• Kaushal Patel


Hello Readers ! Today I am giving you an overview of FIREWALL.

Here I am giving you a short note on 8 different types of firewall available based on infrastructure.

Types Of Firewall
  1. Packet-Filter Firewall

  2. Circuit-Level Gateways Firewall

  3. Stateful Inspection Gateways Firewall

  4. Application - Level Gateways Firewall (Proxy Firewalls)

  5. Next - Generation Firewall

  6. Software Firewall

  7. Hardware Firewall

  8. Cloud Firewall

* Last 3 are the method of delivery Firewall Functions

Packet-Filter Firewall

- Basic Firewall

- Inspect info like, source, destination IP ADD, Packet types, Port numbers

- Inspect without opening up the packets contain

- Good thing about this firewall is they don't have huge impact on

system performance or network performance

- Terrible thing is that, it is easy to bypass for penetrating or inject payloads

Circuit - Level Gateways Firewall

- Simplistic Firewall

- Deny traffic without consuming significant computing resources

- It is verifying the TCP Handshake

- TCP packet is from Legitimate(Allowed by rules or laws)

Stateful Inspection Firewalls

- This firewall combine both packet inspection technology and

TCP Handshake verification

- This may slow down the transfer of legitimate packets

Application - Level Firewall(Proxy Firewalls)

- Also considered as Cloud Firewall

- Firewall delivered via cloud-based solution or other proxy devices

- Similar to stateful inspection Firewall

- Perform deep-layer packet inspection

- Check contents of the information in packets to verify the

Malware or Payloads

- Drawback is, it can create significant slow-down the network or systems

because of extra step to inspect packet transfer process

Next-Generation Firewall

- Firewall architectures include deep-packet inspection

- Check actual content of packets and TCP Handshake, surface-level packet


- Include technology such as IPS(Intrusion Prevention System)

- Automatically stop attacks against network

- Issue is that no-one define of Next-Generation firewalls

- So, important to specific check the capabilities of firewall before investing

or buying this types of firewalls

Software Firewall

- Big benefits of this firewall is,

- Highly useful for creating defense in depth by Isolation individual

Network endpoints from one another

- Difficult to maintain due to not supporting each and every network


Hardware Firewall

- Physical Appliances

- Major weakness of a hardware based firewall is that, - Hardware

- It is easy for insider attackers to bypass them

- Actual capabilities of a hardware firewall may vary depending on


Cloud Firewall

- Cloud solution services used a firewall that deliver the cloud based firewall

Called Cloud-Firewall.

- FaaS (Firewall as a Service)

- Similar to proxy firewall

- Cloud-Server is often used a proxy firewall setup

- Benefits, Easy to scale with your Organization

- Additional capacity to the cloud server to filter large traffic loads.

Here are the list of Firewall available according to Infrastructure.

Now, I am going to discuss the best practices of Firewall deployment

Five Best Practices for Firewall Deployment

  1. Regular check and update firewall configuration settings

  2. Make sure there aren't any modems in your internal network

  3. Use Multiple firewall types

  4. use deep=packet inspection methods

  5. Don't just rely on Firewalls

  6. use antivirus programs

  7. data backups, disaster recovery plan

  8. strong password methods

  9. multifunction authentication

  10. perform periodic penetration testing

Thanks for reading, I hope you like this blog.

Happy Learning!!!

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