scan firewall for open ports

A lot of Linux distributions, the default Iptables service started only the most basic port, such as 22 port, but the other is forbidden State, because when you need to use a certain software or services will find its port is not working, you telnet not up!This time you can pass Netstat-an | grep port number to verify that the next is not already open a service if not to start it, Redhat series is generally: Service xxx start or/etc/init.d/xxx start i

ObjectiveThe topic said a bit long, in fact, is the following several things, the first is that the shell command can be executed within the program, and then pass the execution results to the variable, so that the subsequent transaction processing, the second is to use the Nmap command to get all the online IP and open ports in the current LAN, Finally, the results of nmap are processed to obtain only the

It is important to note that the firewall is managed by iptables in CentOS 6 and the firewall is managed by FIREWALLD in CentOS 7.1. In CentOS 7Use the following commandFirewall-cmd [--zone=As an example,Firewall-cmd--zone=public--add-port=8080/tcp--permanentExplain:--zone Scope--ADD-PROT=8080/TCP Port/Communication protocol--permanent is permanently active and w

The vcenter server requires port 80 for direct HTTP connections. Port 80 redirects the request to HTTPS port 443. This port is useful if you accidentally use http://server instead of https://server. 389 This port must be open on both local and all remote instances of Vcenter server. This is the LDAP port number of the directory service for the Vcenter server group. The vcenter server system needs to bind port 389, even if this vcenter server instance

-- dport 1723-d $ internet_addr-j dnat -- to-destination 192.168.100.2: 1723 Iptables-T Nat-A prerouting-p udp -- dport 1723-d $ internet_addr-j dnat -- to-destination 192.168.100.2: 1723 Iptables-T Nat-A prerouting-p udp -- dport 500-d $ internet_addr-j dnat -- to-destination 192.168.100.2: 500 Iptables-T Nat-A prerouting-p udp -- dport 4500-d $ internet_addr-j dnat -- to-destination 192.168.100.2: 4500 Nat of the FTP serverIptables-I pfwanpriv-P TCP -- dport 21-D 192.168.100.200-J acceptIptab

Telnet 192.168.1.245 3306Use the script above to test whether the port is open, and note that the service that is enabled for the terminal must be turned on.If it is not open,Vi/etc/sysconfig/iptables-A rh-firewall-1-input-m state--state new-m tcp-p TCP--dport 3306-j ACCEPTAdd this to the sentence, and note that this sentence must be added to the last sentence ab

The process of configuring the database found a problem with Windows connecting to the Linux database server, checking to see that Linux is not yet open 1521 portConfiguration, very easyReferenced by: http://www.cnblogs.com/kerrycode/archive/2012/12/14/2818421.html1. Someone directly service iptables stop, that is, shutting down the firewall, this is basically not feasible, because it is too insecure2. Rele

Reproduced from: https://www.cnblogs.com/jtestroad/p/8031850.html Important things to say three times, strongly recommend the use of the second method! second!; Ways to open ports: Method One: Command line mode1. Open port command:/sbin/iptables-i input-p TCP--dport 8080-j ACCEPT2. Saving:/etc/rc.d/init.d/iptables Save3. Restart Service:/etc/init.d/iptables resta

Introduced CentOS 7 does not use Iptables by default, so it is not possible to open 80 ports by editing the Iptables configuration file CentOS 7 uses a FIREWALLD firewall To query whether to open port 80: [root@joe-pc ~]# firewall-cmd--query-port=80/tcp No Appare

Sometimes we worked hard to install a service but found that unable to access, thinking that they did not install success, in fact, the solution is very simple, is to open the relevant port. For example, if I install Nginx or Apache, I need to release port 80 on the firewall. The relevant instance code is as follows./sbin/iptables-i input-p TCP--dport 80-j ACCEPT #开启80端口/sbin/iptables-i input-p TCP--dport 2

Ask PHP swoole extended scan IP 65,535 ports whether the idea of opening I've only recently learned about Swoole extensions, but I've learned about pthreads extensions before, but there's no idea. Issues that need to be addressed: 11,000 IP concurrent Scan survival (own resolution using ping or FSOCKOPEN,NODEJS, but too inefficient or want to use PHP environment)

For example, after installing Nagios, to open 5666 ports to connect to the server, the command is as follows:? 1 2 3 4 5 6 7 [Root@centos7-1 ~] # firewall-cmd--add-port=5666/tcp instantly open, this can also be a port range, such as 1000-2000/tcp success [Root@centos7-1 ~] #

1. Windows Firewall Open FTP serviceThe following 4 steps would allow both Non-secure and SSL FTP traffic through.Run cmd, after:1. If your FTP is a RC0 version, skip to the 3rd step, and if your version is RC0, enter the following command line in CMD and press ENTER to execute the command:SC Sidtype ftpsvc Unrestricted2. After performing the 1 steps, restart the FTP service:net stop ftpsvc net start ftpsv

Linux iptable firewall block and open ports Source: http://hi.baidu.com/zplllm/item/f910cb26b621db57c38d5983 Evaluation: 1, close all the INPUT FORWARD OUTPUT only to some ports open. Here is the command implementation: Iptables-p INPUT DROP Iptables-p FORWARD DROP Ipt

Update firewall rules: # firewall-cmd--reload# Firewall-cmd--complete-Reload the difference between the two is the first one without disconnecting, is one of the FIREWALLD features dynamically add rules, the second need to disconnect, similar to restart the service to add the interface to the zone, the default interface is public#

If you want to provide services on the server, the enterprise-class Linux distributions, such as CentOS or RHEL, contain built-in powerful firewalls, and their default firewall rules are very stringent. Therefore, if you install any custom services (such as Web servers, NFS, and Samba), their traffic is likely to be blocked by firewall rules. So you need to open

iptables Firewall 1, basic operation # View firewall status service iptables status # Stop Firewall service iptables Stop # Start Firewall service iptables start # Reboot Firewall Service iptables Restart # permanently shut down firewall