how to troubleshoot packet loss in network

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 tra

H264 video packet loss is inevitable during transmission in the group network, especially when the network environment is poor, transmission of h264 code streams, packet loss will lead to the decoding terminal screen, mosaic is se

H3C s5500 is the core and is linked to the s3100 of adjacent buildings. The user reports that the client network in 3100 is unstable. Link mode (5500) network cable (3100 MB photoelectric conversion) optical fiber to adjacent building (MB photoelectric conversion) network cable) First Ping, occasionally packet

Analysis of the causes of UDP packet loss in Linux system kernel1. UDP Checksum ErrorPhenomenon: You can use NETSTAT-SU to see that there is a UDP error packet.Tcpdump catch packet, open the captured UDP message in Wireshark, turn on checksum option, error packet.Scenario: Finding link Failure www.ahlinux.com2, Firewall OpenSymptom: A package for a specific port

Summary of delay commands for simulating packet loss in centosSummary of delay commands for simulating packet loss in linux:First, run the ifconfig command.1. Set latencyLatency: sudo tc qdisc add dev eth0 root netem delay 30 msLatency in the range (10-50 ms): sudo tc qdisc add dev eth0 root netem delay 30 ms 20 msSet

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

Production of a Linux device concurrency is relatively large, droped packet more, especially in the running game packets, there is a serious loss of packet phenomenon, suspected network card performance, in the replacement of equipment before the solution through the software method, through some data on the internet t

Troubleshoot malicious packet sending on the server On the 30th, I found that the traffic of one server in another service line of my data center was extremely high (the outbound traffic of a single server exceeds 900 MB), and the access to the server was particularly slow due to the impact of traffic on service access. We suspect that this linux server should be infected with Trojans, so we need to take em

Detailed analysis can be performed based on the SEQ sequence number and ACK sequence number of the Wireshark.Visible, the network drops (may be network congestion, it is possible that the backbone of the "firewall" intentionally randomly dropped packets, because the server's IP in foreign countries) for the network response will have a great impact.Retransmission

Solve the packet loss problem caused by repeated aix routes # netstat-rn www.2cto.com Routing tablesDestination Gateway Flags Refs Use If Exp GroupsRoute Tree for Protocol Family 2 (Internet ): default 192.168.128.254 UG 0 980 en1--=> default *. *. 2.254 UGS 3 160261 en0 --*. *. 2.0 *. *. 2.21 UHSb 0 0 en0--=> *. *. 2.0 *. *. 2.23 UHSb 0 0 en6--=> *. *. 2/24 *. *. 2.21 U 2 6040225 en0--=> *. *. 2/24 *. *. 2

The kernel has a buffer for packets to be delivered to tcpdump. IfTcpdump doesn' t respond quickly enough, the kernel will overwrite oldPackets with new ones.When tcpdump is used to capture packets, the kernel allocates a buffer to store the packets transmitted to tcpdump. If tcpdump is not processed fast enough, the newly arrived packet will overwrite the earlier packet in the buffer, that is, dropped

whether the domain-controlled DNS Set forwarding address problem, through the Discovery domain control DNS forwarding address for the Singapore address, the basic judgment is a problem, so change the forwarding address for the local ISP DNS, through the test client discovery, All resolved Baidu's IP is the mainland's Baidu server address, and the access speed and ping packets are normal.This troubleshooting let me on the domain control of some basic concepts have a deep understanding, because l

When using a mobile phone to receive mail or visit a webpage, it is generally said that there is a "packet fee" (This is the Japanese version, in China it seems generally said "traffic fee"), even if the network is not familiar with the word "packet" (here is also the case of Japan).So, what exactly is "packet"?"

). Figure 4 -When the above four steps are completed, it is easy to determine which part of the problem is the fault, and to deal with accordingly. In addition, if you want to detect the details of the network connection, you can also add-t after the Ping's address, so that you can continuously ping the connection, reflecting whether the network connection is interrupted

shown above. The network administrator will be able to troubleshoot these available processes individually. Seven, such as sometimes the network administrator can force some CPU-intensive processes to shut down, and then test whether the message loss has improved. If there is a noticeable improvement, then the cause

on the network. Therefore, the network analysis tools in the system are not a threat to the security of the local machine, but a threat to the security of other computers on the network. Tcpdump is defined as simple as possible, namely: dump the traffice on anetwork. a packet analysis tool that intercepts packets on t

you can analyze the traffic of the entire virtual network, as shown in ). Think about it. You don't have to spend a penny analyzing the virtual network. You only need to adjust the settings of a vSphere virtual switch and install a protocol analyzer on the virtual machine connected to the vSwitch. Analyze virtual networks Why do you want to analyze virtual networks? In fact, the reason for analyzing the v

The data packets formed on our network are transmitted to another database via the channel, which is generally transmitted over the network for some reasons, such as the distance is too large to produce a small number of packets are lost, and most of the packets were successfully transferred to the terminal database. In this way, a network

at a rate of Mbps, and the easiest way is to use the buffer I/O method. After the application layer completes processing, you can use either of the above two methods to submit the results to the driver. However, because I/O can only send one packet at a time, the network speed of 70% Mbps is reduced ~ 80% network speed, 10 Mbps will not be affected. That is to s

An ICMP echo Request packet is a query sent by a host or router to a specific destination host, and the machine receiving the message must send an ICMP echo reply message to the source host. This inquiry message is used to test whether the destination station is reachable and to understand its status. It should be noted that Ping is an example of a direct use of the network layer ICMP, which does not pass