On a blog analysis of the serial drive initialization section, the following step-by-step analysis of serial port drive in the open serial, data transmission and reception.
Initialize main workflow:
First to analyze the serial port to open the operation process, or first figure:
Here, the analysis is inseparable from the last blog in two important pictures:
The important data structure of serial operat
The first two days of the engine room a Cisco2960 of the port often down, at that time let the engine room restart switch also useless, later let change a mouth on the recovery, but over a period of time the port will be down, on-line check may be due to the port-security of the Cisco switch caused the port down, Later
View the complete version: [-- Port details and how to enable and disable ports --]
I went to trustnet-platinum Network Management-Internet-Software Development-> Windows-> port explanation and how to enable port closure [print this page]
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without tag;In practice, various connection methods are implemented according to the access, Trunk, and hybrid properties of the device ports. The application of port attributes is also far beyond the simple VLAN member interconnect, especially our division, with Port properties to implement some relatively complex functions, such as Isolated-user VLAN, multicast VLAN.Principles of processing 3.3 Tag/untag
The main function of Port-channel in practical work is to bundle two or more ports into a virtual channel.Interface Port-channel1Description Port (1/0/5-6)Switchport Trunk Encapsulation dot1qSwitchport Trunk allowed VLAN 10Switchport mode Trunk!Interface Port-channel2Description Po
First you must know that the port does not exist independently, it is dependent on the process. When a process is turned on, its corresponding port is turned on and the process shuts down, and the port is closed. The next time a process is turned on again, the corresponding port is turned on again. Instead of purely un
Prerequisite: First you must know that the port is not independent, it is dependent on the process. When a process is turned on, its corresponding port is turned on and the process shuts down, and the port is closed. The next time a process is turned on again, the corresponding port is turned on again. Instead of purel
Prerequisite: First you must know that the port is not independent, it is dependent on the process. When a process is turned on, its corresponding port is turned on and the process is closed, and the port is closed. The next time a process opens again, the corresponding port is opened again. Instead of simply understan
Tags: reserve list update out IV output put deployment article1. BackgroundWhen the Linux server starts, the specified port is monitored for bind, and if the port on the same machine is already in use, the listener fails and the program fails to start.When the Linux client connects to the server accept, the system allocates a local temporary port for the network
Reprinted from: http://yangrong.blog.51cto.com/6945369/1582184
Docker container once started, the parameters can not be changed, production environment is the most common change is the port mapping, in order to solve this problem, then the first plan, this article lists two port planning scenarios, if there is a subsequent maintenance to increase the port mapping
Different ports have different functions I hope we can get something out of it.
0 is typically used to analyze the operating system. This approach works because "0" is an invalid port in some systems and will produce different results when you try to connect to it using a common closed port. A typical scan: Use an IP address of 0.0.0.0 to set the ACK bit and broadcast on the Ethernet layer.
1 Tcpmux This
In this guide, we will show you how to use the simple Netcat (NC) command to determine if the port on the remote host is accessible/open.
Netcat (or NC) is a powerful and Easy-to-use program that can be used in Linux for anything related to TCP, UDP, or UNIX domain sockets.
# yum Install NC [in Centos/rhel]
# DNF Install NC [in Fedora 22+]
$ sudo apt-get install [in In Debian/ubuntu]
We can use it to open a TCP
To modify the default port for SSH:1, the file that controls the SSH access port is /etc/ssh/sshd_config .Therefore, edit the SSH configuration file sshd_config:#vi/etc/ssh/sshd_config2. Find the Port=22 field and remove the comment that precedes it:#Port //Remove the Note ##AddressFamily any#ListenAddress 0.0.0.0#Lis
1. You can see which ports are open by "~$ NETSTAT-ANP".
(Note: The parameter '-n ' will turn the application to the port display, that is, the number format of the address, such as: nfs->2049, ftp->21, so you can open two terminals, each corresponding to the program corresponding to the port number)
2. The program that applies the port can then be viewed through
Using SSH over the HTTPS portSometimes, firewalls refuse to allow SSH connections entirely. If using HTTPS cloning with credential caching are not a option, you can attempt to clone using an SSH connection made Ove R the HTTPS port. Most firewall rules should allow this, but proxy servers may interfere.GitHub Enterprise Users:accessing GitHub Enterprise via SSH over the HTTPS port was currently not supporte
See here: http://blog.csdn.net/j2eevic/article/details/7301027
I was modified 8080 for 8089 port
Due to the 8080 port number being occupied by other projects, the modification of the next ofbiz default port number (8080,8443) is analyzed today. Find that only two files need to be modified, or relatively simple.
1.8080 and 8443 ports in the following sections in
Important thing to say three times, it is strongly recommended to use the second Method! Second Method!;Ways to open ports:Method One: Command line mode1. Open port command:/sbin/iptables-i input-p TCP--dport 8080-j ACCEPT2. Save:/etc/rc.d/init.d/iptables Save3. Restart Service:/etc/init.d/iptables restart4. Check if the port is open:/sbin/iptables-l-NMethod Two: Directly edit the/etc/sysconfig/iptables fil
Important thing to say three times, it is strongly recommended to use the second Method! Second Method!;Ways to open ports:Method One: Command line mode1. Open port command:/sbin/iptables-i input-p TCP--dport 8080-j ACCEPT2. Save:/etc/rc.d/init.d/iptables Save3. Restart Service:/etc/init.d/iptables restart4. Check if the port is open:/sbin/iptables-l-NMethod Two: Directly edit the/etc/sysconfig/iptables fil
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