Firewall evolution - deep packet inspection

Wednesday, 30 July 2003, 7:34 PM EST

Firewalls provide a variety of services to networks in terms of security. They provide for network address translation (NAT), virtual private networks (VPN), and filtering of traffic that does not conform to the network's stated security policy. There are many forms of firewalls from simple packet filters to circuit-level gateways to proxy firewalls. Firewalls are being asked to fill a larger and more varied role in network security these days than several years ago. One of the more recent innovations in firewall technology is the application of deep packet inspection or DPI. Deep Packet Inspection can be seen as the integration of Intrusion Detection (IDS) and Intrusion Prevention (IPS) capabilities with traditional stateful firewall technology. Traditional networks have a defined boundary demarcated by a firewall with an IDS sensor sitting behind it.

One of the primary benefits of the traditional firewall/IDS deployment is that the failure of one component does not leave the network completely unprotected. Also, IDS appliances can be deployed throughout the LAN and monitor traffic inside the LAN as opposed to boundary areas between networks. This design is illustrated in Figure 1 below. The IDS monitors traffic that passes through the firewall (as defined in the firewall policy) and inspects packets for malicious activity.

[ Read more ]




Spotlight

The synergy of hackers and tools at the Black Hat Arsenal

Posted on 27 August 2014.  |  Tucked away from the glamour of the vendor booths and the large presentation rooms filled with rockstar sessions, was the Arsenal - a place where developers were able to present their security tools and grow their community.


Weekly newsletter

Reading our newsletter every Monday will keep you up-to-date with security news.
  



Daily digest

Receive a daily digest of the latest security news.
  

DON'T
MISS

Mon, Sep 1st
    COPYRIGHT 1998-2014 BY HELP NET SECURITY.   // READ OUR PRIVACY POLICY // ABOUT US // ADVERTISE //