By default, Windows opens many service ports on your computer. Hackers often use these ports to intrude. Therefore, mastering port knowledge is essential for secure Internet access.
I. Common ports and their classification
Computers need to use the TCP/IP protocol to communicate with each other over the Internet. According to the TCP/IP protocol, the computer has 256x256 (65536) ports, these ports can be divided into TCP
The single chip microcomputer multi-byte serial port receive (high-order research of serial port multi-byte receive send)Original address: Http://bbs.ednchina.com/BLOG_ARTICLE_3007162.HTMWork for more than a year, wrote a lot of single-chip computer serial program. The sense of the serial port multi-byte receive part of the logic relative to the configuration reg
0. PrefaceNC is a good tool for both ends of the network connection, but also a temporary port forwarding. (What is the permanent port forwarding?) With Iptables)SSH is also a good tool in this area, the advantage is that encryption is reliable reusable at one end of the operation, at the cost of having a login account.We know that SSH automatically encrypts and decrypts all network data between the SSH cli
Modify the ssh port and centosssh port of centosVi/etc/ssh/sshd_configFind the section # Port 22, which indicates that Port 22 is used by default, and add a line as follows:Port 34981
Save and exit
Then the service sshd restart
Note: Do not turn it off here.
In addition, open a new window and try to connect to sshd. If
Some people often ask me whether port aggregation refers to link aggregation or VLAN trunking? Why did the teacher tell them all about this name? Is it wrong with the teacher or in the book.
After studying the Internet for so long, I have been using these two words in practice. In fact, this is not the same thing.
I checked the definition on Baidu:
Link AggregationIs to combine two or more data channels into a single channel, the channel appears in a
Sharing of multi-thread port scanning tools implemented by Python and python port scanning
It was written two nights last night and finally the Py Port Scanner was finished. Let's call it version 0.1 as a Python multi-thread Port scanning tool.
The level is limited. To tell the truth, there are some puzzles and puzzles
What is port mapping?
Port mapping is also called Port forwarding, and some are called NAT, virtual server. Port mapping process just like your home in a Community B building room 2410, your friends to find you, to find the community doorway, do not know where you live which number? asked the gatekeeper security, the
COM means the serial port, while LPT (not the LTP) means the parallel port. The serial port is a port provided by the computer bus for data transmission. In the serial port, data is transmitted in a bitwise stream, LPT is another port
Wireshark analyzes non-standard port traffic and wireshark PortWireshark analysis of non-standard port traffic 2.2.2 analysis of non-standard port traffic Wireshark analysis of non-standard port traffic
Non-standard port numbers are always the most common concern of network
It is very convenient to install ftp on a Linux server to provide users with upload and download. However, if your server has enabled the iptables firewall, you need to set the ftp port. I have also used iptables to allow access from a port. why do I need to demonstrate the ftp port? Because the ftp port is really spec
This time, say "ports" and "Port numbers".Usually hear people say "open port 80th", in order to secure "do not open redundant ports" and so on. So, what are the ports or port numbers here?First, the "port" is a concept used on TCP or UDP and is often likened to "windows". Also, the
Some time ago, I made vro networking. Because of the use of the openwrt operating system, it was easy to do so, but many detailed principles were ignored. So let's talk about the differences between WAN ports and LAN ports and how they work.
First, Baidu:
Anyone familiar with the network knows that Wan is written in the first letter of the English wide area network, that is, Wan, while LAN is written in the local area network, that is, local (or LAN ). Then we may give the WAN
Network administrators often need to connect to a vro to perform configuration verification, and statistical data review on the Cisco router. There are many methods to connect to a Cisco router, such as configuring a port, a secondary port, or using Telnet. However, I like to connect to the vro through the Console port for related management and configuration.
Th
I read an article in the "ziqingxing" friend blog about the implementation of a mini tool called "DuplexPipe. I didn't quite understand it at first. I read the open source code and wrote it in java, a jar package. Unfortunately, I don't know much about java, so I can't read it.After thinking about it for a long time, I decided to write it in C language. The initial goal was to build a program that can connect to the internal network sub-host hidden behind NAT from the Internet. After writing for
Commax serial port ing master
Keywords: serial port to TCP serial port to udp tcp to serial port UDP to serial port
Commax is a professional tool for RS232 ing RS232/422/485 serial port data and network data. It can work indep
C # serial port control, c # Serial Port
The serial port is the standard interface of a computer. Currently, a PC (Personal Computer) usually has at least two serial port COM1 and COM2. Serial interfaces are widely used in data communication, computer networks, and distributed industrial control systems. Serial Communi
Port speed limit:
Refers to the rate at which the port is throttled to a speed limit value.
Port Flow control:
On the basis of the port speed limit, if the port has the flow control function, you can control the packet rate to the speed limit value.
Example:
Linux port ing tool RINETD and port rining rinetd
Rinetd, a simple and easy-to-use tool in Linux, implements port ing, forwarding, and redirection.Official Website address http://www.boutell.com/rinetd
Software DownloadWget http://www.boutell.com/rinetd/http/rinetd.tar.gz
Unzip and installTar zxvf rinetd.tar.gzMakeMake install
Edit ConfigurationVi/etc/rinetd. con
Port mappings are also called port forwarding, virtual servers, and different broadband routers are named differently. A computer in the intranet needs port mapping to be on the Internet to open up services or receive data.
Port mappings are divided into dynamic and static. Dynamic
TTY Driver Architecture:1. TTY Concept Analysis1.1/dev/ttysca01.2/dev/tty1-n1.3/dev/consoleIn a Linux system, a terminal is a type of character device, which consists of many types, usually using a TTY for short-range end devices.. Serial Terminal (/dev/ttys*)The serial port terminal is the end device which uses the computer serial port connection. Linux considers each serial
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