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[{"id":483,"title":"Self-taught through trial and error","votes":545,"type":"x","order":1,"pct":78.42,"resources":[]},{"id":484,"title":"Formal training or courses","votes":30,"type":"x","order":2,"pct":4.32,"resources":[]},{"id":485,"title":"A job that required it","votes":34,"type":"x","order":3,"pct":4.89,"resources":[]},{"id":486,"title":"Other","votes":86,"type":"x","order":4,"pct":12.37,"resources":[]}] ["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"] ["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"] 350
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72

Exploring Port Knocking for Firewall Access Security Improvement

Fred Stluka from Bristle.com just introduced me to port knocking -- a method of opening ports on a firewall by trying to connect with a series of ports in a pre-determined order. The sequence of "knocks" acts like a secret access code -- like tapping out the first couple of bars from your favorite song to tell someone inside that it's you. . Similar secret taps were used during Prohibition to ensure that only those who knew the secret knock would be allowed into the speakeasies. These days, port knocking provides a way to forge access through a firewall by using the code. Port knocking is usually implemented via some kind of daemon that watches the firewall logs for signs of the knock sequence and then modifying the firewall's configuration to permit access through a specified port. You might use it on your home firewall to allow you to access your home network from the office or to provide a temporary back door to a network and then close it again after use. Generally, a sequence of three or more knocks is used to complicate the access. If a single knock were used, it would obviously be too easy. Guessing the right sequence of three or four port numbers, on the other hand, greatly reduces the likelihood that anyone would be able to guess their way into your network. Port knocking is customizable. You can select the port numbers and change the sequence as often as you feel is needed. As Wikipedia points out, you aren't limited to using this technique to open ports. You might use port knocking to initiate a shell script set up to do just about anything -- restart your web server, start your backups or run a scan of some sort. The link for this article located at IT World is no longer available. . Explore the concept of port knocking as a means to enhance firewall protection by employing hidden access techniques to secure your infrastructure.. PortKnocking, FirewallAccess, NetworkSecurity. . Anthony Pell

Calendar 2 Mar 03, 2010 User Avatar Anthony Pell Firewalls
74

Exploring Network Ports and Daemons in Communication Services

A nice quick summary of what ports and services are by the folks at O'Reilly. "Each service is handled by a program called a "daemon." The daemon listens on, or is bound to, a specific port to receive incoming requests from . . . . A nice quick summary of what ports and services are by the folks at O'Reilly. "Each service is handled by a program called a "daemon." The daemon listens on, or is bound to, a specific port to receive incoming requests from clients. When a request comes to the server, it is routed to the port requested and the daemon listening on that port sends back the reply." . Explore ports and services through O'Reilly's overview of network examination's daemons and processes.. Network Analysis, Service Ports, Daemon Services, Client Communication. . Anthony Pell

Calendar 2 Nov 19, 2001 User Avatar Anthony Pell Network Security
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/main-polls/150-what-got-you-started-with-linux?task=poll.vote&format=json
150
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[{"id":483,"title":"Self-taught through trial and error","votes":545,"type":"x","order":1,"pct":78.42,"resources":[]},{"id":484,"title":"Formal training or courses","votes":30,"type":"x","order":2,"pct":4.32,"resources":[]},{"id":485,"title":"A job that required it","votes":34,"type":"x","order":3,"pct":4.89,"resources":[]},{"id":486,"title":"Other","votes":86,"type":"x","order":4,"pct":12.37,"resources":[]}] ["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"] ["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"] 350
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