Sudo iptables -I NAME_OF_THE_CHAIN 1 -s IP-ADRESS -j DROP Inserting the new rule to the selected position in the chain: Sudo iptables -D NAME_OF_THE_CHAIN -s IP-ADRESS -j ~]# sudo iptables -D test -s 217.160.172.48 -j DROP In the example below, the rule is added to the test chain to reject data packets from the IP address ~]# sudo iptables -A test -s 217.160.172.48 -j DROPĭeleting the specified rule in the selected chain: Sudo iptables -A NAME_OF_THE_CHAIN -s IP-ADRESS -j DROP In the example provided below, the packet is automatically accepted if the filter rules of the INPUT chain do not ~]# sudo iptables -P INPUT ACCEPTĪttaching a new rule to a selected chain: Sudo iptables -F ~]# sudo iptables -F test Sudo iptables -L ~]# sudo iptables -L test Sudo iptables -X ~]# sudo iptables -X test Sudo iptables -N ~]# sudo iptables -N test
Other important commands for iptables are listed below: Without configuration, the action ACCEPT is executed by default. In standard chains the policy of the chain is executed. RETURN: The packet is returned to the previous chain if it is a user-defined chain. QUEUE: Moves the package into the user processes requires a queue handler that forwards the packages to an application. Each rule can cause a jump or a goto another chain. These packets are passed from rule to rule within a chain.
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The tables loaded with the software and previously created by the kernel contain chains of rules that define how incoming and outgoing data packets are to be handled. The packet check and the filter rules to be created with iptables are structured in three stages. iptables requires extended system privileges and can only be run as root or with administrator rights.
On Linux, iptables is usually pre-installed. For the other protocols there are corresponding variants such as ip6tables for IPv6 or ebtables for Ethernet packets, which are also included in the kernel module. iptables is limited to the IPv4 protocol. With an init script this is done automatically during the boot process. Sudo ifup -force ~]# sudo ifup -force ens192 In this case, enter the same command with the -force parameter:
If this command fails, it is possible that the interface is in a state unknown to the command script. You can reactivate a deactivated interface with the following command: After entering the command, the status of each interface is ip addrġ: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 To display the configured interfaces, enter the command ip addr.