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iptables:tldr:b1732
iptables: Append rule to chain policy for IP.
$ sudo iptables -A ${chain} -s ${ip} -j ${rule}
try on your machine
This command uses the iptables
command line tool to add a rule to a specific chain in the firewall configuration. Here is the breakdown of the command:
sudo
: Thesudo
command is used to execute the following command as the superuser or with administrative privileges.iptables
: It is a command line utility in Linux used for configuring the firewall rules in the Linux kernel. This command is used to manage IP packet filtering and NAT (Network Address Translation).-A ${chain}
: This option specifies that the rule should be added to the specified chain.${chain}
is a placeholder for the name of the chain where the rule will be appended (e.g.,INPUT
,OUTPUT
,FORWARD
).-s ${ip}
: This specifies the source IP address for the rule.${ip}
is a placeholder for the actual IP address or IP range that you want to apply the rule to.-j ${rule}
: This option specifies the target or action to be taken if the conditions of the rule are met.${rule}
is a placeholder for the specific action to perform on the matching packets (e.g.,ACCEPT
,DROP
,REJECT
).
So, when you run this command with the appropriate values for ${chain}
, ${ip}
, and ${rule}
, it will add a new rule to the specified chain in the firewall configuration, filtering or altering the packets based on the specified source IP address and the action to take when a match occurs.
This explanation was created by an AI. In most cases those are correct. But please always be careful and
never run a command you are not sure if it is safe.