Firewall Basing
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It is common to base a firewall on a stand - alone machine running a common Os, Firewall functionality can also be implemented as a software module in a router or LAN switch.
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Solution
Configuration Management
The main weapon in network attack defence is tight configuration management. The following
measures should be strictly implemented as part of configuration management.
• If the machines in your network should be running up-to-date copies of the operating system
and they are immediately updated whenever a new service pack or patch is released.
• All your configuration files in your Operating Systems or Applications should have enough
security.
• All the default passwords in your Operating Systems or Applications should be changed after
the installation.
• You should implement tight security for root/Administrator passwords
Firewalls
Another weapon for defense against network attack is Firewall. Firewall is a device and/or a
sotware that stands between a local network and the Internet, and filters traffic that might be
harmful. Firewalls can be classified in to four based on whether they filter at the IP packet level,
at the TCP session level, at the application level or hybrid.
1. Packet Filtering: Packet filtering firewalls are functioning at the IP packet level. Packet
filtering firewalls filters packets based on addresses and port number. Packet filtering firewalls
can be used as a weapon in network attack defense against Denial of Service (DoS) attacks and
IP Spoofing attacks.
2. Circuit Gateways: Circuit gateways firewalls operate at the transport layer, which means that
they can reassemble, examine or block all the packets in a TCP or UDP connection. Circuit
gateway firewalls can also Virtual Private Network (VPN) over the Internet by doing encryption
from firewall to firewall.
3. Application Proxies: Application proxy-based firewalls function at the application level. At
this level, you can block or control traffic generated by applications. Application Proxies can
provide very comprehensive protection against a wide range of threats.
4. Hybrid: A hybrid firewall may consist of a pocket filtering combined with an application
proxy firewall, or a circuit gateway combined with an application proxy firewall.
Encryption
Encryption is another great weapon used in defense against network attacks. Click the following
link to get a basic idea of encryption.
Encryption can provide protection against eavesdropping and sniffer attacks. Private Key
Infrastructure (PKI) Technologies, Internet Protocol Security (IPSec), and Virtual Private
Networks (VPN) when implemented properly, can secure you network against network attacks.
Other tips for defense against network attack are
• Privilege escalation at different levels and strict password policies
• Tight physical security for all your machines, especially servers.
• Tight physical security and isolation for your back up data..
firewall and its types
A firewall can be either software-based or hardware-based, and is used to help secure a network by preventing unauthorized access. There are several types of firewalls including network layer, application layer, circuit layer, stateful multi-layer inspection, proxy, host-based, and hybrid firewalls. Firewalls work at different levels, from just packet filtering at the network level, to deep packet inspection and application-level filtering at higher levels.
Firewall ppt
This document provides an overview of firewalls, including what they are, their history, types, and basic concepts. A firewall is a program or hardware device that filters network traffic between the internet and an internal network or computer. There are different types, including packet filtering routers, application-level gateways, and circuit-level gateways. Firewalls aim to only allow authorized traffic according to a security policy while protecting systems from outside penetration. They provide advantages like concentrating security but also disadvantages like potentially blocking some network access.
Firewall protection
A firewall is hardware or software that filters network traffic by allowing or denying transmission based on a set of rules to protect networks from unauthorized access. There are two main types - network layer firewalls which filter at the IP address and port level, and application layer firewalls which can filter traffic from specific applications like FTP or HTTP. A DMZ (demilitarized zone) is a physical or logical sub-network exposed to an untrusted network like the internet that contains external-facing services, protected from internal networks by firewalls. Firewalls provide security benefits like restricting access to authorized users and preventing intrusions from untrusted networks.
Firewall
Hai...!! Here the powerpoint gives you a clear idea about Firewall and its types..
Make use of it..
Firewall
This document provides an overview of firewalls, including what they are, how they work, types of firewalls, and their history. A firewall is a program or device that filters network traffic between the internet and an internal network based on a set of rules. There are different types, including packet filtering routers, application-level gateways, and circuit-level gateways. Firewalls aim to only allow authorized traffic according to a security policy while protecting internal systems. They provide advantages such as restricting access and hiding internal network information but can also limit some network connectivity.
Lessson 2 - Application Layer
This document discusses firewalls and VPNs. It covers firewall types like application layer firewalls and hybrid firewalls. Firewall processing modes include packet filtering, proxy services, and circuit gateways. Common firewall architectures are packet filtering routers, dual homed firewalls, screened host firewalls, and screened subnet firewalls with a DMZ. The document also discusses selecting, configuring, and managing firewalls as well as content filters and protecting remote connections with VPNs.
Firewall presentation
This presentation discusses different types of firewalls and their functions. It begins by defining a firewall as a device or software that controls incoming and outgoing network traffic based on security rules. It then discusses hardware and software firewalls, with hardware firewalls protecting entire networks at the router level while software firewalls protect individual computers. The presentation also covers four main types of firewall techniques: packet filtering, application proxy, stateful inspection, and circuit-level gateways. It concludes by stating that while firewalls provide important security, no single tool can handle all security functions on its own.
INTRODUCTION TO FIREWELL
Pankaj Kumar, a 3rd year B. Tech student at Shanti Institute of Technology Meerut, discusses firewalls in his document. He defines a firewall as a device that provides secure connectivity between networks. Firewalls can be hardware-based, software-based, or a combination of both, and are used to prevent unauthorized access to private networks. Packet filtering, application gateways, and circuit-level gateways are common firewall techniques. A personal firewall can block hackers and protect personal information, but has limitations like not preventing email viruses. Major firewall manufacturing companies include Nortel Networks, McAfee, and 3Com Corporation.
FIREWALL PROJECT.pptx BY SAKSHI SOLAPURE
The document discusses firewalls, including their definition as devices that monitor incoming and outgoing network traffic based on security rules. It covers firewall protection in small and large networks, overall firewall system design, important design facts, categories of firewalls like packet filtering and proxy, types of firewall software, and benefits and disadvantages of firewalls. The conclusion restates that firewalls introduce network security by filtering traffic according to rules to protect against external and internal threats.
Firewalls
This document discusses different types of firewalls, including hardware and software firewalls, and how they work using packet filtering, proxy services, and stateful inspection. It describes the history of firewalls and why they are needed for both personal and business use to protect networks from threats like viruses, malware, and unauthorized access. Next generation firewalls are also introduced which can provide more application visibility, control, and threat prevention compared to traditional firewalls.
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- 2. Milestone Firewall Basing Bastion Host Host – based firewall Personal firewall PREPARED BY : PINA CHHATRALA 2
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- 4. Bastion Host A bastion host is a system identified by the firewall administrator as a critical strong point in the network’s security. It serves as a platform for an application – level or circuit – level gateway. Some common characteristics : Executes a secure version of its OS, making it a hardened system. Only the services that the network administrator considers essential are installed on the bastion host. PREPARED BY : PINA CHHATRALA 4
- 5. Bastion Host Some common characteristics : It may require some additional authentication before user is allowed access to the proxy services. Each proxy is configured to support only a subset of the standard application’s command set. Each proxy is configured to allow access only to specific host systems. Each proxy maintains detailed audit information by logging all traffic. PREPARED BY : PINA CHHATRALA 5
- 6. Bastion Host Some common characteristics : Each proxy module is a very small software package specifically designed for network security. Each proxy is independent of other proxies on the bastion host. A proxy generally performs no disk access other than to read its initial configuration file. Each proxy runs as a nonprivilaged user in a private and secured dictionary on the bastion host. PREPARED BY : PINA CHHATRALA 6
- 7. Host – based Firewalls A host – based firewall is a software module used to secure an individual host. Such modules are available in many OSs or can be provided as an add-on packages. It filters and restricts the flow of packages. A common location for such firewalls is a server. Advantage : Filtering rules can be tailored to the host environment. Protection is provided independent of technology. PREPARED BY : PINA CHHATRALA 7
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Editor's Notes
- TCP connections : one between itself and a TCP user on an inner host and one between itself and TCP user on an outside host.
- TCP connections : one between itself and a TCP user on an inner host and one between itself and TCP user on an outside host.
- TCP connections : one between itself and a TCP user on an inner host and one between itself and TCP user on an outside host.
- TCP connections : one between itself and a TCP user on an inner host and one between itself and TCP user on an outside host.
- TCP connections : one between itself and a TCP user on an inner host and one between itself and TCP user on an outside host.
- TCP connections : one between itself and a TCP user on an inner host and one between itself and TCP user on an outside host.