Kernel which supports netfilter

Hamilton Vera. Iptables is just a front end to manipulate netfilter rules. My goldfish kernel hasn't iptables inside. I try to make new kernel by make menuconfig , but nothing. I have to compile my iptables and then load this program. First you have to focus on netfilter kernel then you focus on compiling iptables. In my kernel source there are folder you have told me.

Now what I have to do? I try to compile my iptables source out of emulator. Is it correct? Hi there, so I want to enable iptable command on my HTC hero. Whether it need to download the all kernel tree.

Can anyone tell me about that for detail? Thanks Brad and Hamilton for your answers. The remarkable flexibility of Linux netfilter is illustrated by its ability to emulate the ipfwadm and ipchains interfaces. Emulation makes transition to the new generation of firewall software a little easier. The two netfilter kernel modules called ipfwadm. When the appropriate module is loaded, netfilter works exactly like the former firewall implementation.

The iptables utility is used to configure netfilter filtering rules. Its syntax borrows heavily from the ipchains command, but differs in one very significant respect: it is extensible. What this means is that its functionality can be extended without recompiling it. It manages this trick by using shared libraries.

Before you can use the iptables command, you must load the netfilter kernel module that provides support for it. The easiest way to do this is to use the modprobe command as follows:.

To facilitate this, there are two tables of rules called filter and nat. The filter table is assumed if you do not specify the -t option to override it.

Five built-in chains are also provided. There are a number of ways we can manipulate rules and rulesets with the iptables command. Those relevant to IP firewalling are:. Append one or more rules to the end of the nominated chain. If a hostname is supplied as either a source or destination and it resolves to more than one IP address, a rule will be added for each address. Insert one or more rules to the start of the nominated chain. Again, if a hostname is supplied in the rule specification, a rule will be added for each of the addresses to which it resolves.

Delete the rule residing at position rulenum in the specified chain. Rule positions start at 1 for the first rule in the chain. Replace the rule residing at position rulenum in the specific chain with the supplied rule specification. Check the datagram described by the rule specification against the specific chain. This command will return a message describing how the chain processed the datagram. This is very useful for testing your firewall configuration and we will look at it in detail later.

Zero the datagram and byte counters for all rules of the specified chain, or for all chains if no chain is specified. Create a new chain with the specified name. A chain of the same name must not already exist. This is how user-defined chains are created. Next page. Kernel Configuration for iptables Before you can use iptables , you must build support for it into the Linux kernel.

Authors: Roderick W. Linux Networking Cookbook. Linux Routing. Maximum Linux Security 2nd Edition. MySQL Clustering. Special Edition Using Crystal Reports Python Programming for the Absolute Beginner, 3rd Edition. What can I do with netfilter? What value does nftables provide? Licensing terms.