iptables firewall

Q. I’ve Redhat Enterprise Linux 5 server with Iptabeles firewall enabled. By default it is only allowing port 22. How do I open port 80 / 143 / 110 on Linux? I’ve started all services but don’t know how to open port using iptables. A. By default iptables firewall stores its configuration at /etc/sysconfig/iptables file. […]

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I need to disable firewall in Linux for testing purpose. I’m using CentOS and RHEL version 4.4 / 5 / 6. How do I disable the firewall in Linux?

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How do I block an IP address or subnet under Linux operating system?

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Q. How do I stop or restrict access to my OpenSSH (SSHD) server using Linux iptables based firewall? A. Linux iptables firewall can be use to block or restrict access to ssh server. Iptables command is used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel. However, […]

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