Block any traffic heading into either network from any IP address
starting with 43.11.x.x.
To block any traffic heading into either network from any IP address starting with 43.11.x.x, you would need to apply access control lists (ACLs) on the routers or firewalls that are at the edge of the networks. The specific steps to configure the ACLs may vary based on the device and its operating system, but here is a general example:
1. Access the command-line interface (CLI) of the router or firewall.
2. Identify the inbound interfaces on which you want to block the traffic. For example, if the networks are connected to interface GigabitEthernet0/0, you would need to configure ACLs on this interface.
3. Create an access control list that matches traffic from the IP range 43.11.x.x. The exact syntax may vary depending on the device, but an example ACL could be:
```
access-list 100 deny ip 43.11.0.0 0.0.255.255 any
```
This ACL denies any IP traffic from the 43.11.0.0/16 subnet to any destination IP address.
4. Apply the ACL to the inbound interface(s). For example, on interface GigabitEthernet0/0, you would use the following command:
```
interface GigabitEthernet0/0
ip access-group 100 in
```
This command applies access list 100 to the inbound traffic on this interface.
Note: Make sure to adjust the interface names and ACL numbers to match your specific network environment.
By configuring this access list, any traffic originating from IP addresses in the range 43.11.x.x (where x can be any value) will be blocked from entering the network.
Here are the step-by-step instructions to block any traffic heading into either network from any IP address starting with 43.11.x.x:
1. Access your network firewall or router:
- Open a web browser.
- Enter the IP address of your network firewall or router in the address bar.
- Press Enter to navigate to the login page.
2. Log in to the firewall or router:
- Enter your administrator username and password.
- Click on the Login or Sign In button.
3. Navigate to the Firewall or Security settings:
- Look for the Firewall or Security section in the menu.
- Click on it to expand the options.
4. Create a new firewall rule:
- Look for the option to add or create a new firewall or security rule.
- Click on it to open the rule creation page.
5. Specify the rule criteria:
- Look for the source or origin IP address field.
- Enter "43.11.0.0" as the starting IP address.
- Set the subnet mask to "255.255.0.0" or "/16" to cover the entire 43.11.x.x range.
6. Define the action to block traffic:
- Look for the action field or dropdown menu.
- Select the option to block or deny traffic.
- Make sure to specify that the blocking action applies to incoming or inbound traffic.
7. Apply the rule:
- Look for a save, apply, or activate button.
- Click on it to save and activate the rule.
8. Test the blocking rule:
- In a separate network, try to establish a connection to your network from an IP address starting with 43.11.x.x.
- If the rule is successfully applied, the connection should be rejected or timed out.
Please note that the exact steps and options may vary depending on your specific network firewall or router model. It's recommended to consult the user manual or contact the manufacturer for detailed instructions or support.