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The POSTROUTING chain can call on the NAT and mangle tables In this chain, administrators can alter source IP address for the purposes of Source NAT (SNAT) This is also another point at which connection tracking can happen for the purpose of building a firewall
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The good news is that if you have a modern distribution of Linux, you probably already have Netfilter installed, compiled, and working A quick check is to simply try running the iptables command, like so:
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[root@serverA ~]# iptables -L
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On an Ubuntu system, you would run the command as
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yyang@ubuntu-serverA:~$ sudo iptables -L
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A quick check to see the IPv6 equivalent is by using the command:
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[root@serverA ~]# ip6tables -L
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Note that some distributions do not include the /sbin directory in the path and there is a good chance that the iptables program lives there If you aren t sure, try using one of the following full paths: /sbin/iptables, /usr/sbin/iptables, /usr/local/bin/iptables, or /usr/local/sbin/iptables The /bin and /usr/bin directories should already be in your path and should have been checked when you tried iptables without an absolute path If the command gave you a list of chains and tables, you ve already got Netfilter installed In fact, there is a good chance the installation process enabled some filters already! The Fedora distro, for example, gives an option to configure a basic firewall at installation time, and OpenSuSE also enables a more extensive firewall during the operating system (OS) install, while Ubuntu, on the other hand, does not enable any firewall out of the box With Netfilter already present, there isn t much else to do besides actually configuring and using it! The following section offers some useful information about some of the options that can be used when setting up (from scratch) a vanilla kernel that does not already have Netfilter enabled The complete process of installing Netfilter is actually two parts: enabling features during the kernel compilation process and compiling the administration tools We will examine the first part
Enabling Netfilter in the Kernel
Most of Netfilter s code actually lives inside of the kernel and ships with the standard kernelorg distribution of Linux In order to enable Netfilter, you simply need to enable the right options during the kernel configuration step of compiling a kernel If you are not familiar with the process of compiling a kernel, see 9 for details Netfilter, however, has a lot of options In this section, we cover what those options are and which ones you want to select just in case you are building your kernel from scratch and want to use Netfilter
13:
The Linux Firewall
Required Kernel Options
Three required modules must be supported: Network Packet Filtering, IP Tables, and Connection Tracking The first is found under the Networking Support | Networking Options menu when compiling the kernel This provides the basic Netfilter framework functionality in the kernel Without this option enabled, none of the other options listed will work Note that this feature cannot be compiled as a kernel module; it is either in or out The second, IP Tables, is found under Networking Support | Networking Options | Network Packet Filtering | IP: Netfilter Configuration The purpose of this module is to provide the IP Tables interface and management to the Netfilter system Technically, this module is optional, as it is possible to use the older ipchains or ipfwadm interfaces; however, unless you have a specific reason to stick to the old interface, you should use IP Tables instead If you are in the process of migrating from your old ipchains/ipfwadm configuration to IP Tables, you will want all of the modules compiled and available to you Finally, the Connection Tracking option (which can be found in the same place as the IP Tables option) offers the ability to add support for intelligent TCP/IP connection tracking and specific support for key protocols like FTP Like the IP Tables option, this can be compiled as a module
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