Fire Wall Design
Wed, 20 Jan 2010 23:08:02 +0000
January 18th, 2010 by Relaxtubes
Cisco Networkers 2009 – Firewall Design and Deployment | 590 MB
This session addresses Cisco firewalls and how they are used to enforce security policy around the network. It includes best practices as part of a case study that illustrates these various techniques in practice and options on how they can be implemented. Common design scenarios are covered for both the ASA firewall appliance and the Cisco Firewall Services Module, including virtualization and transparent (Layer 2) mode. Pros and cons of each design are discussed in depth. Participants should have a working knowledge of TCP/IP and understand general networking and packet flow. This session focuses on the Cisco ASA Adaptive Security Appliance and Firewall Services Module and does not cover any Cisco IOS based firewall solutions.
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http://hotfile.com/dl/24774800/3615e86/b1u3eyes.Firewall.Design.n.Deployment.part1.rar.html
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Provide security against risks associated with e-mail has become a burden for most IT professionals in 2006. According to a recent study by Postini, spam and email viruses now lead to 80% of all e-mail, compared with 50% in 2000. As a result, IT professionals now in a most difficult in providing network security for the amount of spam. IT professionals also have the disadvantage of defending against new forms of email threats such as spam zombies, directory harvest attacks,Trojan mass mailings, as well as the latest virus e-mail.
In this article, I have the seven most effective spam fighting tips for organizations referred to e-mail servers home. These seven tips are proven techniques that I use for my clients, partners and employees that their scope (network desire to forge) security used.
1. Firewall:
A firewall is the first line of defense against hackers, crackers and spammers. Without a firewall, the network is a disastercoming our way, and could at any novice hackers free reign on the network. If your organization has multiple users of the Internet is the tool to protect your network is essential.
2. Block port 25:
The firewall to allow outbound traffic on TCP port 25 for all mail servers. Block outgoing traffic on TCP port 25 for all other computers and servers. Used on the Internet, TCP port 25 for email traffic through SMTP (Simple Mail Transport Protocol). Blocking this port is a goodSafety practices and prevent mass mailing worms and zombies for spam e-mails from users 'computers'.
3. Managed Email Filtering:
Use a managed filtering solution such as Postini, Brightmail, or SpamSoap. Managed Email Filtering services quarantine spam, viruses and email threats before e-mail server in your network. In comparison to desktop filters and server appliances, managed filtering services provide a higher perimeter (network)Protection by preventing delivery of spam and viruses on the network and servers.
4. Check Relay Setting:
Controlled by an e-mail server relay setting that computers and servers are able to send SMTP e-mail on behalf of your organization. Check the settings and to limit the range of IP addresses to users via e-mail on your local network. Mitigate some mail server authentication settings e-mail relay. If the authentication-based relay is available to set up and configure. NoteIf there is to send the device is not set properly, spammers will be able to e-mail from the mail server. This attack is often regarded as a relay race "open" or "spam relay". Verify useful in open-relay test to [http://www.abuse.net/relay.htm] to determine whether to send spam from your server know.
5. Blacklist:
Configure the mail server (s) with a blacklist. A black list (black hole list) is a database or a list of known spam sources. Most modern email servers can be configured toE-mail entry against online blacklists. The messages from these sources can be blocked. Recommend blacklist your e-mail server configured with Spamhaus. Spamhaus.org is a great free service. Some black lists of other good have DBSL and SpamCop.
6. Reverse DNS:
Reverse DNS (rDNS) associates an IP address of a domain name. Most of the mail server, as an anti-spam feature often use a reverse DNS lookup of an e-mail domain name with its IP ComparisonAddress. If the IP address from search rDNS does not match the domain name, it is probably spam. If you have not already done so, install and configure reverse DNS entries on your DNS server.
7 Anti-Virus Scan:
There are many tools that provide adequate anti-virus protection for desktops at work. Most anti-virus software to detect virus threats that e-mail spam, such as mass mailing worms, Trojans good, and the directoryHarvesters. The big companies want the companies to use anti-spam software with management and monitoring tools that allow tracking of network virus outbreaks.
Recommended links:
– Http: / / www.spam-x.com [Postini service - managed filtering, 1 to 500 users]
– Http: / / [www.postini.com Postini service - managed filtering, 500 + Users]
– Http: / / www.spamhaus.org [Blacklist]
– Http: / / www.dbsl.org [Blacklist]
–http://www.spamcop.net [Blacklist]
– [Http: / / www.abuse.net / relay.htm] [Open relay test]
– Http: / / [www.dnsreport.com DNS Report / open relay test]
– Http: / / www.dnsstuff.com [Spam database lookup and open relay test]
– [Http: / / www.cnn.com/2004/TECH/ptech/02/17/spam.zombies.ap] [Spam Zombie Article]
E-mail viruses and threats delivered by spam have cost businesses lost billions of dollars in costs and productivity. Each spam e-mail orfrom your domain will cost your organization money and bandwidth. By implementing these seven tips, your organization can reduce spam and reimbursement.
This article is: © Copyright 2006 Todd Green and free for republication.
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Tags: e-mail, Network, organization's, protectPosted January 20, 2010 by gtr under Virus Scan Articles
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