Avast Antivirus Introduction
Free Antivirus Download-Avast Antivirus Used by Millions
A free antivirus download. Avast antivirus program it is one of the most used and leading antivirus on the market today. Over 60 million people use avast compare to any other anti virus programs.
Avast is easy to download and run on any computer. With a few clicks the antivirus will load on a computer and be ready to start taking care of any virus and anti-spyware that is on a computer.
Once Avast is on a computer and running the first scan could take a couple of minutes. Avast will automatic scan the whole computer to assure the computer has no virus or anti-spyware within any program, files, or disk.
Avast Antivirus Real Time Protection Review
Written by the same firm that offers AVG Anti-Virus Software, Avast is like turning up the volume on your iPod to the full 80 watts per channel in a four-channel system so that you can literally blast any nasty stuff back to where it belongs.
If this were a motorcycle or racing track, you would find that Avast would probably be the pole sitter (starting car) and would lead the race through out as it passes trojans, links, bots, link kits and rootkits as if they weren't even there.
In their way, you have a system that performs much better and is much cleaner. In fact, the level of clean is amazing. One of the key features of the Avast software, another piece of thinking or "heuristic" software from AVG is its level of anticipation. Every time you are installing a software, it pokes around within the software package itself to see if the software may be bugged and if it is, it offers you two options, one let it go through - if you already used the software and know what it is there's no reason why not - but if it is new software, you can safely let it kill the intruder and you can find another piece of software to use.
Ip Spoofing And Ips Protection With A Cisco Asa 5500 FirewallThe Cisco ASA firewall appliance provides great security protection out-of-the box with its default configuration. However, to increase the security protection even further, there are several configuration enhancements that can be used to implement additional security features. Two of these features are IP Spoofing protection and basic Intrusion Prevention (IPS) support.
IP Spoofing Protection
IP spoofing attacks are those that change the actual source IP address of packets to obscure their true origin. This means that packets arriving at a particular interface (e.g inside) must have a valid source IP address that matches the correct source interface according to the firewall routing table. Normally the firewall only looks at the destination address of a packet in order to forward it accordingly. If you enable the IP Spoofing mechanism, the firewall checks also the source address of the packets.
If for example our inside interface connects to internal network 192.168.1.0/24, this means that packets arriving at the inside firewall interface must have a source address in the range 192.168.1.0/24 otherwise they will be dropped (if IP Spoofing is configured).
The IP Spoofing feature uses the Unicast Reverse Path Forwarding (Unicast RPF) mechanism, which dictates that for any traffic that you want to allow through the security appliance, the security appliance routing table must include a route back to the source address.
To enable IP Spoofing protection, enter the following command:
CiscoASA5500(config)# ip verify reverse-path interface "interface_name"
For example, to enable IP spoofing on the inside interface, use the following command:
CiscoASA5500(config)# ip verify reverse-path interface inside
Basic IPS Protection
Although the ASA Firewall supports full IPS functionality with an extra IPS hardware module (AIP-SSM), it supports also basic IPS protection which is built-in by default without using an extra hardware module. The built-in IPS feature supports a basic list of signatures and you can configure the security appliance to perform one or more actions on traffic that matches a signature. The command that implements the basic IPS feature is called "ip audit".
There are two signature groups embedded in the firewall software: "Informational" and "Attack" signatures. You can define an IP audit policy for each signature group as following:
For informational signatures:
CiscoASA5500 (config)# ip audit name "name" info [action [alarm] [drop] [reset]]
For attack signatures:
CiscoASA5500 (config)# ip audit name "name" attack [action [alarm] [drop] [reset]]
The keywords [alarm], [drop], [reset] define the actions to perform on a malicious packet that matches one of the signatures. [alarm] generates a system message showing that a packet matched a signature, [drop] drops the packet, and [reset] drops the packet and closes the connection.
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