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Article Title: design a Secure Linux network. 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. As a system, its security should be carefully considered when planning the
to the security of the local machine, but a threat to the security of other computers on the network. Installation of network data collection and analysis tool TcpDump In linux, the installation of tcpdump is very simple. Generally, there are two installation methods. An rpm Package is used for installation. In addition, it is installed in the form of a source
the security of the local machine, but a threat to the security of other computers on the network. Installation of network data collection and analysis tool TcpDump In linux, the installation of tcpdump is very simple. Generally, there are two installation methods. An rpm Package is used for installation. In addition, it is installed in the form of a source prog
destination. This process is calledRoute. The post office connects the separated Local Area Network to the Internet and eventually formsGlobal coverageInternet. Transport Layer) The preceding layer-3 protocol allows different computers to communicate with each other. But there are actually manyProcess, Each process can have communication requirements (see Linux Process basics and
; Condition 2: The underlying driver supports setting the hardware address of a device so that there is always a slave (curr_active_slave) using the hardware address of bond, while ensuring that slave in each bond has a unique hardware address. If the curr_active_slave fails, its hardware address will be taken over by the newly elected Curr_active_slave. in fact, the difference between mod=6 and mod=0 : mod=6, the first eth0 flow accounted for, and then accounted for eth1,....ethx, and
network;(4) The MAC module notifies the DMA module to fetch data;(5) The DMA module pulls the appropriate BD from the BD table;(6) The MAC module sends the data to the current BD corresponding cache;(7) The network device notifies the processor to start receiving data (in the form of interrupts or polling);(8) The protocol layer takes the data out of the current BD cache.The steps (3) ~ (6) are hardware au
addition, the security authentication methods of these service programs are also vulnerable to "intermediate servers ".. Here I will list some unsafe commands according to the hazard level, as shown in Table 3. Currently, ftp and telnet can be bound to port 22 by using SSH commands.RSA encryption. After the authentication is complete, all subsequent traffic is encrypted using IDEA. SSH (SecureShell) the program can log on to the remote host over the
according to the user's definition. As a necessary tool for the classic system administrator on the internet, tcpdump, with its powerful functions and flexible interception policies, becomes one of the essential tasks for every senior system administrator to analyze the network and troubleshoot problems. Tcpdump provides source code and open interfaces, so it has high scalability and is a very useful tool for net
With the increasing popularity of Linux applications, a large number of network servers use the Linux operating system. To fully measure the network running status, you need to make more detailed and accurate measurements on the network status. The establishment of the SNMP
competitive reading will have a certain performance loss. The principle of multi-process competitive reading is as follows:The So_reuseport solves 2 problems of multi-process read-write with one-port scenario: Load balancing and access contention. With this option, multiple user processes/threads can each create a separate socket, but they share the same port, and the traffic on that port is distributed by default in a four-tuple hash of each socket
Ifstat Introduced Ifstat tool is a network interface monitoring tool, relatively simple to see network traffic Instance Default use #ifstatEth0 eth1KB/S in kb/s out kb/s in kb/s out0.07 0.20 0.00 0.000.07 0.15 0.58 0.00 The default ifstat does not monitor the loopback interface, which shows the unit of traffic is
An in-depth understanding of Linux Network Technology-Virtual Device initialization summary and a deep understanding of linuxOverview a virtual device is an abstraction built on one or more real devices. There are many to many mappings between virtual devices and real devices, but not all combinations can be defined or supported by the kernel.The following lists some common Virtual Devices: Bonding // bindi
1 Introduction to Analog delay transferNetem and Tc:netem are a network emulation function module provided by Linux 2.6 and above kernel versions. The 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 of Linux with
Some Linux network tools you may not know If you want to monitor the network on your system, it is very practical to use the command line tool. For Linux users, there are many ready-made tools available, such as nethogs, ntopng, nload, iftop, iptraf, bmon, slurm, tcptrack, cbm, netwatch, collectl, trafshow, cacti, ethe
Linux Advanced Programming --BSD Socket of network programmingPurpose: The learning of technology is limited, the spirit of sharing is unlimited.a Fundamentals of network communicationTCP/IP Protocol Cluster Foundation: TCP/IP is a protocol cluster, because TCP-IP includes TCP, IPS, UDP, ICMP and many other protocols. Is the comparison between the OSI model and
Network Packet Troubleshooting Guide-class Linux platform background informationI've been testing k8s recently, and if you know or get in touch with Docker, you know that most of the networks associated with Docker are on bridging, routing, Iptables. If you happen to have contact with k8s, and understand the principle behind it, you must know that Kube-proxy iptables play to fly up. Of course, you may think
The Linux operating system is stable, robust, efficient, and secure. Is becoming an ideal platform for various network services. Various network applications have superior performance applications in the Linux system, such as Apache servers providing Web services, Bind of DNS services, and Postfix, Sendmail, and Qmail
/resolve.confnslookupnslookup non-interactive query (ns SOA mx any) nslookup-type=?nslookup-q=? Nslookup interactive query requires Setnslookupset type=?set q=?baidu.com nslookup-type=ptr 8.8.8.8nslookup www.qq.com 8.8.8.8nslookup-de Bug www.qq.comDigDig baidu.com nsdig baidu.com soadig baidu.com mxdig-x 8.8.8.8-x find PTR records dig @8.8.8.8 www.qq.com @IP Specify DNS query dig www . qq.com a +trace DNS query tracking dig @ns1. youku.com youku.com A
18 Common commands for monitoring network bandwidth on a Linux serverThis article describes some of the Linux command-line tools that you can use to monitor network usage. These tools can monitor data transmitted over a network interface and measure the speed at which data i
in the embedded development, we often use a variety of Linux commands, today and everyone to share is the basic Linux Network command, which is inadvertently seen on the internet in a well-organized article, to share to everyone, I hope to help everyone. The most important and basic Linux
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