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Access Control Lists (ACLs) For Network Security

Access Control Lists (ACLs) For Network Security

Majority of the time, the traffic that flows in and out of networks is accompanied with security threats. To do away with these developing threats, all network administrators require techniques for denying unwanted access to networks and only allow access to authorized and trusted users. There is a wide range of security tools ranging from physicals devices to passwords that facilitate internet access control. This have been helpful in the past but with network attackers devising new ways of bypassing the old techniques, there is a need for advanced internet control tools. These tools enable network administrators to define the users that can access a network or entire LAN resources. Access Control Lists (ACL) presents a list of protocols and conditions that are used in checking the network traffic travelling over the interface of a router. Internet access control is vital for all network users so as to do away with unauthorized access of particular sites.

Business owners can protect their businesses by use of ACLs that aid in telling a router the kind of packets to deny or accept but this is normally based on particular conditions. For instance, Cisco routers are capable of filtering traffic and can even block traffic from another network or the internet. ACL offers a great way of controlling the traffic that comes in and out of a network offering you an excellent internet access control tool. You can also configure the ACLs for the entire network protocols that have been routed. There are various types of ACLs such as the complex, extended and standard lists and they are all utilized as protocols for controlling the traffic on a network. The control is based on the Transfer Control Protocol (TCP) port in use; it is basically part of the solution for internet security.

These Lists work by guarding what enters and leaves a network. As a guard, the List only allows what appears on the list to be accessed. It basically filters what can be accessed basing on the condition that the name is on the authorized list. This is how this form of internet access control works; when a packet reaches the router, some information is extracted from the header of the packet by the router. After this, basing on the filtering rules, the router decides if the packet is passable or if it should be dropped. The packet filtering process normally takes place in the Internet Layer of the TCP/IP or Network layer of the OSI (Open System Interconnection) model.

In summary, the ACL extracts particular information from packet headers after which they test the info against their rules. It is after this that the ‘deny’ or ‘access’ decision is made basing on the type of ICMP messages, the source and destination IP address and the TCP/UDP destination and source port. Internet access control is of essence for any business as it aids in controlling the users that can access a network. It also aids in controlling operating system resources. Internet access control entails the control of downloaded material to ensure adware and spyware applications are avoided since only permitted users will access the computer and will only access what is permitted. The internet access control concept generally enables business owners to keep track of what takes place on organizational networks and control the entire network operations.

Source by Samuel J Brown

Posted by brainiac / Posted on 18 Aug
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