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I was trying to build a firewall where in the access to my LAN from internet should be allowed only if it matches the predefined MAC address of the device i.e. MAC filtering, but later i found out that MAC filtering is not possible for the traffic coming from the internet, since it changes the MAC address of a packet for every hop(This is my understanding as far as i have read on the internet,please do correct me if I am wrong), please do suggest some alternative or solution, so that the traffic from only predefined MAC addresses are allowed to access the LAN.
I tried experimenting with linux's utility iptables Any suggestions and corrections are greatly welcomed:-). As others have already noted, filtering by MAC doesn't work because MAC addresses are not routable, only IP adresses are. Filtering by MAC address wouldn't really work, anyway, because MAC addresses can be easily spoofed (changed).
I can give my computer the same MAC address yours has, and as long as they're not on the same network segment, everything continues working just fine, except that if there was a way to look at the MAC address of a request in a routed network, I'd now look just like you. What you can do is filter IP addresses by IP address block. There are services that provide geolocation services based on IP addresses; usually whole blocks of IP addresses are assigned to specific institutions.
So you could in theory lock out anyone from china by blocking all IPs registered to chinese internet providers, chinese firms etc. This won't be foolproof, however, because a) the geolocation lists are never perfectly accurate and perfectly up to date, and b) there are services such as proxies, VPNs and anonymization networks which can hide the actual origin IP of a request. You'll have a bit more success if you whitelist IP blocks.
For example, if you want people at your school to have access to your network service, but nobody else, you can whitelist the IP block assigned to your school. But again, you should only consider this a first step. It also doesn't allow you to grant access to individual persons; IP addresses for the most part can't be reliably tied to people. So if you really want to only allow specific persons / computers into your network, you'll have to secure it with an authentication and authorization step. For example, you could set up your own VPN and hand out access credentials to only those people whom you want to be able to access it. EDIT Abdul clarified that he needs to secure access to the home automation system in which only the intended user or authorize person can control.
In regards to that, you are going to want to use openSSH with key authentication. Key authentication is going to be exponentially more secure than password authentication. You will be generating public and private keys using RSA in which your intended user will hold his private key to authenticate. He will be the only to hold this private key. As you mentioned, IP address can change and so can MACs if they are spoofed so using RSA keys are going to be the solution to this.
Research SSH and public and private key pairs. Checkout this link: Unfortunately this is not going to be possible. MACs are used with a LAN and in the Layer 2 of the TCP/IP hybrid model. When internet comes into the picture you are now dealing with Layer 3 IP addresses. MAC filtering is only going to work within your own LAN.
With firewalls you are going to be looking at using ACLs (Access control lists) which is going to filter traffic based on IP(Layer 3) address. When a packet is traveling through a network, at each hop the MAC destination and source will being changing but the IP source and destination will always stay the same. This is one reason MAC filtering is not going to work across the internet. If you can provide a specific reason you are trying to do this then it could change things for example if the device is sitting on another LAN that you are in control of you can setup certain technologies to accomplish this. Thanks a lot for replying! Let me make it clear, I am working on my final sem project, which is to secure the path and prevent illegitimate access to the home automation system, where in only the intended user such as the home owner /any other authorized person can control the home appliances from the internet when they are away from home or not within the wifi limits to access to home automation system.
If iam not wrong ACLs will work only when the IP address is static, if iam trying to access the system from internet then the IP will be dynamic right? – Mar 12 '17 at 8:55.
I did little research on what openssh is & found out that the client initiates a request and the server will respond to it and the secure connection is established! In my case the client will be the owner who is trying to access the home automation system from the internet, to make this happen i should install openssh on my home server,since the public ip address i get will be dynamic(i will be using the port forwarding mechanism to access specific devices on the home network), how do i tackle this issue and make sure that the client reaches the correct home automation system everytime! – Mar 12 '17 at 17:09.
In networking, the term firewall means a system that enforces an access control policy between networks. This control policy can include options such as a packet filtering router, a switch with VLANs, and multiple hosts with firewall software. A firewall system can be a composition of many different devices and components. One crucial component of a firewall is traffic filtering, which is what is mostly referred to as a firewall. A firewall could be likened to the metal sheet that separates the engine compartment of a vehicle or aircraft from the passenger area.
Basically, the term firewall was adapted for use with computer networks; firewall is applied or configured on a network to prevent uninvited traffic from entering or gaining access to prescribed areas within a network. The original firewalls were not standalone devices, but routers or servers with software features added to provide firewall functionality. Over time, several companies developed standalone firewalls.
Dedicated firewall devices enabled routers and switches to offload the memory- and processor-intensive activity of filtering packets. Modern routers, such as the Cisco Intergrated Service Routers(ISRs), also can be used as sophisticated stateful firewalls for organizations that may not require a dedicated firewall. Features of Firewalls Firewalls share some common properties: i. Resistant to attacks ii. Only transit point between networks. (all traffic flows through the firewall) iii.
Enforces the access control policy How Firewall Works Types of Firewalls. Stateless Firewall.
The early firewalls were created to inspect packets to verify if they matched sets of rules, with the option of forwarding or dropping the packets accordingly. This type of packet filtering is known as stateless filtering, each packet is filtered based solely on the values of certain parameters in the packet header, similar to how ACLs (access control lists) filter packets. Stateful Firewall. The first stateful firewall appeared in 1989, it was developed by AT&T Bell Laboratories.
This type of firewalls filter packets on information stored in the firewall based on data flowing through the firewall. The stateful firewall is able to determine if a packet belongs to an existing flow of data.
They help to mitigate DoS attacks that exploit active connections through a networking device. Stateful filtering provides dynamic packet filtering capabilities to firewalls. It operates at the Network Layer of the OSI, although for some applications it can also analyze traffic at Layer 4 and Layer 5. Packet-filtering Firewall. This can be in a form of a router with the capacity to filter some packet content, such as Layer 3 and sometimes Layer 4 information.They permit and deny based on Layer 4 information such as protocol, and source and destination port numbers.
Packet filtering firewall uses access control lists (ACLs) to determine whether to permit or deny traffic, based on source and destination IP addresses, protocol,source and destination port numbers, and packet type. Packet-filtering firewalls are usually part of a router firewall.
Application Gateway Firewall or Proxy Firewall. A type of firewall that filters information at Layers 3, 4, 5, and 7 of the OSI reference model. Most of the firewall control and filtering is done in software. Address-translation firewall. A type of firewall that expands the number of IP addresses available and conceals network addressing design. Host-based firewall. A PC or server with firewall software running on it.
Transparent firewall. A firewall that filters IP traffic between apair of bridged interfaces. Hybrid firewall A firewall that is a combination of the various firewalls types. For example, an application inspection firewall combines a stateful firewall with an application gateway firewall. All rights reserved. The information provided on this website is for informational purposes only.
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