traceroute packet loss

Reprint: http://blog.csdn.net/galaxy_fxstar/article/details/5290498 Recently with tcpdump grab bag, found that there are a large number of drops ("packets dropped by kernel"), As follows: Tcpdump-i eth0 DST Port 1234 and udp-s 2048-x-tt >a.pack Packets Captured3043 Packets received by filter2706 packets dropped by kernel Packet Drop Reason: After Google and analysis, the cause of this drop is due to the libcap caught

Recently, my company thought it was a network problem or a data center problem when a packet loss problem occurred on its website. after a long time of troubleshooting, I found that the linux network card was out of the package. Let's share my solution. In the past, the company's system often experienced packet loss du

Compile and install the NIC Driver in linux (NIC packet loss)-Linux Enterprise Application-Linux server application information. The following is a detailed description. Install and compile the NIC Driver In the past two days, I found that the packet loss of a server is very serious. The snmp package can be obtained wh

Let's start by recognizing what a packet loss is, and what kind of phenomenon is being lost to the network: Data is transmitted on the Internet on a packet-by-unit basis, with a packet of NK, no more, no less. That is to say, no matter how good the network line is, how strong the network equipment, your da

Previously, we talked about libpcap packet capture, especially in the case of a gigabit network, which results in a large number of packet loss and a long time of searching on the Internet. This is probably a method like PF_PACKET + MMAP, NAPI, and PF_RING, I tested PF_RING + libpcap and found that the packet capture p

lower layer. If pending is returned, release our mypacket in ptsendcomplete; otherwise, the mypacket will be released immediately in this function. 3. When the lower-level miniport driver sends mypacket, it will call ndismsendcomplete 4. NDIS then calls passthru's ptsendcomplete. In this function, we should release mypacket and notify the upper-layer protocol driver to release their packet. Packet

1 Introduction to Analog delay transmission Netem and Tc:netem are a network emulation module provided by the Linux kernel version 2.6 and above. This function module can be used to simulate complex Internet transmission performance in a well performing LAN, such as low bandwidth, transmission delay, packet loss, and so on. Many distributions Linux that use the Linux 2.6 (or above) version of the kernel fea

LibPcap packet loss problem-Linux Enterprise Application-Linux server application information. The following is a detailed description. Author: Yu Zhu During this time, we checked the high packet loss rate of LibPcap. Many people mentioned this on the internet, but they always suspect that their problems are different

The out-of-order and packet loss of Java Datagram-general Linux technology-Linux programming and kernel information. The following is a detailed description. Accustomed to TCP programming, it is wrong to think that UDP can handle these problems. A udp application must take full responsibility for reliability, including 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

Resolve network packet loss problems in linuxRecently, I encountered problems in my business. I found that the value of overruns is constantly increasing. I learned some related knowledge.It is found that the number is constantly increasing. G, I found that the meanings of these errors, dropped, and overruns are not the same.Eth2 Link encap: Ethernet HWaddr 00: 8C: FA: F1: DA: 78Inet addr: 10.249.2.112 Bcas

, we set the maximum limit of 4,096, is the driver inside each receive a batch of packets, it will ixgbe_alloc_rx_buffers assign a batch of new SKB and pagePCI_DMA mapping to the hardware to collect packetsHere the first Tasklet dispatch to CPU1, cpu2 the problem can be explained, the VM packet triggered the network card cpu1, cpu2 on the interruption, until soft interrupt, KFREE_SKB, Trigger Idx_release, then tasklet_schedule, then TX _action has bee

connection without packet loss. Then, I directly access and operate the sales system on the workstation in the Central Data Center. Everything is normal, it indicates that the network of the sales server and the central data center is normal. Is there a network problem at the sales office? Try to restart the switch at the sales office and test that the fault still exists.Are all computers in the sales offi

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

Problem DescriptionWhen you use a vro to access the Internet, the network speed is slow or unstable, and packet loss occurs on the ping Internet, as shown in the figure below:Ping packet loss is generally caused by physical connection quality or line congestion. We will analyze and troubleshoot the factors that are mos

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

This article mainly uses an example to explain in detail how to solve the packet loss problem caused by CISCO router faults? The following article gives me a detailed answer. Recently, some people in my department (Department A) reported that they could not access the network of the higher-level department (Department B. I use the ping command from the computer A1 (IP Address: 10.20.12.11/24) used by this p

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 serious, this cutting-edge technology is FEC, NACK, the former is the forward correction tec

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