simulate packet loss

whether there is any traffic exception. Network Traffic Analysis Process 1. Overall Network Traffic Monitoring We first use the History Samples historical sampling function of Sniffer Pro to monitor the network utilization on the image link. The following results are obtained: Link to utilization The link actually transmits numbers per second. From the above monitoring results, we can see that in every 40 seconds, the network traffic in this link will peak for 15 seconds, and it is very reg

to the client to perform network debugging two months ago. Its Internet cafe covers an area of more than seven hundred square meters and has 120 machines. It is equipped with a dedicated data center and is equipped with switches and servers. I took my laptop to its dedicated data center. The first step was to test the telecom terminal, connect the portable device to the photoelectric converter, configure the portable device with an IP address, ping the telecom DNS, and then call the data center

Cause Analysis of UDP packet loss in linux kernel 1. UDP checksum and error phenomenon: you can use netstat-su to view UDP error packets. Tcpdump packet capture: enable the captured udp packet in wireshark and enable the checksum option. Solution: Find Link faults www.2cto. com2, firewall... cause analysis of UDP

# throughput = byte CNT/Time Interval # Time Interval = cur_time-start_timebegin {# program initializeinit = 0; I = 0 ;} {Action = $1; time = $2; from = $3; To = $4; type = $5; pktsize = $6; flow_id = $8; src = $9; DST = $10; seq_no = $11; packet_id = $12; if (Action = "R" from = 2 to = 3 flow_id = 2) {pkt_byte_sum [I + 1] = pkt_byte_sum [I] + pktsize; If (init = 0) {start_time = time; init = 1;} end_time [I] = time; I = I + 1 ;}}end {# when read over, start to calculateprintf ("%. 2f \ t %.

By the 3 (in fact, 2) the problem of the pit miserable, there is no problem of missing packets, previously thought that the problem of packet loss is not present.The case of sticky and broken packets is present, these two problems are not afraid, as long as the sending received packet order is not disrupted upside down, everything is good.Easy-to-drop pits: Accep

http://view.inews.qq.com/a/20161025A0766200QQ in narrowband eraQQ is a narrow band of the most representative of the product, in that network transmission efficiency is lower than the era, we still remember Google's homepage? Why is the simple page of Google so concise?Google was born in 1998, is also in the narrow-band era, you will find its home byte size is less than 1024, why less than 1024 bytes, because the Ethernet MTU (that is, the largest transmission unit) is 1024,google in order to le

Today in the company asked the boss, the company's project Bottom, is the use of TCP, because of reliable, automatic disconnection, in the bottom of the implementation, but I remember TCP will also have a swap problem, so this article was born--on the problem of TCP swap, TCP is based on unreliable networks to achieve reliable transmission, There is certainly a case for the substitution.If there is missing data or drops in the communication, the most likely problem is the process of sending the

The performance of the test system in Linux has found that the packet loss rate is extremely serious. It sends 210000 pieces of data, and the packet loss rate reaches 110000. The packet loss rate exceeds 50%. In the same case, onl

Analysis on network packet loss caused by full tracking of ip_conntrack connections When the access volume of our online web server is very large, packet loss occurs during network connection. You can view the log by running the dmesg command and find the following information: kernel:ip_conntrack:tablefull,droppingpac

Summary Packet loss occurs when we use ping to check whether a system can run normally. packet loss occurs in the channel for various reasons. Ping uses ICMP send-back request and send-back response packets. An ICMP return request message is a request sent from a host or router to a specific target host. The machine

Clone Zabbix's own template ICMP ping templates 650) this.width=650; "Src=" Http://s5.51cto.com/wyfs02/M01/86/F3/wKioL1fPrcLi2YxjAAByYarcCOM203.jpg-wh_500x0-wm_3 -wmp_4-s_2806794333.jpg "title=" ping 202.96.209.5.jpg "alt=" Wkiol1fprcli2yxjaabyyarccom203.jpg-wh_50 "/>Here I make a network delay template to 202.96.209.5 Shanghai DNS650) this.width=650; "Src=" Http://s3.51cto.com/wyfs02/M02/86/F3/wKioL1fPrnnS2DkyAACNTuKAcik725.jpg-wh_500x0-wm_3 -wmp_4-s_2264462392.jpg "title=" qq2016090714062

Cause Analysis of UDP packet loss in linux kernel 1. UDP checksum and error phenomenon: You can use netstat-su to view UDP error packets. Tcpdump packet capture: Enable the captured udp packet in wireshark and enable the checksum option. Solution: Search for Link faults www.2cto.com 2. Firewall enabling phenomenon: pac

the connection, The connection pool considers the connection to be valid (because the validity of the connection is not verified), which results in an error when the application requests the connection. 3. Workaround: A. Follow the wrong prompts, you can use the AutoReConnect property in the JDBC URL, here is my configuration Jdbc:mysql://localhost:3306/anxincar? autoreconnect=true Where the red part is the newly added property settingHowever, there is another version of the Internet, it has be

One, bandwidth estimationTCP bandwidth estimation is mainly implemented by the congestion control algorithm, which uses two variables:1, CWnd TCP estimation of the current link available bandwidth2, Ssthreash congestion control algorithm "hypothetical" out of the available bandwidth valueSecond, packet loss recoveryThere are three cases of packet

1 Try {2 //send data to the specified IP and port ~ ~ 3 //let's explain who sent the data! 4 byte[] IP =inetaddress.getlocalhost (). Gethostaddress (). GetBytes ();5DP =Newdatagrampacket (IP, ip.length, Sendiad, Qqreceive.getport ());6 Ds.send (DP);7 8 //this is mainly due to the fact that multiple datagram packets are sent when the pa