling, Compressing and Multiplexing Techniques" .Proc. International Symposium on Performance Evaluation of Computer and Telecommunication Systems SPECTS 2011, pp.227-234, The Hague, Netherlands, June 2011. ISBN: 978-161-782-309-1.
Many applications are network I/O bound, including common database-based applications and service-based architectures. But operating systems and applications are often untuned to deliver high performance. This session uncovers hidden issues that lead to low network performance, and shows you how to overcome them to obtain the best network performance possible.
A small presentation about the concepts behind real-time multiplayer games and a glimpse on how to implement them with Godot Engine.
See working demo and source code: https://github.com/Faless/godotcon-multiplayer
Influence of Online Games Traffic Multiplexing and Router Buffer on Subjectiv...Jose Saldana
Jose Saldana, Julian Fernandez-Navajas, Jose Ruiz-Mas, Eduardo Viruete Navarro, Luis Casadesus, "Influence of Online Games Traffic Multiplexing and Router Buffer on Subjective Quality," in Proc. CCNC 2012- 4th IEEE International Workshop on Digital Entertainment, Networked Virtual Environments, and Creative Technology (DENVECT), pp. 482-486, Las Vegas. Jan 2012. ISBN 9781457720697
Bandwidth Efficiency Improvement for Online Games by the use of Tunneling, Co...Jose Saldana
Jose Saldana, Jenifer Murillo, Julian Fernandez-Navajas, Jose Ruiz-Mas, Jose I. Aznar, Eduardo Viruete, "Bandwidth Efficiency Improvement for Online Games by the use of Tunneling, Compressing and Multiplexing Techniques" .Proc. International Symposium on Performance Evaluation of Computer and Telecommunication Systems SPECTS 2011, pp.227-234, The Hague, Netherlands, June 2011. ISBN: 978-161-782-309-1.
Memcacheas UDP Reflectors: A Massive Amplified DDoSthe World(Attack Formulation and Mitigation) by
Muhammad Morshed Alam, AmberIT Limited.morshed@amberit.com.bd
Абстрактные обои в разных цветовых сочетаниях обладают большой эмоциональной выразительностью. Яркие сочные цвета создадут вам жизнерадостное настроение и повысят работоспособность. Абстракция будет развивать ваше мышление и воображение.
Правильно выбрав цветовую гамму, можно сделать свой рабочий стол по-настоящему красивым. Очень интересные и загадочные картинки вы можете скачать в нашей коллекции обоев
Memcacheas UDP Reflectors: A Massive Amplified DDoSthe World(Attack Formulation and Mitigation) by
Muhammad Morshed Alam, AmberIT Limited.morshed@amberit.com.bd
Абстрактные обои в разных цветовых сочетаниях обладают большой эмоциональной выразительностью. Яркие сочные цвета создадут вам жизнерадостное настроение и повысят работоспособность. Абстракция будет развивать ваше мышление и воображение.
Правильно выбрав цветовую гамму, можно сделать свой рабочий стол по-настоящему красивым. Очень интересные и загадочные картинки вы можете скачать в нашей коллекции обоев
This slideshow can be used to study twenty sight words from home or in the classroom. These words are from the Primer list. Once the student has mastered the words on this list he can move on to the next twenty words from the list. Finally, once he has mastered the Primer list he can move on to the level 1 list.
deep understanding of howto packet would reach to destination and basic understanding of network protocols.
learn howto manipulate with linux network and know howto manipulate with linux iptables.
3.7.10 Lab Use Wireshark to View Network TrafficRio Ap
Skenario soal latihan lengkap Lab 3.7.10 dari materi Cisco CCNA 1 v7. Untuk mengetahui kegunaan wireshark dalam mengcapture dan menganalisa traffic jaringan. Di skenario ini menggunakan protocol ICMP yang dipakai pada saat melakukan perintah Ping dari command line interface windows 10.
Handy Networking Tools and How to Use ThemSneha Inguva
When I joined the networking team at DigitalOcean a few years ago, I dove into an entirely different world of software-defined networking in the data center. Virtual switches, networking protocols — these were concepts that I had encountered at the surface level before — but now I frequently found myself debugging them. With time, I came to rely on a variety of Linux networking tools for introspecting, troubleshooting, and examining network state. In this talk, I’ll share some of my favorite Linux networking tools and discuss scenarios in which they are quite helpful.
If the number of spine switches were to be merely doubled, the effect of a single switch failure is halved. With 8 spine switches, the effect of a single switch failure only causes a 12% reduction in available bandwidth. So, in modern data centers, people build networks with anywhere from 4 to 32 spine switches. With a leaf-spine network, every server on the network is exactly the same distance away from all other servers – three port hops, to be precise. The benefit of this architecture is that you can just add more spines and leaves as you expand the cluster and you don't have to do any recabling. Intuition Systems will also get more predictable latency between the nodes.
As a trend, disaggregation seems to be most useful for very large companies like Facebook and Google, or cloud providers. The technology does not necessarily have significant implications for small or medium sized businesses. Historically, however, technology has a way of trickling down from the pioneering phases of existing only within large companies with tremendous resources, to becoming more standardized across the board.
Praktické postupy ochrany před DDoS útoky - Přednáška se bude zabývat postupy jak se chránit před DoS/DDoS útoky a to od nejnižší po nejvyšší vrstvu, od malých webů po korporátní sítě.
www.security-session.cz
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How is this newsletter going to help you? Apart from providing you with a brief glimpse of the test’s topics and shape, we are able to additionally assist you discover efficient education substances. Cisco’s internet site is a extraordinary starting point, but you shouldn’t restriction your self to it. Despite the fact that you would possibly have by no means heard approximately them, you have to attempt exam dumps as they may grow to be your secret tool to get a passing rating in 2 hundred-301 assessment. But now, let’s start with the exam details.
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Similar to R bernardino hand_in_assignment_week_1 (20)
1. Packet Switching, TDM and DDos
By Raul Bernardino
Introduction:
The internet infrastructure is a connection of the hardware and software of
computing around the world. In the internet communication there is a network
cores which are circuit switching and packet switching. These two components are
base for the data transmit and links throughout the networks. In the circuit
switching networks, it needs resources such as buffer, duration, and transmission
rate have to reserve along the path to make a communication between end systems.
While the packet switching networks, the resources are not reserved; it depends on
the sessions of the messages. In other words it is based on demands. This may
cause those transmit packets are in queue or waiting for the communication link to
be free for it turns. The example for circuit switching is telephone networks
whereas caller and receive the call has to establish a communication link before
exchange of the information. While packet switching example is quieting in front
of the receptions or bank cashiers, where only serve you after served others in front
line.
To have more understanding on the advantages and disadvantages of these two
network core system as follows:
a. Circuit switches argue that packet switches are not suitable with the real
time communication such as telephone calls and video-conference calls.
This argue proven with the delay in end to end system.
b. However the proponent (packet switches) argue that it better bandwidth
management, simple and more efficient, and less cost compare to circuit
switches.
To prove these two arguments above I would like take other example 1Mbps link
share with 10 users with the constant rate of 100kbps data generates and users
active time is 10%.
With circuit switches, Time Division Multiplexing (TDM), 100kbps has to divided
and reserved to each user for all the time. Assuming that 1 second frame is divided
to 10 time slot (users) then it ended with 100 mili-seconds allocate to each users
which is 1 time slot per frame. The circuit switch links only support 10 users
simultaneously. This is coming from 1Mbps=1000kbps, where 1000kbps/100kbps
= 10.
2. How about the packet switching, the probability of that specific user is 0.1 (10%).
If the there are 35 users and probability 11 users or more are using 1 Mbps
bandwidth simultaneously then the approximity 0.0004. Which means less than 10
user it will be maximize the bandwidth with.0.9996. Therefore packet switches are
refere to statistical multiplexing.
Botnet and DDoS
Bots was developed as virtual to operate in occupied machine (PS) where it is use IRC channel.
However soon after it is becoming IRC worms which effected to the PC. Later it become steal
passwords and gain financial. The bot can be seeing underground movement. It can be rented the
services to perform denial of service attack to the target computer in the remote location. If there
is large number of compromise machines it can be generated large amount of traffic on network
from email or denial services.
How it works: first botnet try to recruited computer from remote location by running malicious
software. Second organize to the target groups with the multiple similar malicious software;
however it operates with different bot herders (criminal entities) as it shows in below picture.
Picture 1.
1. Botnet send virus to the infected ordinary users
2. The bot on infected PC log into particular server
3. Send spam from purchase operator trough botnet service
4. Spammer send spam message to bot operate to compromise the machine via IRC
3. Picture 2: Internal DNS Server Lookup
Normal DNS look up process
Pictiure 3: DNS Chace poisoning
4. The steps in above picture are how DNS gets attacks.
Questions?
1. DHCP Message set over UDP
2. Discover screen shot
Offer screen shot
5. Request screen shot
Ack screen shot
Time source destination and protocol screen shot
3. The Ethernet 10.2.0 116
4.The values in the DHCP discover message is in below screen shot:
6. The value of DHCP request message is below screen shot:
5.The transaction-ID for Discover/Offer/Request/ACK in DHCP messages is oxb49697d5
The transaction-ID in the second set (Request/ACK) is oxb49697d5. The purpose of the
Transaction-ID field is to identify one packet. As it show in screen shot:
7. 6. The value of datagram are in the below screen shot:
8. 7. The IP address of your DHCP server 10.2.0.5
“C:UsersRbernardino>ipconfig/all
Windows IP Configuration
Host Name . . . . . . . . . . . . : ANPCOM312001
Primary Dns Suffix . . . . . . . : anp-tl.org
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : anp-tl.org
Mobile Broadband adapter Mobile Broadband Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
9. Description . . . . . . . . . . . : Qualcomm Gobi 2000 HS-USB Mobile Broadband device 9205
Physical Address. . . . . . . . . : 00-A0-C6-00-00-00
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter Wireless Network Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : anp-tl.org
Description . . . . . . . . . . . : Intel(R) Centrino(R) Advanced-N 6200 AGN
Physical Address. . . . . . . . . : 00-23-14-31-38-B0
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . : anp-tl.org
Description . . . . . . . . . . . : Intel(R) 82577LM Gigabit Network Connection
Physical Address. . . . . . . . . : 00-26-2D-F9-39-EE
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::b477:bc75:aa8b:d93f%14(Preferred)
IPv4 Address. . . . . . . . . . . : 10.2.0.116(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Wednesday, August 10, 2011 9:31:06 AM
Lease Expires . . . . . . . . . . : Thursday, August 11, 2011 10:43:09 AM
Default Gateway . . . . . . . . . : 10.2.0.11
DHCP Server . . . . . . . . . . . : 10.2.0.5
DHCPv6 IAID . . . . . . . . . . . : 317775601
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-15-0C-C6-AE-F0-DE-F1-22-B5-D5 “
8. IP offered from DHCP server is IPv4 Address.. . : 10.2.0.116(Preferred)
9. In the example screenshot in this assignment, there is no relay agent between the
host and the DHCP server. What values in the trace indicate the absence of a relay
agent? Is there a relay agent in your experiment? If so what is the IP address of
the agent?
10. 10. Router is the gateway where workstations can communicate to out site/in site of the network.
While subnet mask is to identify sub netting in the networks.
11. Just plug in to the network and it will be giving IP from DHCP sercer
12. the purpose of having the lease time to release automatic if the if the computer is not on
during the lease time and the IP will be giving to others who has connected to the network. In our
case is 5 days.
13. The purpose it so release the IP from the host. It is “ack” the request. If it is not ack it would
be not release the IP of the host
14. Thepurpose it to send out an Ethernet broadcast packet containing the desired
IP address. The desired host (or another system acting on its behalf) replies to the
packet by sending a packet which contains an IP address and Ethernet address pair.
This response (if any) is cached by all hosts. Cache is periodically refreshed
I used the command prompt to find the IP of the www.uol.ohecampus.com. The IP
address of the www.uol.ohecampus.com is 74.116.156.44 as show in below
captured.
“Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:UsersRbernardino>nslookup www.uol.ohecampus.com
Server: anp-tl-dil-ws01.anp-tl.org
Address: 10.2.0.5
Non-authoritative answer:
Name: www.uol.ohecampus.com
Address: 74.116.156.44
C:UsersRbernardino>nslookup
Default Server: anp-tl-dil-ws01.anp-tl.org
Address: 10.2.0.5
> set q=any