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Precautions for binding ports to Linux Network Programming and port reuse (1) The so-called binding (bind) means that when someone connects to me, I can only use the port I bind, which is equivalent to buying a mobile phone. If someone else wants to contact me, he must know my mobile phone number, what should I do at this time? I need to plug in a phone card to fix a phone number so that someone else can contact me through this phone number. The mobi
"hard" operations on network devices. The security factor is high, but the obtained information is not accurate. For example, if the IP address of a server has been changed, we can think that the server is not connected to the network because the original IP address cannot be found on the switch. The system administrator first checks the IP address information on the server, and then finds out which port of the switch the IP address is located on. The information obtained by this method is very
In the previous studies on the BCM version, the WAN port was extended but could not be online due to the lack of in-depth research. Due to the time relationship, the research was not continued. When I first came back yesterday, I began to study this item and successfully expanded bcm to N Wan. I cut a picture and set one of the four or more ports to online. In fact, BCM expands the WAN, most of which is used for small bandwidth aggregation. This sav
Http://blog.csdn.net/wudiyi815/article/details/7473097 Premise: First, you must know that a port does not exist independently and is attached to a process. If a process is enabled, the corresponding port is enabled. if the process is disabled, the port is closed. If a process is enabled again next time, the corresponding port is enabled again. Rather than simply disabling a port, you can disable it. 1. You can use "~ $ Netstat-ANP "to check which po
The ICMP and IP protocol belong to the same level (network layer), and its message is also transmitted in the IP packet, and the portIs the concept of the Transport Layer TCP/UDP protocol, so the ping port is not successful* * Windows Check the portsTelnet IP PortNetstat-na//Display native connection condition and open portNetstat-nab//shows which programs are created for each connectionPort monitor: Tcpview, Port Reporter, Green Hawk PC Universal Genie, Network Port Viewer, etc.The use of Nmapw
1. Download the Monitoring pluginwget http://nagios-snmp.cvs.sourceforge.net/nagios-snmp/plugins/check_snmp_int.pl2. First look at all the ports that the switch is currently openingFor i in ' seq 1 ';d o/usr/local/nagios/libexec/check_snmp_int.pl-h 192.168.0.254 -C PU Blic -N "^gigabitethernet1/0/$i $";d One3. Add Monitoring------------------------------------------------------------------------------------------Vim Hosts.cfgDefine host {Use Generic
Several ports (8005,808 0, 8009) required, 80058009 Sometimes tomcat crashes. Restart eclipse and start the tomcat service again, Several ports (8005,808 0, 8009) required by Tomcat v8.5 Server at localhost are already in use. Literally, port 8005,808 0 and port 8009 are occupied. Solution:Method 1: Kill the software that occupies the port. Open the task manager, find the Java Virtual Machine-related p
Several ports (8005,808 0, 8009) required by Tomcat v7.0 Server at localhost are already in use. Solution: 800580808009 is occupied Several ports (8005,808 0, 8009) required by Tomcat v7.0 Server at localhost are already in use. the server may already be running in another process, or a system process may be using the port. to start this server you will need to stop the other process or change the port num
Netstat This command is commonly used in network monitoring. With this command, you can view the current system listening services and established services, as well as the corresponding ports, protocols and other information.Netstat parameter descriptionNetstat parameters, although a lot, but often not much, mainly the following several parameters:Netstat-[ATUNLP] -a:all, indicating that all connections, service monitoring, socket data are liste
TCP: Transmission Control Protocol SYN: Request signal ACK: controlled command for acknowledgmentUDP: User Datagram ProtocolUDP belongs to a TIP/IP protocol family1. Turn on network port statusNetstat is a console command and is a very useful tool for monitoring TCP/IP networks, which can display routing tables, actual network connections, and status information for each network interface device. The netstat is used to display statistics related to IP, TCP, UDP, and ICMP protocols, and is typica
Netstat This command is commonly used in network monitoring. With this command, you can view the current system listening services and established services, as well as the corresponding ports, protocols and other information.Netstat parameter descriptionNetstat parameters, although a lot, but often not much, mainly the following several parameters:Netstat-[ATUNLP] -a:all, indicating all connections, service listening, socket data -t:tcp,
1. Open the configuration file[Root@localhost ~]# vi/etc/sysconfig/iptables 2. The correct configuration file# Firewall configuration written by System-config-firewall# Manual Customization of this file are not recommended.*filter:input accept [0:0]: FORWARD ACCEPT [0:0]: OUTPUT ACCEPT [0:0]-A INPUT-state–state established,related-j accept-a INPUT -P icmp-j accept-a input-i lo-j accept-a INPUT-m state–state NEW-m tcp-p tcp–dport 22-j accept-a INPUT-m state–state NEW-m tcp-p tcp–dport 80-j accept
Before I was busy setting up the environment, I didn't have time to write it, now fill it up.On Linux, when we use the one-click installation package to build the environment, the firewall automatically releases. For example, sometimes it is convenient to use tools to remotely connect to Redis for the time being.Obviously the environment has been set up, the corresponding changes in the configuration is not even, at this time, we should see if our firewall released noView status: Iptables-l-NOpe
copy redis.conf named Redis6380.conf, and edit the configuration filecp/etc/redis/redis.conf/etc/redis/redis6380.confvi/etc/redis/redis6380.confSeveral parameters need to be modifiedpidfile//run/redis/redis6380-~//log/redis/redis6380-~Then save it and start the configuration file directly.redis-server/etc/redis/redis6380.confWe can view the next processpsauxf|grepredis-serverThe discovery did start with two Redis ports, but the two Redis process user
Netstat-tln The meaning behind the netstat · Proto shows the protocol used by the connection.· REFCNT represents the process number that is connected to this set of interfaces.· Types shows the type of the socket interface.· State displays the current status of the socket interface.· Path indicates the pathname used by other processes connected to the socket The NETSTAT-TLN command is used to view the port usage of Linux. NETSTAT-A View all service ports
View Status:Iptables-l-NAdd the following methods for opening a specific port:Use Iptables to open the following ports/sbin/iptables-i input-p TCP--dport 8000-j ACCEPTSave/etc/rc.d/init.d/iptables SaveRestart ServiceService Iptables RestartSee if the port you want to open takes effect?/etc/init.d/iptables statusAct 2:or edit/etc/sysconfig/iptables directly-A input-p tcp-m tcp--dport 4000-j ACCEPTSave in the previous sectionReboot again:Service Iptable
Modify SSH ports and disable root remote login settings in Linux View the system version below[Email protected] ~]# cat/etc/redhat-releaseCentOS Release 6.7 (Final) Modifying a configuration fileLinux Modify Portvim /etc/ssh/sshd_configFind #portRemove the previous # and then modify port 1234650) this.width=650; "src=" Https://s1.51cto.com/wyfs02/M01/9B/AE/wKiom1ll2nOBTfZVAAANOYt0oEw047.png "title=" 11. PNG "alt=" Wkiom1ll2nobtfzvaaanoyt0oew047.
#!/usr/bin/env python#-*-Coding:utf-8-*-Import Socket,sysFrom Optparse import OptionparserStat_ok=0Stat_warning=1stat_critical=2Stat_unknown=3def check_port (Address,port):S=socket.socket (Socket.af_inet,socket. SOCK_STREAM)S.settimeout (3)TryS.connect ((Address,port))print "Check ssh port%s OK"%portSys.exit (STAT_OK)Except Exception,e:print "Check ssh port%s failed:%s"% (port,e)Sys.exit (stat_critical)def work ():P=optionparser ()P.add_option ("-A", "--address", dest= "address", default= "127.0
' try : from oscore import setting #导入配置文件 if Setting.status = = ' online ': #如果配置中是线上的, the program is running in the background daemonize () excep T exception:pass app = Default_app () app = Sessionmiddleware (app, session_opts) # Sessionmiddleware is session plugin run (app=app,host= ' 0.0.0.0 ', port=portnum,server= ' gevent ') Best, with Nginx proxy to load these ports,
Modify SSH ports and disable root telnet under LinuxAs we all know, SSH default port number is 22, to change the port number is 9688, need to edit/etc/ssh/ssh_config and/etc/ssh/sshd_config two files can;To disable root login, you need to edit the/etc/ssh/sshd_config. (Some Linux directories may be/etc/sshd, please modify according to the actual situation)The procedure is as follows:1. Edit the/etc/ssh/ssh_config file:[Email protected] ~]# cat/etc/ssh
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