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20:
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Option -m --state
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Function Specifies a module to use, such as state Specifies options for the state module such as NEW, INVALID, RELATED, and ESTABLISHED Used to detect packet s state NEW references SYN packets (new connections) SYN packets, new connections TCP flags: SYN, ACK, FIN, RST, URG, PS, and ALL for all flags Option for the limit module (-m limit) Used to control the rate of matches, matching a given number of times per second Option for the limit module (-m limit) Specifies maximum burst before the limit kicks in Used to control denial-of-service attacks
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--syn --tcp-flags --limit
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--limit-burst
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TABLE 20-5 IPtables Options (continued )
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The IPtables package is designed to be extensible, and there are number of options with selection criteria that can be included with IPtables For example, the TCP extension includes the --syn option that checks for SYN packets The ICMP extension provides the --icmp-type option for specifying ICMP packets as those used in ping operations The limit extension includes the --limit option, with which you can limit the maximum number of matching packets in a specified time period, such as a second In the following example, the user adds a rule to the INPUT chain to accept all packets originating from the address 192168055 Any packets that are received (INPUT) whose source address (-s) matches 192168055 are accepted and passed through (-j ACCEPT):
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iptables -A INPUT -s 192168055 -j ACCEPT
Accepting and Denying Packets: DROP and ACCEPT
There are two built-in targets, DROP and ACCEPT Other targets can be either user-defined chains or extensions added on, such as REJECT Two special targets are used to manage chains, RETURN and QUEUE RETURN indicates the end of a chain and returns to the chain it started from QUEUE is used to send packets to user space
iptables -A INPUT -s wwwmyjunkcom -j DROP
PART V
You can turn a rule into its inverse with an ! symbol For example, to accept all incoming packets except those from a specific address, place an ! symbol before the -s option and that address The following example will accept all packets except those from the IP address 192168045:
iptables -A INPUT -j ACCEPT ! -s 192168045
Part V:
Security
You can specify an individual address using its domain name or its IP number For a range of addresses, you can use the IP number of their network and the network IP mask The IP mask can be an IP number or simply the number of bits making up the mask For example, all of the addresses in network 1921680 can be represented by 19216800/225255 2550 or by 19216800/24 To specify any address, you can use 0000/0000 or simply 0/0 By default, rules reference any address if no -s or -d specification exists The following example accepts messages coming in that are from (source) any host in the 19216800 network and that are going (destination) anywhere at all (the -d option is left out or could be written as -d 0/0):
iptables -A INPUT -s 19216800/24 -j ACCEPT
The IPtables rules are usually applied to a specific network interface such as the Ethernet interface used to connect to the Internet For a single system connected to the Internet, you will have two interfaces, one that is your Internet connection and a loopback interface (lo) for internal connections between users on your system The network interface for the Internet is referenced using the device name for the interface For example, an Ethernet card with the device name /dev/eth0 would be referenced by the name eth0 A modem using PPP protocols with the device name /dev/ppp0 would have the name ppp0 In IPtables rules, you use the -i option to indicate the input device; it can be used only with the INPUT and FORWARD chains The -o option indicates the output device and can be used only for OUTPUT and FORWARD chains Rules can then be applied to packets arriving and leaving on particular network devices In the following examples, the first rule references the Ethernet device eth0, and the second, the localhost:
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