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Proxy Server
- Details
- Category: Security
- Published on Saturday, 07 May 2011 04:04
- Written by Server Administrator
- Hits: 3003
Proxy Server
A proxy server is a server that acts on behalf of the host and request data. If the host is requesting data from www.google.com, the proxy server will receive the request and the proxy server will forward the information back to the host according to the filtering rules.
Uses of Proxy Servers
The proxy server is used to filter data on a network. Most corporations will use proxy servers to filter inappropriate information from the internet. On the other side of the coin, hackers will use proxy server to hide information about their location and their computers. A proxy server offsite and setup correctly can completely mask the host computer.
Proxy Server Types
Security with a Firewall
- Details
- Category: Security
- Published on Saturday, 07 May 2011 04:09
- Written by Server Administrator
- Hits: 492
Security with a Firewall
A secure Internet connection is becoming hard to obtain. Depending on how a network is set up correlates to what security protocol needs to be put in place. One good step in obtaining a secure Internet connection with any network would be to setup a firewall. According to Jeff Tyson (2008), “A Firewall is simply a program or hardware device that filters the information coming through the Internet connection into your private network or computer system.” The previous quote implies that a firewall, at its simplest form, is just a filter. Firewalls can be software, hardware and a combination of both.
One type of firewall is a software firewall. Software firewall is typically software installed on the local computer. Most operating systems (OSs)–Windows, Mac, and Linux/UNIX—have a software firewall installed by default. According to National Cyber Alert System (2008), “If you don't have a built-in firewall, you can obtain a software firewall for relatively little or no cost from your local computer store, software vendors, or ISP.” Software firewalls are very easy to obtain and install on a computer system. Some software firewalls are Windows Firewall, Norton Internet Security, and Iptables from Linux. Software firewalls are good when a single computer is connected to the Internet.
NMAP and ZENMAP
- Details
- Category: Security
- Published on Tuesday, 13 December 2011 12:55
- Written by Server Administrator
- Hits: 367
NMAP and ZENMAP
NMAP is a security tool I use to see network traffic on remote servers. NMAP can do many type of scans and this post is only touching the beginning of the command. When I am looking for a port on a remote server I use the command nmap 192.168.1.100. This will show me all open ports. If I want to scan an entire subnet I run the command NMAP 192.168.1.0/24. ZENMAP is the GUI frontend to NAMP and I have never used the GUI. I am not one to use GUIs. They just sound messy. :)
Here is a good book on nmap at http://nmap.org/book/
Simple command
nmap 192.168.1.100
nmap 192.168.1.0/24
If there are any questions, see our forum at http://forum.the-server-admin.com
DOS Denial-of-services Attack
- Details
- Category: Security
- Published on Monday, 05 December 2011 12:46
- Written by Server Administrator
- Hits: 225
DOS Denial-of-services Attack
Many web servers are being attacked with an attacked called a DOS or Denial-of-services. A DOS attack works by servers or computers on the internet requesting the site many times and this stops all incoming requests. This type of attack is common on the internet and there is really only one way t stop a DOS. To stop a DOS one must block the incoming request that is not wanted.
Below are a few tools to block incoming request:
* Use a CISCO PIX
* Use iptables in Linux (iptables -A INPUT -s IP-ADDRESS -j DROP)
* Smoothwall – This is iptables
Really one needs to use a firewall of some type to block the IP addresses that are not wanted.
If there are any questions, stop by and see our forum at http://forum.the-server-admin.com.