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TCP və UDP-nin iki istiqamətli trafik üçün yalnız bir porta ehtiyacı var.

TCP və UDP port nömrələrinin siyahısı - Bu, şəbəkə tətbiqlərinin işləməsi üçün protokolların istifadə edildiyi TCP və UDP port nömrələrinin siyahısıdır.

Once we have added the rules,We need to save the rules and make them permanent.If you are using Ubuntu You can use iptables-persistent and for Centos you use iptables save command Note: Kindly Replace your_server_ip to the required IP in above command and Replace xxxx with the required port Step 3 : Save the Iptable Rule Use below command to open port only for Single IP sudo iptables -A INPUT -p tcp -s your_server_ip -dport xxxx -j ACCEPT If you do not wish to open port publicily,You can open port for a Single IP. Target prot opt source you wish to remove the rule that was recently added,You can use below command sudo iptables -D INPUT -p tcp -dport xxxx -j ACCEPT You can view the same with iptables -L as mentioned on step1 iptables -LĪCCEPT tcp - anywhere anywhere tcp dpt:mysql This basically tells the Iptable to accept connection to Mysql publicly. sudo iptables -A INPUT -p tcp -dport 3306 -j ACCEPT Note: Replace xxxx with required port number you wish to openįor example to open a Mysql port 3306,We need to run below command. sudo iptables -A INPUT -p tcp -dport xxxx -j ACCEPT Once we are aware of the rules that are currently configured,We can open a port in IPtables by adding a rule using below command. Use below commands to save an Iptable rule iptables-save > IPtablesbackup.txt Step 2 : Add/Remove an Iptable rule Target prot opt source Step 2 : Backup the Iptablesīefore proceeding with adding rules in Iptable,We need to take a backup of Iptable rules, Incase if any issue with configuration of Iptables we can restore the rules from backup We can see output as below,Which will display all the rules that are configured currently iptables -LĪCCEPT all - anywhere anywhere state RELATED,ESTABLISHEDĪCCEPT tcp - anywhere anywhere state NEW tcp dpt:sshĪCCEPT tcp - anywhere anywhere state NEW tcp dpt:httpĪCCEPT tcp - anywhere anywhere state NEW tcp dpt:httpsĪCCEPT tcp - anywhere anywhere state NEW tcp dpt:1167ĪCCEPT tcp - anywhere anywhere state NEW tcp dpt:zabbix-agent

Step 1 : List the current Iptables rulesĬonnect to your server with Sudo access and to list the current rules that are configured for iptables,Use below command sudo iptables -L Sudo access to Ubuntu or Centos server with Iptable installed in it. In this article,We will share you the steps to open the ports in Iptables firewall in Ubuntu and Centos distribution Prerequisite

Iptables almost always comes pre-installed on any Linux distribution.Having a properly configured firewall is very important for the overall security on your server. Iptables is a user-space utility program that allows a system administrator to configure the tables provided by the Linux kernel firewall and the chains and rules it stores.