How to Break a Firewall (Bypass Techniques)

How to Break a Firewall (Bypass Techniques)

How to Break a Firewall (Bypass Techniques)

Firewall bypass techniques

If you need a refreshing of basics of firewall systems, see below. For now, we will be going over firewall bypass techniques to help you get past those filters and into network resources or other private data. We will have three different methods for firewall bypass: mac spoofing, teredo tunneling, port forwarding via UPnP, and ARP spoofing etc.

Mac Spoofing

A firewall can be beaten by a technique known as MAC (or Media Access Control) spoofing. This is a term that refers to the unique hardware address of your network card (MAC). If you change this, and then connect, it will bypass firewall restrictions since the firewall cannot tell it’s not an allowed computer trying to get in.

Teredo Tunning

Teredo tunneling is a firewall bypass technique that works on firewall systems with Network Address Translation (NAT). This firewall bypass technique creates a way for computers that are behind firewall systems to access the internet.

Essentially, you can think of it as constructing your own mini-tunnel between your computer and another computer on the other side of the firewall. The Teredo protocol works by sending packets through this tiny tunnel until they reach their destination .

Port forwarding via UPnP

(Universal Plug and Play)) is one of the firewall bypass techniques that work on different firewall configurations. This firewall bypass technique uses a UDP port (port 49152) to forward connections from outside into inside networks. The firewall filter should allow this specific outgoing connection, but it makes sense for us to check our firewall configuration and make sure we don’t have any filters interfering with this firewall bypass technique.

Arp Spoofing

A firewall bypass technique that works on some firewall implementations. In short, Arp spoofing is a method of poisoning the ARP cache on a network router or host so as to cause traffic meant for one system to be sent instead to another (hostile) system. This can simply be done by sending unsolicited messages over the local area connection in order to trick a system into thinking it is talking to the firewall when in fact its traffic was sent by an attacker.

ARP spoofing is used to change a host’s ARP table, which is used for mapping IP addresses to MAC (Media Access Control) addresses. This firewall bypass method works by sending falsified packets that contain spam or malicious content .

Man in the middle attack

A firewall bypass technique that involves an attacker intercepting and modifying the packets sent back and forth between two parties. This is done so as to fool one or both of them into revealing sensitive information such as usernames, passwords, credit card numbers etc.

What is a firewall?

Firewall is a piece of software or hardware that controls what data can enter and leave a network. From blocking unapproved websites to stopping access from certain countries, firewall systems exist for many reasons.

A firewall’s main job is to block unauthorized visitors and keep them out of private networks where sensitive information might exist in databases or other files that would otherwise be at risk to cyber attacks.

This is mostly used to keep unknown users from accessing potentially sensitive information on your computer, but it can also be used as an easy way for you to grant yourself access if you know how!

Where can a firewall device be found?

A firewall device can be found in a number of locations. They are used by many businesses, schools, and even homes to keep unwanted visitors out of their system or network. Some examples include: internet service providers (ISPs), wireless routers for home networks, offices with shared computers on an internal network, etc.

Potential people who are trying to break into your system

A white hat hacker is a skilled computer expert who uses their knowledge to find security flaws in software and applications. White hat hackers may work for companies or organizations, but many are employed as freelancers by various agencies and clients. For example, an ethical hacker could be hired to attack a company’s firewall. White hat hackers are those that work within computer security companies in order help keep systems safe from attacks

A black hat hacker is the opposite of a white hat and has been known to also be referred to as an “elite” or even just hackers in general. Black hats are usually involved with criminal activity such as stealing credit card information or other illegal means of gaining money

What are the types of firewall?

The firewall bypass techniques that we will be going over work on different firewall configurations. There are three main types of firewall filters: stateful, proxy-based, and packet filter based.

  1. Stateful – These types of firewalls keep track of all the traffic traveling in and out through them by requiring requests to match up with response packets from the firewall.
  2. Proxy-based – This firewall requires a request to go through an intermediary proxy server that is transparently intercepting and redirecting traffic in order to filter it before passing the data back out.
  3. Packet Filter based – Filtering at this level occurs on each packet, providing very granular control of what can pass through. However, it also requires the firewall to maintain state for each connection.

Ways to detect a firewall

  1. NMAP scan – The firewall detection and firewall bypass NMAP scripts can be used to detect if firewall is in place on a system by probing the firewall. If firewall is detected, the script can also bypass firewall.
  2. Hping scan – A firewall bypass tool that works by sending different packets to the firewall. The firewall then responds with an ICMP message and this lets you know if there is any sort of firewall running on it or not. This can be useful in determining what type of firewall system someone has put up, as well as how effective your firewall bypass technique will work on it.


There are many other ways to bypass firewalls. The internet is full of these firewalls so knowing how to get past them will come in handy for sure! Although we have gone over some of the most popular firewall bypass techniques, there are always going to be new ones popping up all the time. It’s your job to stay on top of firewall bypass techniques and software updates so that you can always have the upper hand.

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