Firewall Security Management

Firewall Security Management

20 TOP MOST PROBLEMS IN FIREWALLS WHICH IMPACT BUSINESS More »

Firewall Security Management

Firewall Security Management

Firewall Hardening Checklist More »

Firewall Security Monitoring

Firewall Security Monitoring

Giving You a Proactive Approach to Your Cyber security with Security Monitoring More »

Best TOP Enterprise Network Firewalls

Best TOP Enterprise Network Firewalls

List of Top Firewall Providers Company / Companies in India More »

 

Category Archives: What is a firewall

List of Top Firewall Companies in India

Firewall Support

List of Top Firewall Companies in India

List of Top Firewall Companies in India

In general, a computer appliance is a computing device with a specific function and limited configuration ability, and a software appliance is a set of computer programs that might be combined with just enough operating system (JeOS) for it to run optimally on industry standard computer hardware or in a virtual machine.

A firewall appliance is a combination of a firewall software and an operating system that is purposely built to run a firewall system on a dedicated hardware or virtual machine. These include:

  • embedded firewalls: very limited-capability programs running on a low-power CPU system,
  • software-based firewall appliances: a system that can be run in independent hardware or in a virtualised environment as a virtual appliance
  • hardware-based firewall appliances: a firewall appliance that runs on a hardware specifically built to install as a network device, providing enough network interfaces and CPU to serve a wide range of purposes. From protecting a small network (a few network ports and few megabits per second throughput) to protecting an enterprise-level network (tens of network ports and gigabits per second throughput).

Firewall software

Some firewall solutions are provided as software solutions that run on general purpose operating systems. The following table lists different firewall software that can be installed / configured in different general purpose operating systems.

 
Firewall License Cost and usage limits OS
Avast Internet SecurityProprietaryPaidMicrosoft Windows
Comodo Internet SecurityProprietaryFreeWindows 10/8.1/8/7/Vista x32/x64, XPx32
Intego VirusBarrierProprietaryPaidMac OS X 10.5 or later; on an Xserve
Kaspersky Internet SecurityProprietaryPaid / 30 day trialWindows unknown versions x32/x64
Lavasoft Personal FirewallProprietaryPaidWindows unknown versions x32/x64
Microsoft Forefront Threat Management GatewayProprietaryDiscontinuedWindows unknown versions x64
NetLimiterProprietaryPaidWindows 10, 8, 7 x64
Norton 360ProprietaryPaidWindows unknown versions x32/x64
Online Armor
Personal FirewallProprietaryDiscontinuedWindows unknown versions x32/x64
Outpost
Firewall ProProprietaryDiscontinuedWindows 10, 8, 7, Vista, XP x32/x64
PC Tools
Firewall PlusProprietaryDiscontinuedWindows unknown versions x32/x64
Sygate
Personal FirewallProprietaryDiscontinuedWindows unknown versions x32
Windows FirewallProprietaryIncluded with Windows
XP SP2 and laterALL Windows Versions x32/x64
ZoneAlarmProprietaryFree / PaidWindows 7 / Vista / XP SP3/ Windows 8, 8.1. 10 x32/x64
Netfilter/iptablesGPLFreeLinux kernel module
nftablesGPLFreeLinux kernel (>=3.13) module
ShorewallGPLFreeLinux-based appliance
PeerBlockGPLFreeWindows 8/8.1, 7, Vista x32/64
NPFBSDFreeNetBSD kernel module
PFBSDFree*BSD kernel module
ipfirewallBSDFree*BSD package
IPFilterGPLv2FreePackage for multiple UNIX-like operating systems

Firewall appliances

In general, a computer appliance is a computing device with a specific function and limited configuration ability, and a software appliance is a set of computer programs that might be combined with just enough operating system (JeOS) for it to run optimally on industry standard computer hardware or in a virtual machine.

A firewall appliance is a combination of a firewall software and an operating system that is purposely built to run a firewall system on a dedicated hardware or virtual machine. These include:

embedded firewalls: very limited-capability programs running on a low-power CPU system,
software-based firewall appliances: a system that can be run in independent hardware or in a virtualised environment as a virtual appliance hardware-based firewall appliances: a firewall appliance that runs on a hardware specifically built to install as a network device, providing enough network interfaces and CPU to serve a wide range of purposes. From protecting a small network (a few network ports and few megabits per second throughput) to protecting an enterprise-level network (tens of network ports and gigabits per second throughput).

The following table lists different firewall appliances.

FirewallLicenseCostOS
ClavisterProprietaryIncluded on all ClavisterProprietary operating system cOS Core
NGFWs
Check PointProprietaryIncluded on Check PointProprietary operating system Check Point IPSO
security gatewaysand Gaia (Linux-based)
FortiGateProprietaryIncluded on all FortigateProprietary, FortiOS
devices
Palo Alto NetworksProprietaryIncluded on Palo AltoProprietary operating system PANOS
Networks firewalls
SophosProprietaryIncluded on Sophos UTMLinux-based appliance
Cisco ASA FirepowerProprietaryIncluded on all CISCOProprietary operating system
ASA devices
Cisco PIXProprietaryIncluded on all CISCOProprietary operating system
PIX devices
Juniper SSGProprietaryIncluded on NetscreenProprietary operating system ScreenOS
security gateways
Juniper SRXProprietaryIncluded on SRXProprietary operating system Junos
security gateways
SonicwallProprietaryIncluded on Dell applianceProprietary operating system SonicOs
Barracuda FirewallProprietaryIncluded Firewall Next Generation applianceWindows-based appliance
embedded firewall distribution
CyberoamProprietaryIncluded Firewall Sophos applianceWindows-based appliance
embedded firewall distribution
D-LinkProprietaryIncluded Firewall DFLWindows-based appliance
embedded firewall distribution
Endian FirewallProprietaryFree / PaidLinux-based appliance
Forcepoint NGFWProprietaryIncluded on all Forcepoint NGFW devicesProprietary operating system
OPNsenseSimplified BSD / FreeBSD LicenseFree / PaidFreeBSD-based appliance
firewall distribution
pfSenseESF/Apache 2.0Free / PaidFreeBSD-based appliance
firewall distribution
UntangleGPLFree / PaidLinux/NanoBSD-based appliance
firewall distribution
ZeroshellGPLFree / PaidLinux/NanoBSD-based appliance
firewall distribution
SmoothWallGPLFree / PaidLinux-based appliance
embedded firewall distribution [4]
WinGateGPLFree / PaidWindows-based appliance
embedded firewall distribution

 

For Any type of Firewall Security and Support, Please call us on

Sales :+91 958 290 7788
Support : 0120 2631048

Register & Request Quote
Submit Support Ticket

List of TOP Firewall Appliances Company in India

List of TOP Firewall Appliances Company in India

In general, a computer appliance is a computing device with a specific function and limited configuration ability, and a software appliance is a set of computer programs that might be combined with just enough operating system (JeOS) for it to run optimally on industry standard computer hardware or in a virtual machine.

A firewall appliance is a combination of a firewall software and an operating system that is purposely built to run a firewall system on a dedicated hardware or virtual machine. These include:

  • embedded firewalls: very limited-capability programs running on a low-power CPU system,
  • software-based firewall appliances: a system that can be run in independent hardware or in a virtualised environment as a virtual appliance
  • hardware-based firewall appliances: a firewall appliance that runs on a hardware specifically built to install as a network device, providing enough network interfaces and CPU to serve a wide range of purposes. From protecting a small network (a few network ports and few megabits per second throughput) to protecting an enterprise-level network (tens of network ports and gigabits per second throughput).

The following table lists different firewall appliances lists.

FirewallLicenseCostOS
Check PointProprietaryIncluded on Check Point
security gateways
Proprietary operating system Check Point IPSO
and Gaia (Linux-based)
FortiGateProprietaryIncluded on all Fortigate
devices
Proprietary, FortiOS
Palo Alto NetworksProprietaryIncluded on Palo Alto
Networks firewalls
Proprietary operating system PANOS
WatchGuardProprietaryIncluded on all
WatchGuard firewalls
Proprietary operating system
SophosProprietaryIncluded on Sophos UTMLinux-based appliance
Cisco Asa FirepowerProprietaryIncluded on all CISCO
ASA devices
Proprietary operating system
Cisco PIXProprietaryIncluded on all CISCO
PIX devices
Proprietary operating system
Mcafee FirewallProprietaryIncluded on Intel Security ApplianceLinux-based appliance
Juniper SSGProprietaryIncluded on Netscreen
security gateways
Proprietary operating system ScreenOS
Juniper SRXProprietaryIncluded on SRX
security gateways
Proprietary operating system Junos
SonicwallProprietaryIncluded on Dell applianceProprietary operating system SonicOs
Barracuda FirewallProprietaryIncluded Firewall Next Generation applianceWindows-based appliance
embedded firewall distribution
CyberoamProprietaryIncluded Firewall Sophos applianceWindows-based appliance
embedded firewall distribution
D-LinkProprietaryIncluded Firewall DFLWindows-based appliance
embedded firewall distribution
Endian FirewallProprietaryFree / PaidLinux-based appliance
Opendium IceniProprietaryFree / PaidLinux-based, with optional web filtering / auditing.
IPCopGPLFree / PaidLinux-based appliance
firewall distribution
pfSenseESF/BSDFree / PaidFreeBSD-based appliance
firewall distribution
IPFireGPLFree / PaidLinux/NanoBSD-based appliance
firewall distribution
UntangleGPLFree / PaidLinux/NanoBSD-based appliance
firewall distribution
ZeroshellGPLFree / PaidLinux/NanoBSD-based appliance
firewall distribution
SmoothWallGPLFree / PaidLinux-based appliance
embedded firewall distribution
WinGateGPLFree / PaidWindows-based appliance
embedded firewall distribution
Calyptix SecurityBSDFreeOpenBSD-based appliance
firewall distribution
Halon SecurityBSDFreeOpenBSD-based appliance
VantronixBSDFreeOpenBSD-based appliance

 

For more details just call or email us on
Phone:+91 9582907788 Email: sales@itmonteur.net

Firewall Company

Firewall Company

Firewall Company

Firewall Company

Security must be integral, not an afterthought.

40% of all cyber-attacks target businesses with fewer than 500 employees!

More than 40% of SMBs don’t have an adequate IT security budget!

SMBs on average lose $188,242 to a cyber attack and almost 66% of victimized companies are forced out of business within six months of being attacked.

Only 26% of small and midsize businesses were confident their firm has enough in-house expertise for a strong security posture

Despite the threat that data loss poses to SMBs, 70% thought their companies would have difficulty detecting a breach

Did you know the average breach goes undetected for 229 days?

The smart solution for intelligent businesses

Regardless of the size of your business, you want to be assured of the security of your computers and networks. IT Monteur Firewall Firm team can ensure your business has around the clock firewall and virus protection, guaranteeing your network is free from intrusion, spyware and hackers 24/7.

Many small business owners feel safe from attack, mistakenly thinking hackers only target large corporations. The fact is that many cyber criminals see smaller businesses as ideal targets due to their minimal security measures, and often use those smaller businesses to gain access to the networks of larger companies.

Security at all levels of I.T. is vital to ensure you aren’t seen as an easy target. It isn’t something you want to address once your systems have been compromised. IT Monteur Firewall Firm can assist, with integrated firewalls, network and desktop security solutions, virus protection, spam filtering, adware, spyware protection and much more.

Business Security Facts:

    • Yes, you will be attacked, even though you’re small
    • In fact, small businesses are attacked more than enterprises due to their lower security budgets and expertise, both of which equate to greater vulnerability.
    • Cyber criminals gain access to larger corporations through small business networks.
    • Security must be integral, not an afterthought.
    • UTM (Unified Threat Management) is no longer enough.
    • Wired & Wireless need common security policy.

Partnering with IT Monteur Firewall Firm means:

  • Installation and integration of firewall into the network
  • 24/7 Protection, Monitoring and Threat Response of all access points to your network, offering complete security from outside threats
  • Endpoint Security anti-virus protection safeguards your network from viruses, worms, and other malicious code threats
  • Spam protection through message and e-mail filtering
  • Dedicated Security Team
  • Onsite support as needed
  • Integrated Security with Business Focus

List of Firewall appliances Company in India

When any enterprise or small medium business start thinking of a network management & security, the first thing to come up in  the mind of IT Managers is a good and secure firewall. Firewalls are the first layer of defense in a network, as a system without the basic layer of security is intended to reveal the sensitive data for enterprise users.

A firewall is a combo of a firewall software and operating system that is built to run a firewall system on a dedicated hardware or virtual machine which includes :

  • Embedded firewalls: very limited-capability programs running on a low-power CPU system,
  • Software firewall appliances: a system that can be run in independent hardware or in a virtualised environment as a virtual appliance
  • Hardware firewall appliances: Hardware firewall is specifically built to install as a network device, providing enough network interfaces and CPU to serve a wide range of purposes. From protecting a small network to protecting an enterprise-level network.

below is the list of Top Firewall Companies in India : 

  • Check Point
  • FortiGate
  • Palo Alto Networks
  • WatchGuard
  • Sophos
  • Cisco Asa Firepower
  • Cisco PIX
  • Mcafee Firewall
  • Juniper SSG
  • Juniper SRX
  • Sonicwall
  • Barracuda Firewall
  • Cyberoam
  • D-Link
  • Endian Firewall
  • Opendium Iceni
  • IPCop
  • pfSense
  • IPFire
  • Untangle
  • Zeroshell
  • SmoothWall
  • WinGate
  • Calyptix Security
  • Halon Security
  • Vantronix

Firewall Company Security Solution

Security solutions at IT Monteur is aimed to protect your business from hackers attack and other Internet threats. We aim at running your business smooth without any worry about securing your data. IT Monteur a Firewall Company in Delhi India, provides firewall software and hardware firewall to protect your data from any mallacious attacks and unexpected crises.

Firewall Software and Hardware Firewall solutions are both designed to block unauthorized access to computers in your network. A firewall software program is installed on each individual PC it’s meant to protect. To safeguard all your company’s computers, however, each one must have a software firewall installed. This can become expensive and difficult to maintain and support. But, a hardware-based firewall is easier to maintain and administer than individual software firewalls. It protect all the computers on your network.

Our firewall security solutions is Combined network and physical security for a more comprehensive approach that meets your needs and that allows you to add integrated protection from hackers, spam, malicious websites, identity theft.

we provide secure access to enable workers at home, at remote sites, or traveling to connect to your business safely and securely Secure storage that gives you the flexible capacity to protect and back up data, video, and images and also provide Physical protection to guard your business and your employees from theft, vandalism, and unlawful access.

Our firewall security solutions Key features:

  • Standard firewall capabilities: Packet filtering, network address translation (NAT), stateful protocol inspection, Virtual Private Networking
  • Integrated Network Intrusion Prevention (IPS)
  • Application Awareness and Control
  • Additional Intelligence: Directory integration to tie security policies to users and groups; cloud-based reputation services to stop traffic from dangerous sources
  • Real-time and historical visibility into user, network, and security activity

We are also providing UTM ( Unified threat management ) Firewall Solutions for SMB & Enterprices

Firewalls, both hardware and software, protect computers from hackers and other online threats by blocking dangerous pieces of data from reaching the system. While hardware firewalls offer network-wide protection from external threats, software firewalls installed on individual computers can more closely inspect data, and can block specific programs from even sending data to the Internet. On networks with high security concerns, combining both kinds of firewalls provides a more complete safety net.

We are providing UTM ( Unified threat management ) Best Firewall Solutions for SMB & Enterprises Companies in India

Please Contact us for all type of Cyberoam Firewall Quick Heal TerminatorSonicwallNetGenieJuniper , Gajshield , Checkpoint  ,  WebsenseBluecoatBarracudaCisco Firewall, Watch Guard Firewall, Fortigate Firewall security solutions & Price. We provide support for setup of Virtual Private Network ( VPN ), Branch Office VPN and VPN Management Services.

Cisco Firewall, Watch Guard Firewall, Fortigate Firewall, Firewall companies in India, Firewall company India, firewall installation company in delhi, firewall solutions, hardware based firewall provider, network firewall India

Best business firewalls: Which firewall is suitable for your business?

Best business firewalls: Which firewall is suitable for your business?

There are countless options to choose from when considering firewall protection. Should you invest in an external firewall, stick with a virtual firewall or take the plunge with both?

The firewalls listed here cater to most sizes of organisation, from small businesses that only require virtual firewalls to larger enterprises that should house external firewall hardware.

With recent data breaches highlighting the importance of securing your network, IT Monteur Firewall Firm investigates the best firewalls on the market for every business’ first line of defence.

Firewalls – Buyer’s Guide and Reviews – March 2018

A10 Networks
A10 Networks Thunder CFW
Barracuda Networks
Barracuda Networks NG Firewall
Check Point
Check Point Power-1
Check Point
Check Point UTM-1
Check Point
Check Point VPN-1
Check Point
Check Point VSX
Cisco
Cisco Sourcefire Firewalls
Cisco
Cisco ASA
Cisco
Meraki MX Firewalls
Cisco
Cisco Firepower NGFW
Cisco
Cisco ASAv
Fortinet
Fortinet FortiGate
Fortinet
FortiGate-VM
GFI
Kerio Control
Hewlett Packard
Enterprise
3Com H3C Firewall
Hillstone Networks
Hillstone E-Series
Hillstone Networks
Hillstone T-Series
Hillstone Networks
Hillstone X-Series Data Center Firewalls
Hillstone Networks
Hillstone CloudEdge
Intel Security
Intel Security StoneGate
Intel Security
Intel Security Firewall Enterprise MFE
Juniper
Juniper SRX
NetFortris
NetFortris Hosted Firewall
NetFortris
NetFortris Threat Analyzer
OPNsense
OPNsense
Palo Alto Networks
Palo Alto Networks WildFire
Palo Alto Networks
Palo Alto Networks VM-Series
pfSense
pfSense
SonicWall
SonicWall TZ
SonicWall
SonicWall NSA
Sophos
Sophos Cyberoam UTM
Sophos
Sophos UTM
Sophos
Sophos XG
Stormshield
Stormshield Network Security
Trustwave
Trustwave Firewalls
Untangle
Untangle NG Firewall
WatchGuard
WatchGuard XTM
WatchGuard
WatchGuard Firebox
Zscaler
Zscaler Web Security

Top Firewalls Solutions

1Fortinet FortiGate
The FortiGate family of NG firewalls provides proven protection with unmatched performance across the network, from internal
segments, to data centers, to cloud environments. FortiGates are available in a large range of sizes and form factors and are key
components of the Fortinet Security Fabric, which enables immediate, intelligent defense against known and new threats
throughout the entire network
2Cisco ASA
Adaptive Security Appliance (ASA) is Cisco’s end-to-end software solution and core operating system that powers the Cisco ASA
product series. This software solution provides enterprise-level firewall capabilities for all types of ASA products, including blades,
standalone appliances and virtual devices. Adaptive Security Appliance provides protection to organizations of all sizes, and
allows end-users to access information securely anywhere, at any time, and through any device.Adaptive Security Appliance is
also fully compatible with other key security technologies, and so provides organizations with an all-encompassing security
solution.
3Sophos UTM
The global network of highly skilled researchers and analysts, protecting businesses from known and emerging malware – viruses,
rootkits and spyware.
4pfSense
Providing comprehensive network security solutions for the enterprise, large business and SOHO, pfSense solutions bring
together the most advanced technology available to make protecting your network easier than ever before. Our products are built
on the most reliable platforms and are engineered to provide the highest levels of performance, stability and confidence.
5Palo Alto Networks WildFire
WildFire™ cloud-based threat analysis service is the industry’s most advanced analysis and prevention engine for highly evasive
zero-day exploits and malware. The cloud-based service employs a unique multi-technique approach combining dynamic and
static analysis, innovative machine learning techniques, and a groundbreaking bare metal analysis environment to detect and
prevent even the most evasive threats.
6Sophos Cyberoam UTM
Cyberoam Unified Threat Management hardware appliances offer comprehensive security to organizations, ranging from large
enterprises to small and branch offices. Multiple security features integrated over a single, Layer 8 Identity-based platform make
security simple, yet highly effective.
7SonicWall TZ
The secure, sophisticated SonicWALL TZ is widely deployed at small businesses, retail, government, remote sites and branch
offices. It combines high-performance intrusion prevention, malware blocking, content/URL filtering and application control.
8Meraki MX Firewalls
With the proliferation of modern applications and mixed-use networks, host and port based security is no longer sufficient. Cisco
Meraki’s layer 7 “next generation” firewall, included in MX security appliances and every wireless AP, gives administrators
complete control over the users, content, and applications on their network.
9WatchGuard XTM
Small businesses need big security, too, and the WatchGuard XTM Series firewall/VPN appliances deliver that strong protection Ð
but without the hefty price tag. Enterprise-grade security includes full HTTPS content inspection, VoIP support, and optional
security subscriptions like Application Control and Intrusion Prevention Service.
10Juniper SRX
High-performance security with advanced, integrated threat intelligence, delivered on the industry’s most scalable and resilient
platform. SRX Series gateways set new benchmarks with 100GbE interfaces and feature Express Path technology, which enables
up to 1 Tbps performance for the data center.

For more details just call or email us on
Phone:+91 9582907788
Email: sales@itmonteur.net

Gajshield DLP Firewall

GAJSHIELD Next Generation Firewall Unique Context Sensitive Network based Data Leak Prevention System with Cloud Security

GAJSHIELD Next Generation DLP Firewall
Unique Context Sensitive Network based Data Leak Prevention System with Cloud Security

GAJSHIELD DLP Firewall

Next Generation DLP Firewall

Unique Context Sensitive Network based Data Leak Prevention System with Cloud Security

GajShield’s layered security platforms are designed to provide in depth protection against various attacks by tightly integrating key security functions and to securely connect remote offices and partners. GajShield Network Security Appliances combines ICSA Certified Firewall, IPS, VPN, URL Filtering, Virus screening and Bandwidth Management in a single appliance to provide in depth protection at the network edge.

ICSA Certified

  • User Sense UTM – Policy combination of User, Source, IP
  • address and Service
  • Policy based control for Firewall, IPS, URL Filtering,
  • Anti-virus, Anti-spam, DLP and Bandwidth Management
  • Access Scheduling
  • Policy based Source & Destination NAT
  • H.323 NAT Traversal, 802.1q VLAN Support
  • DoS, DDoS, Syn Flood Attack prevention

For SOHO specification

GS 15nuGS20nu
Firewall
– Concurrent Sessions1900003300000
– New Sessions/Second510028000
– Firewall Throughput230 Mbps3.2 Gbps
– VPN Throughput100 Mbps325 Mbps
– UTM Throughput170 Mbps280 Mbps
– Antivirus Throughput140 Mbps450 Mbps
– IPS Throughput160 Mbps720 Mbps
– VPN Tunnels25550
– Configurable WAN / DMZ / LAN portsYesYes
– 10/100 Interfaces44
– 10/100/1000 Interface

For SME

GS 80nu

GajShield ‘GS 40dc’ provides content aware data context, which helps you to secure your enterprise beyond next generation firewalls. The GajShield 40dc appliance is targeted at high speed Internet security device for SOHO/SMB. The 40dc appliance manages gigabit traffic with content aware data context platform providing enterprise grade security even to the smallest enterprise.

GS 40d c FEATURESSPEC IF ICAT IONS
10/100
10/100/10004
Concurrent Sessions320000
New Sessions Per Second8000
Firewall Throughput2.5 Gbps
VPN Throughput400 Mbps
UTM Throughput350 Mbps
AntiVirus Throughput425 Mbps
IPS Throughput475 Mbps
VPN Tunnels150
Configurable WAN/LAN/DMZ portscx Yes

For Enterprise

GS 130d c FEATURESGajShield 260d FeaturesGS 320dc-f  FeaturesGajShield 330d FeaturesGajShield 930d FeaturesGajShield 1030d Features
10/10061020/1620/16
10/100/10008244/84/8
Concurrent Sessions85000085000090000011000003000000
New Sessions Per Second26000260003000060000150000
Firewall Throughput5.5 Gbps5.5 Gbps7 Gbps20 Gbps25 Gbps
VPN Throughput1.9 Gbps1.9 Gbps2.5 Gbps12 Gbps15 Gbps
UTM Throughput1 Gbps1 Gbps2100 Mbps3.5 Gbps5 Gbps
AntiVirus Throughput1200 Mbps1200 Mbps2200 Mbps5.7 Gbps7.2 Gbps
IPS Throughput1500 Mbps1500 Mbps2400 Mbps9.5 Gbps11.5 Gbps
VPN Tunnels4000400060002000025000
Configurable WAN/LAN/DMZ portsyesYesYesYesYes

Gajshield Firewall Price

Gajshield DLP FirewallPrice

For more details just call or email us on
Phone:+91 9582907788
Email: sales@itmonteur.net

Firewall

What is a Firewall

A firewall is a network security system, either hardware- or software-based, that uses rules to control incoming and outgoing network traffic.

A firewall acts as a barrier between a trusted network and and an untrusted network. A firewall controls access to the resources of a network through a positive control model. This means that the only traffic allowed onto the network is defined in the firewall policy; all other traffic is denied.

History and types of firewalls

Computer security borrowed the term firewall from firefighting and fire prevention, where a firewall is a barrier established to prevent the spread of fire.

When organizations began moving from mainframe computers and dumb clients to the client-server model, the ability to control access to the server became a priority. Before firewalls emerged in the late 1980s, the only real form of network security was performed by access control lists (ACLs) residing on routers. ACLs determined which IP addresses were granted or denied access to the network.

The growth of the Internet and the resulting increased connectivity of networks meant that this type of filtering was no longer enough to keep out malicious traffic as only basic information about network traffic is contained in the packet headers. Digital Equipment Corp. shipped the first commercial firewall (DEC SEAL in 1992) and firewall technology has since evolved to combat the increasing sophistication of cyberattacks.

Packet firewalls

The earliest firewalls functioned as packet filters, inspecting the packets that are transferred between computers on the Internet. When a packet passes through a packet-filter firewall, its source and destination address, protocol, and destination port number are checked against the firewall’s rule set. Any packets that aren’t specifically allowed onto the network are dropped (i.e., not forwarded to their destination). For example, if a firewall is configured with a rule to block Telnet access, then the firewall will drop packets destined for TCP port number 23, the port where a Telnet server application would be listening.

Packet-filter firewalls work mainly on the first three layers of the OSI reference model (physical, data-link and network), although the transport layer is used to obtain the source and destination port numbers. While generally fast and efficient, they have no ability to tell whether a packet is part of an existing stream of traffic. Because they treat each packet in isolation, this makes them vulnerable to spoofing attacks and also limits their ability to make more complex decisions based on what stage communications between hosts are at.

Stateful firewalls

In order to recognize a packet’s connection state, a firewall needs to record all connections passing through it to ensure it has enough information to assess whether a packet is the start of a new connection, a part of an existing connection, or not part of any connection. This is what’s called “stateful packet inspection.” Stateful inspection was first introduced in 1994 by Check Point Software in its FireWall-1 software firewall, and by the late 1990s, it was a common firewall product feature.

This additional information can be used to grant or reject access based on the packet’s history in the state table, and to speed up packet processing; that way, packets that are part of an existing connection based on the firewall’s state table can be allowed through without further analysis. If a packet does not match an existing connection, it’s evaluated according to the rule set for new connections.

Application-layer firewalls

As attacks against Web servers became more common, so too did the need for a firewall that could protect servers and the applications running on them, not merely the network resources behind them. Application-layer firewall technology first emerged in 1999, enabling firewalls to inspect and filter packets on any OSI layer up to the application layer.

The key benefit of application-layer filtering is the ability to block specific content, such as known malware or certain websites, and recognize when certain applications and protocols — such as HTTP, FTP and DNS — are being misused.

Firewall technology is now incorporated into a variety of devices; many routers that pass data between networks contain firewall components and most home computer operating systems include software-based firewalls. Many hardware-based firewalls also provide additional functionality like basic routing to the internal network they protect.

Proxy firewalls

Firewall proxy servers also operate at the firewall’s application layer, acting as an intermediary for requests from one network to another for a specific network application. A proxy firewall prevents direct connections between either sides of the firewall; both sides are forced to conduct the session through the proxy, which can block or allow traffic based on its rule set. A proxy service must be run for each type of Internet application the firewall will support, such as an HTTP proxy for Web services.

Firewalls in the perimeterless age

The role of a firewall is to prevent malicious traffic reaching the resources that it is protecting. Some security experts feel this is an outdated approach to keeping information and the resources it resides on safe. They argue that while firewalls still have a role to play, modern networks have so many entry points and different types of users that stronger access control and security at the host is a better technological approach to network security.

Virtualization strategies such as virtual desktop infrastructure can dynamically respond to different scenarios by offering tailored access control to applications, files, Web content and email attachments based on the user’s role, location, device and connection. This approach to security does provide additional protection that a firewall can’t, but information security requires defense-in-depth, and firewalls still offer essential low-level protection as well as important logging and auditing functions.

 

What is a firewall?

What is a firewall?

A firewall is a software program or piece of hardware that helps screen out hackers, viruses, and worms that try to reach your computer over the Internet. If you can’t start Windows Firewall or you are getting an error, use Microsoft free tool to diagnose and fix problems.

What is a firewall?

What is a firewall?

  • If you use a computer at home, the most effective and important first step you can take to help protect your computer is to turn on a firewall.
  • Windows 8, Windows 7, Windows Vista, and Windows XP SP2 or higher have a firewall built-in and turned on by default. (Note: Support for Windows XP ended in April 2014.)
  • If you have more than one computer connected in the home, or if you have a small-office network, it is important to protect every computer. You should have a hardware firewall (such as a router) to protect your network, but you should also use a software firewall on each computer to help prevent the spread of a virus in your network if one of the computers becomes infected.
  • If your computer is part of a business, school, or other organizational network, you should follow the policy established by the network administrator.

Automatically diagnose and fix problems with Windows Firewall

Follow these steps to automatically repair Windows Firewall problems:
 
    • Select the Download button on this page.
    • In the File Download dialog box, click Run or Open, and then follow the steps in the Windows Firewall Troubleshooter.
Notes
  • This troubleshooter might be in English only. However, the automatic fix also works for versions of Windows in other languages.
  • If you’re not on the computer that has the problem, save the troubleshooter to a flash drive or a CD, and then run it on the computer that has the problem.
Download
What it fixes
    • Windows Firewall isn’t the default firewall
    • Windows Firewall doesn’t start
    • Windows couldn’t start Windows Firewall (Service-specific error 5 (0x5))
    • Remote Assistance isn’t working because it’s blocked by Windows Firewall
    • You’re unable to access shared files and printers because sharing is blocked by Windows Firewall
    • BFE service is missing
    • Firewall won’t start (Error Code 80070424)
Runs on
    • Windows 7
    • Windows 8
    • Windows 8.1
    • Windows 10

Firewall Company | Firewall Company India | Firewall Provider India | Firewall Company