mod_proxy in .NET

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Generally Apache uses the mod_proxy module to act as an intermediary between the client and the Web server that actually contains content As a proxy, Apache will decide if it should save time and bandwidth and use a cached file to fulfill a request or if it should grab the real file from the server and pass it back to the client As of Apache 13, mod_proxy is still only an HTTP/10 proxy
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Firewalls get their name from the part of a car chassis that separates the passenger compartment from the engine compartment If there is an engine fire, the firewall helps to protect the passengers A network firewall separates parts of a network, such as a business network, from the Internet Instead of protecting from fire, it protects from intruders and allows control of the information that travels between networks Having a firewall is
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generally a good idea because it allows an administrator to centralize many security policies to one system rather than having to worry about every single machine on a network Presence of a firewall does not guarantee absolute security but can enhance it significantly if the firewall is well maintained To make the firewall effective, all traffic entering or leaving a site must pass through it In some cases, multiple firewalls are necessary when a company has multiple connections, as routing all traffic through a single firewall may not be feasible In the end, all access points into and out of the internal network will need a firewall to guard them In addition to security, the firewall also provides network address translation (NAT) Because Internet network addresses are becoming very scarce, a firewall running NAT enables a company to use a few legal IP addresses for essential Internet systems (DNS, mail, Web, FTP, etc) while the private network uses the IP address space reserved for private use by IANA With NAT, as data packets pass through the firewall from systems using the private IP addresses, the firewall translates them into registered IP addresses Conversely, when the reply packets return from a system on the Internet, the firewall performs a reverse translation
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Types of Firewalls
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Although firewalls can perform many different functions, we will discuss three particular types: Packet filtering Proxy serving IP masquerading
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By combining these three functions, we can create an effective firewall that will help maintain a tight, secure network
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By running a firewall as a packet filtering router, the firewall examines each packet of data (a datagram) against a set of predefined rules The filtering rules are based on packet header information, which is available to the IP forwarding process of the kernel In the IP packet header, you will find the following information:
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IP source address IP destination address Protocol: UDP, TCP, ICMP, or IP tunnel Source port for UDP or TCP Destination port for UDP or TCP ICMP message type Incoming interface of the packet Outgoing interface of the packet
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Based on the information that the IP packet headers provide, rules can be defined that either allow or deny packets to reach their destination For example, incoming SMTP traffic can be permitted to go only to a designated mail exchanger host on the internal network and deny all incoming telnet At the same time, incoming HTTP and FTP requests to a specific Web or FTP server can be allowed
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Why Packet Filtering
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Packet filtering is useful not only for allowing, denying, and routing incoming requests, but also because it provides a first line of defense against some types of attacks, most notably spoofing, fragment, and source routing attacks Spoofing In an IP spoofing attack, the malicious person sends packets from outside that are designed to resemble packets that would have originated from an internal host In other words, the packets are disguised to look as though they originally came from the internal network behind the firewall To combat spoofing, the firewall simply checks the packets that arrive on the external network interface, and if their source address is that of an internal host, it refuses to admit the packets Hence, this sort of attack is simple to identify and nullify To turn on the kernel s built-in anti-spoofing capabilities, run this command:
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