The firewall system

Trong chương này sẽ giới thiệu về Firewall. Những nội dung cụ thể được trình bày gồm có: Khái niệm Firewall, chức năng của Firewall, khái niệm IDS/IPS, chức năng của IDS/IPS. Mời các bạn cùng tham khảo.

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Lecture Basic network management presents the following content: Hardware components, software and operating system, ethernet network overview, internet protocol address, LAN terminology and components, LAN architecture, Microsoft visio, service TCP/IP, LAN networking devices, building a local area network, monitoring network, firewall concepts, virus concepts, wan overview, building a wide area network, wireless concepts.

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In this chapter, students will be able to understand: Password policies ensure that users choose effective passwords; user-level security requires a separate account for each user; in share-level security, all users access shares by using the same passwords; a firewall is a hardware or software product that protects a network from unauthorized access, using techniques such as packet filtering, NAT, or proxy servers;...

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Used to connect two private networks together via the Internet Used to connect remote users to a private network via the Internet This could be done by opening your firewall to the LAN networking protocols (NETBIOS, NFS NetWare, AppleTalk)) But… it would also make those protocols available to any one on the Internet and they could come into your LAN at will Effectively make the whole Internet your LAN Exposes all of your data Anyone can easily take advantage of vulnerabilities in your internal hosts No privacy Better solution is to use a VPN in conjunction with your firewall ...

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Part of an overall Firewall strategy Sits between the local network and the external network Originally used primarily as a caching strategy to minimize outgoing URL requests and increase perceived browser performance Primary mission is now to insure anonymity of internal users Still used for caching of frequently requested files Also used for content filtering Acts as a go-between, submitting your requests to the external network Requests are translated from your IP address to the Proxy’s IP address E-mail addresses of internal users are removed from request headers Cause an actual brea...

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Also called a Proxy Firewall Acts as a relay for application level traffic Typical applications: Telnet FTP SMTP HTTP More secure than packet filters Bad packets won't get through the gateway Only has to deal with application level packets Simplifies rules needed in packet filter

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Với những người dùng hệ điều hành Windows cũ thì không có nhiều chương trình diệt virus và spyware miễn phí tương thích cho họ. ZoneAlarm không hỗ trợ trong Windows 98 hay ME. Vì thế nếu bạn đang dùng các hệ điều hành này bạn cần phải bỏ tiền mua một số Firewall như Norton Personal Firewall của Symantec hay PC-cillin Internet Security của Trend Micro

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Configuring the Web Proxy Client The web proxy client is any system that has been configured to use a proxy for Winsock applications. This is typically done in the client web browser settings

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The ICF, now dubbed Windows Firewall, is a simple stateful firewall that is part of the Windows XP operating system. In essence

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One of many third-party antivirus/Internet security suites, Trend Micro's PC-cillin includes a personal firewall that you can use to protect the system

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To paraphrase Shrek, the network perimeter is like an onion; it has lots of layers.

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NetFilter Checklist Building a NetFilterbased firewall is not difficult. End users interested in setting up their own NetFilter firewall can use the system to be used as the firewall. Install additional network interfaces (minimum number of required interfaces is two)

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As with any device on the network, firewalls run software (whether it is embedded in an application-specific integrated circuit [ASIC] or runs from Flash memory or runs from a disk file system) to be able to perform their functions.

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Because network traffic must cross the firewall to reach the end systems, the firewall has also become a point where the inspection of this traffic is appropriate.

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Many broadband routers and firewalls function primarily through the use of Network Address Translation (NAT) to hide the internal systems behind a single external IP address.

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Firewall Taxonomy Firewalls come in various sizes and flavors. The most typical idea of a firewall is a dedicated system or appliance that sits in the network and segments an "internal" network from the "external" Internet

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The previously mentioned policies focus primarily on defining the requirements and expectations of the firewall and interrelated systems.

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Intrusion Detection là thiết bị bảo mật vô cùng quan trọng. Intrusion Detection Systems (IDS) là giải pháp bảo mật được bổ sung cho Firewalls (hình dưới đây thể hiện điều đó). Một IDS có khả năng phát hiện ra các đoạn mã độc hại hoạt động trong hệ thống mạng và có khả năng vượt qua được Firewall. Hầu hết các vấn đề liên quan tới IDS đó là cấu hình sai, đó là việc thiết lập các thống số bị lỗi. Đó là những giao tiếp hợp lệ nhưng lại bị thiết bị IDS cảnh báo là các giao...

6p hoangnhan123 12-10-2009 723 281   Download