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How do I whitelist an IP address in iptables?

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How do I whitelist an IP address in iptables?

How To: Whitelist An IP Address In IPTables

  1. Example: How to whitelist IP address 192.168.0.1.
  2. Step 1: Log into the server via SSH.
  3. Step 2: Allow incoming connections from 192.168.0.1. # iptables -A INPUT -s 192.168.0.1 -j ACCEPT.
  4. Step 3: Allow outgoing connections to 192.168.0.1.
  5. Additional Options:

How do I enable ports in iptables?

Individual commands method

  1. Run the following command to allow traffic on port 80: sudo iptables -I INPUT -p tcp -m tcp –dport 80 -j ACCEPT.
  2. Run the following command to allow traffic on port 443: sudo iptables -I INPUT -p tcp -m tcp –dport 443 -j ACCEPT.

How do I block and unblock a port in Linux?

Procedure

  1. Add iptables rule to block IP Address. iptables -A INPUT -s IP-ADDRESS-HERE -j DROP.
  2. Add iptables rule to block IP Address access to a specific port.
  3. Drop/Remove iptables rule to unblock IP Address.
  4. Drop/Remove iptables rule to unblock IP Address access to a specific port.

How do I block an IP address in Linux iptables?

iptables tool

  1. Run the following command to block the IP address: sudo iptables -I INPUT -s xxx.xxx.xxx.xxx -j DROP.
  2. Run the following command to save the settings. The settings persist after the server reboots. sudo service iptables save.
  3. Run the following command to list and verify the new rule: sudo iptables -L.

How do I whitelist an IP in Linux?

How to whitelist IP address using CLI in CSF?

  1. Login to your linux server using root or sudo user.
  2. Go to the path /etc/csf/.
  3. Inside the CSF directory, edit the file called csf. allow.
  4. Add the IP address which you want to whitelist. Save the file.
  5. Restart the firewall after adding the IP address.

How do I list an IP table?

How to list all iptables rules on Linux

  1. Open the terminal app or login using ssh: ssh user@server-name.
  2. To list all IPv4 rules : sudo iptables -S.
  3. To list all IPv6 rules : sudo ip6tables -S.
  4. To list all tables rules : sudo iptables -L -v -n | more.
  5. To list all rules for INPUT tables : sudo iptables -L INPUT -v -n.

How do I check if a port is blocked on Linux?

If you have access to the system and you want to check whether it’s blocked or open, you can use netstat -tuplen | grep 25 to see if the service is on and is listening to the IP address or not. You can also try to use iptables -nL | grep to see if there is any rule set by your firewall.

How do I enable port 8080 in iptables?

Adjusting IPTables to accept requests on port 80

  1. Allow inbound access to tcp port 80:
  2. Allow inbound access to tcp port 8080:
  3. Redirect inbound requests to port 80 to port 8080:
  4. Display the current IPTables rules:
  5. Save the running IPTables configuration to /etc/sysconfig/iptables :

How do I block iptables ports?

To block the port only on a specific interface use the -i option. To block port only for given IP or Subnet use the -s option to specify the subnet or IP addess. Save the iptables for rules to be persistent across reboots. Save the iptables for rules to be persistent across reboots.

How do I Block a specific port in Linux?

To block these ports, follow the instructions below.

  1. As user root, stop the iptables service:
  2. Delete the current iptables file:
  3. Start iptables:
  4. Copy/paste the following commands to the CLI:
  5. Save the new iptables configuration:
  6. List the configuration to verify filters:

How do I Block an IP address in Linux?

Step 2: Add new Iptables rule Replace IP-ADDRESS with the actual IP address that you want to block completely. The above rule will drop all packets coming from that particular IP to all server ports.

How to delete / unblock an IP address in iptables?

Look at the number on the left, then use number to delete it. For example delete line number 10 (subner 134.175.0.0/16), enter: iptables -D INPUT 10 You can also use the following syntax to delete / unblock an IP use the following syntax: iptables -D INPUT -s xx.xxx.xx.xx -j DROP iptables -D INPUT -s xx.xxx.xx.xx/yy -j DROP

How can I block a particular port for a particular IP?

You can simply block by using the above mentioned switches. See the below pasted examples; Where xx.xx.xx.xx is the IP address which you want to block. Then save the newly added rules to iptables. How can I block a particular PORT for a particular IP on your Linux server?

How iptables can be used to block IPS?

By using iptables you can block particular IP address or a range of IP addresses on your server to protect your server. In this way you can block IPs which are in listed on your secure log for suspicious activities.

How can I unblock IP address from block-list?

How can I unblock IP address from block-list? You can allow IP address by changing the target to ACCEPT (iptables -A INPUT -s IP-ADD -j ACCEPT). But, if the IP address is already blocked in your server firewall, the allowing method using “ACCEPT” as target will not work. Because, we have already added one rule for this IP to block.

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