outgoing email ports

I. PrefaceIi. Basic Knowledge1. What is an IP address?2. What is a fixed IP address?3. What is a dynamic IP address?4. What is a domain name? What makes a domain name?5. What are subdomain names and second-level domain names?6. What is DNS?7. What

CAT/etc/sysconfig/iptables * Filter: Input accept [0: 0]: Forward accept [0: 0]: Output accept [28: 4192]-A input-p tcp-m tcp -- dport 22-M state -- state new, established-J accept-A input-p tcp-m tcp -- dport 21-M state -- state new, established-J

1. view the settings of iptables on the local machine. [[Email protected] ~] # Iptables-l-N Chain input (Policy accept) Target prot opt source destination Chain forward (Policy accept) Target prot opt source destination Chain output (Policy

Start configurationLet's configure a Filter the firewall of the table .(1) view this institution in IPTABLES the setup situation[Email protected] ~]# Iptables-l–n[Email protected] ~]/etc/sysconfig/iptables[Email protected] ~]/etc/init.d/iptables

Linux under Iptables configuration detailed-A rh-firewall-1-input-p tcp-m State--state new-m TCP--dport 24000-j ACCEPT-A rh-firewall-1-input-s 121.10.120.24-p tcp-m tcp--dport 18612-j ACCEPTIf your iptables basic knowledge is not yet known, it is

FIREWALLD Dynamic Firewall Manager service (Firewall Manager of Linux Systems) is currently the default firewall management tool, with a command line terminal and graphical interface configuration tool, Even unfamiliar with Linux commands can get

Linux under Iptables configuration detailed -A rh-firewall-1-input-p tcp-m State--state new-m TCP--dport 24000-j ACCEPT-A rh-firewall-1-input-s 121.10.120.24-p tcp-m tcp--dport 18612-j ACCEPT If your iptables basic knowledge is not yet known, it is

The first chapter of the experimental environment Hardware environment:Linux server one, IP address: 192.168.80.10;WIN7 client one, with OUTLOOK2013, test, and server in the same LAN. Linux system environments, such as: Chapter II

Multi-WLAN port router Principle AnalysisAt present, there are many vrouters with multiple WAN ports (WAN interfaces) on the market. Many people ask if the multi-WAN port vro is better than a single WAN port vro? In which scenarios do I need a multi-

A Iptables IntroductionThe firewall, in fact, is used to realize the Linux access control function, it is divided into hardware or software firewall two kinds. Regardless of the network in which the firewall works, it must be at the edge of the