Linux: Iptables Examples For New SysAdmins Part -->3

Before see this post please read my previous post (Linux: Iptables Examples For New SysAdmins Part -->2)

#12: Log and Drop Packets

 

Type the following to log and block IP spoofing on public interface called eth1

# iptables -A INPUT -i eth1 -s 10.0.0.0/8 -j LOG --log-prefix "IP_SPOOF A:

# iptables -A INPUT -i eth1 -s 10.0.0.0/8 -j DROP

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Linux: Iptables Examples For New SysAdmins Part -->2

Before see this post please read my previous post (Linux: Iptables Examples For New SysAdmins Part -->1)

#3: Delete Firewall Rules

To display line number along with other information for existing rules, enter:

# iptables -L INPUT  -n --line-numbers
# iptables -L OUTPUT -n --line-numbers
# iptables -L OUTPUT -n --line-numbers | less
# iptables -L OUTPUT -n --line-numbers | grep 192.0.43.10

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Linux: Iptables Examples For New SysAdmins Part -->1

Linux comes with a host based firewall called Netfilter. According to the official project site:

netfilter is a set of hooks inside the Linux kernel that allows kernel modules to register callback functions with the network stack. A registered callback function is then called back for every packet that traverses the respective hook within the network stack.

This Linux based firewall is controlled by the program called iptables to handles filtering for IPv4, and ip6tables handles filtering for IPv6. I strongly recommend that you first read our quick tutorial thatexplains how to configure a host-based firewall called Netfilter (iptables) under CentOS / RHEL / Fedora / Redhat Enterprise Linux. This post list most common iptables solutions required by a new Linux user to secure his or her Linux operating system from intruders.

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Redhat / CentOS Iptables Firewall Configuration

H

ow do I configure a host-based firewall called Netfilter (iptables) under CentOS / RHEL / Fedora / Redhat Enterprise Linux?

Icon reference for Firewall

Netfilter is a host-based firewall for Linux operating systems. It is included as part of the Linux distribution and it is activated by default. This firewall is controlled by the program called iptables. Netfilter filtering take place at the kernel level, before a program can even process the data from the network packet.

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