I was reading some forums about comodo firewall. Some users are not feeling easy in dealing with firewall. Here is a video tutorial to deal with this. 1. Go to http://www.personalfirewall.comodo.co... and download the firewall 2. ...

On virtually all systems (UNIX, Macintosh, Windows), programs call the function 'gethostbyaddr()' with the desired address. This function will then do the appropriate lookup, and return the name. This function is part of the sockets API. The key thing to remember about gethostbyaddr() is that it is virtual. It doesn't specify ...

The IP identification (ID) field is a two-byte field contained within the packet. Its sole purpose in life is allow IP packets to be fragmented: all fragments should contain the same ID as the original packet so that they can be pasted back together again. Most systems use the concept ...

A firewall is only a piece of the security puzzle, as it can only can protect your computer against certain types of attacks. A firewall should never be your computer's only protection. You always should combine a well-configured firewall with up-to-date anti-virus software and good system administration practices, such as: Turning off ...

The "correct" configuration of ICMP filters in a firewall is hotly debated. The problem is that ICMP are the "control messages" for TCP/IP. If you block some incoming ICMP, then you will break communication. The absolute minimum ICMP traffic to allow is the packets dealing with TCP path MTU discovery. Fragmenting ...

If an intruder can find a hole in your firewall, then the firewall has failed. There are no in-between states. Once a hacker is in, your internal network is at her mercy. If she hijacks an administrative account, you're in big trouble. If she hijacks an account with lesser privileges, ...

One of the problems with proxies is that they must evaluate a lot of information in a lot of packets. In addition, you need to install a separate proxy for each application you want to support. This affects performance and increases costs. A new class of firewall product is emerging ...

An application-level proxy server provides all the basic proxy features and also provides extensive packet analysis. When packets from the outside arrive at the gateway, they are examined and evaluated to determine if the security policy allows the packet to enter into the internal network. Not only does the server ...