wireshark network analysis

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Common error and analysis of Linux networkis to want to break the error and monitoring, but found that the two are almost coupled, through monitoring items to find errors, the cause of the error is also dependent on monitoring items. Simply merge the two together.For a lot of errors, in fact, even if you see the error message is not clear exactly where the error, or ambiguous, or even misleading. The best way is "Show me the Code".Here, a brief introd

application-layer encryption protocol that can perceive the structure of application-layer data and use messages as objects for signature or encrypted transmission. Unlike SSL, messages are processed as streams. SSL actively processes data streams by frame. Therefore, SHTTP can provide proof of message-based anti-denial, whereas SSL cannot. Therefore, SHTTP is more flexible and more functional than SSL, but it is more difficult to implement and use, because it is more common to use SSL-based HT

, Network_type_evdo_a, Network_type_evdo_bBoth are versions of the CDMA2000 standard, which belong to 3G, which telecom may use.7) NETWORK_TYPE_HSDPAA communication protocol, based on WCDMA, equivalent to 3.5G, Unicom may use.8) Network_type_lteThe corresponding 4G can be used by each operator.9) network_type_gsmThis value is hidden, the value is 16, and you don't know what card will appear. Conjecture should be the earliest format for the GSM standard, not verified.) NETWORK_TYPE_TD_SCDMAis als

Ipmsg.cpp's Tmsgapp::initwindow function (refer to the previous Fly Pigeon biography Source analysis article)void Tmsgapp::initwindow (void) { ... intport_no = atoi (cmdline); if (port_no = = 0) port_no = ipmsg_default_port; ... Mainwnd = new Tmainwin (nicaddr, port_no); Mainwnd->create (Class_name, ip_msg, Ws_overlappedwindow | (Isnewshell ()? ws_minimize:0));..}In the Initwindow function, you can see the initialization of the p

Article Title: Analysis of Linux system logs by network engineers. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. The important role of log files on network security cannot be underestimated, because log files can detail vari

Article title: Proxy Source Code Analysis-talk about how to learn linux network programming. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Linux is a very reliable operating system, but all friends who have used Linux will feel that a "dummies" operating system like Li

Network Framework Volley Principle Analysis, framework volley Principle Introduction: Volley is a Google Android Asynchronous Network request framework and image loading framework. Released at Google I/O 2013. Volley features: it is especially suitable for network operations with small data volumes and frequent commun

network segment, the NAT router is only used for the address segment that is governed by NAT, so 192.168.222.1 does not fall within the jurisdiction of this Gateway.So the host wants to pass 192.168.222.1 this network card to reach the NAT server is not feasible.Conclusion:From the routing table, the host principle packet can reach 192.168.222.2 this gateway, but this gateway does not give a reply, because

Performance testing-Network Environment Analysis First, we need to understand the concept of the network bandwidth environment for broadband access: This refers to the unit calculation method and relationship of bandwidth network speed. In computer networks and IDCs, the unit of bandwidth rate is expressed in BPS (o

interface qg-b8b32a88-03 of the router connection, a source NAT is made, and the packet's origin address is modified to router's interface address 10.10.10.2, so that the destination can send the reply packet back to router , and then forward back to the source-side instance.You can view SNAT's rules through the iptables command.When CIRROS-VM3 (172.16.101.3) pings 10.10.10.1, it is possible to verify router behavior by observing interface two SNAT ICMP packets by tcpdump respectively.vlan101 i

In front of a lot of about CPU and memory analysis, that in Linux, how to view the local network related to the situation. Use: Netstat Netstat is a program that accesses the network and related information in the kernel., generally used to verify the network connectivity of the local ports, it can provide TCP connecti

In the NETIF_RECEIVE_SKB () function, you can see that processing is like ARP, IP these link layer above the protocol, then, the link layer header is where to remove it. The answer is in the NIC driver, before calling NETIF_RECEIVE_SKB (), Related reading: Linux Kernel Analysis-network [a]: send and receive packet calls Http://www.linuxidc.com/Linux/2011-05/36063.htm Linux Kernel

channel, balances the coverage of the channel, reduces the gain of the base station antenna, adjusts the azimuth angle of the base station antenna, and reduces the coverage area of the residential area, to reduce uplink interference, but this may also cause coverage problems in other regions. A new base station or direct release station is built to solve the problem. Ii. CDMA wireless network capacity optimization The capacity optimization of mobile

from other regions to R10 through eBGP. By default, the main factor affecting R10 routing is the RID. In this topology, r10 always selects R8 as the next hop to the external Region Now consider the route from AS 65101, from the topology we can find that the path from R9 to AS 65101 is R9-R3, and the path from R8 to AS 65101 is R8-R6-R4-R3 The solution here is that when R8 and R9 notify AS 65103 of the update, the internal network of AS 65100 should

[Email protected] ~]# Vim/etc/yum.repos.d/ntop.repo[NTOP]Name=ntop Packagesbaseurl=http://packages.ntop.org/centos-stable/$releasever/$basearch/Enabled=1Gpgcheck=1Gpgkey=http://packages.ntop.org/centos-stable/rpm-gpg-key-deri[Ntop-noarch]Name=ntop Packagesbaseurl=http://packages.ntop.org/centos-stable/$releasever/noarch/Enabled=1Gpgcheck=1Gpgkey=http://packages.ntop.org/centos-stable/rpm-gpg-key-deri2. Install the Yum extension source[Email protected] ~]# RPM-UVH epel-release-6-8.noarch.rpm3, In

to form virtual workgroups to dynamically manage the network. using VLAN technology can divide multiple network segments and effectively solve the problem of interfaces. Its technical advantage is that it can limit the broadcast on the network.Point-to-Point protocol PPP is a kind of link layer protocol that provides network layer packets on a point-to-point lin

Complete analysis of android Network Application Development Zookeeper Android network application development mainly involves two methods: socket (encapsulation of tcp/udp Protocol) and Http protocol, android provides two methods: HttpURLConnection and Apache HttpClient. This section describes Android network applicat

Network traffic is an important indicator for network administrators. Observe the traffic to learn the newest symptoms of the network. Here is the Mrtg tutorial for installing the network traffic statistical analysis tool MRTG. Mrtg tutorial By SeeLinux Installing

In-depth analysis of network latency during Android boot In general, the property of phone is persistent to true, and the phone process is called up earlier. Applications modified by android: presistent will be started by AM after the system is started, even if they are not running, AM also calls startProcessLocked to start the process. Start package com. android. phone, that is, phone application. This wil