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-s [!] address[/mask] [!] [port[:port]] Source address to match. With the port argument, you can specify the port. --sport [!] [port[:port]] -d [!] address[/mask] [!] [port[:port]] --dport [!][port[:port]] --icmp-type [!] typename -i [!] name[+] Source port specification. You can specify a range of ports using the colon, port:port. Destination address to match. With the port argument, you can specify the port. Destination port specification. Specify ICMP type. Specify an input network interface using its name (for example, eth0). The + symbol functions as a wildcard. The + attached to the end of the name matches all interfaces with that prefix (eth+ matches all Ethernet interfaces). Can only be used with the INPUT chain. Specify the target for a rule (specify [port] for REDIRECT target). Used with the SNAT target, rewrites packets with new source IP address. Used with the DNAT target, rewrites packets with new destination IP address. Numeric output of addresses and ports, used with L. Specify an output network interface using its name (for example, eth0). Can only be used with FORWARD and OUTPUT chains. Specify a table to use, as in t nat for the NAT table. Verbose mode, shows rule details, used with L. Expand numbers (display exact values), used with L. Match second through last fragments of a fragmented packet. Print package version. Negates an option or address. Specify a module to use, such as state. Specify options for the state module such as NEW, INVALID, RELATED, and ESTABLISHED. Used to detect packets state. NEW references SYN packets (new connections). SYN packets, new connections.
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-j target [port] --to-source ipaddr[- ipaddr] [: port- port] --to-destination ipaddr [- ipaddr][: port- port] -n -o [!] name[+]
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-t table -v -x [!] f [!] V ! -m --state
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--syn
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Table 40-5: iptables Options Function 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). Specify maximum burst before the limit kicks in. Used to control denial of service attacks.
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Iptables 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, like a second. In the following example, the user adds a rule to the INPUT chain to accept all packets originating from the address 192.168.0.55. Any packets that are received (INPUT) whose source address (-s) matches 192.168.0.55 are accepted and passed through (-j ACCEPT).
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iptables -A INPUT -s 192.168.0.55 -j ACCEPT
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There are two built-in targets, DROP and ACCEPT. DROP is the same as the ipchains DENY target. Other targets can be either user-defined chains or extensions added on, such as REJECT. There are two special targets 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 userspace (replaces -o in ipchains).
iptables -A INPUT -s www.myjunk.com -j DROP
You can turn a rule into its inverse with a ! symbol. For example, to accept all incoming packets except those from a specific address, place a ! symbol before the -s option and that address. The following example will accept all packets except those from the IP address 192.168.0.45:
iptables -A INPUT -j ACCEPT ! -s 192.168.0.45
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 192.168.0 can be represented by 192.168.0.0/225.255.255.0 or by 192.168.0.0/24. To specify any address, you can use 0.0.0.0/0.0.0.0 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 192.168.0.0 network and that are going (destination) anywhere at all (the -d option is left out or could be written as -d 0/0):
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