How to Open Ports on Linux Server


This article will provide a guide for how to open ports on Linux server. This guide requires root-equivalent access.

How to Open Ports with iptables

All Linux distributions are packaged with iptables, a software firewall.

In our examples, we will demonstrate how to open ports for both inbound and outbound tcp and udp traffic on IPv4. For IPv6-related changes, use ip6tables.

To open ports 4081-4085 for inbound tcp traffic over IPv4, use the following command:

iptables -I INPUT -p tcp --dport 4081:4085 -j ACCEPT

To open ports 4081-4085 for inbound udp traffic over IPv4, use the following command:

iptables -I INPUT -p udp --dport 4081:4085 -j ACCEPT

To open ports 4081-4085 for outbound tcp traffic over IPv4, use the following command:

iptables -I OUTPUT -p tcp --sport 4081:4085 -j ACCEPT

To open ports 4081-4085 for outbound tcp traffic over IPv4, use the following command:

iptables -I OUTPUT -p udp --dport 4081:4085 -j ACCEPT

How to Open Ports with firewalld

To open ports 4081-4085 with firewalld, use the following commands:

firewall-cmd --zone=public --permanent --add-port=4081-4085/tcp
firewall-cmd --reload

Conclusion

These examples have demonstrated how to open ports on Linux server using iptables.

  • iptables, firewall, waf, network, network configuration, linux server, linux
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