Wonderfull world of Firewalls

May 28, 2008 · Filed Under Internet 

FirewallFirewalls make it possible to filter incoming and outgoing traffic that flows through your system. A firewall can use one or more sets of “rules” to inspect the network packets as they come in or go out of your network connections and either allows the traffic through or blocks it. The rules of a firewall can inspect one or more characteristics of the packets, including but not limited to the protocol type, the source or destination host address, and the source or destination port.

Firewalls can filter traffic and block anything you don’t want on your network. you can block Spam Sites, Facebook, dodgy sites, it can even pick up on the pictures on websites and block those for you aswell. You can also set up a firewall to only allow traffic to certain sites. So you could block EVERYTHING and only allow the computers on your network to access your company website.

I use a firewall called Clarckconnect. With that I can monitor the bandwidth usage on my network, I can see who visited what websites, and How much data was used on that website. I also use my Firewall as an FTP server to store data on, sothat I can get to that data from anywhere. I can set up remote access to my firewall and do work on my computer at home while I’m sitting in mug and bean.
Is it still safe then? yes. Firewalls use https protocols witch means its a secure protocol where you have to log into. Even more, The firewall uses a specific port (set by user). so Without knowing what your DNS name is or the public I P address for your firewall and not knowing what port to use. No one is able to get into your firewall or network.

Some points to what A firewall can do.

  • Packet filter: Looks at each packet entering or leaving the network and accepts or rejects it based on user-defined rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing.
  • Application gateway: Applies security mechanisms to specific applications, such as FTP and Telnet servers. This is very effective, but can impose a performance degradation.
  • Circuit-level gateway: Applies security mechanisms when a TCP or UDP connection is established. Once the connection has been made, packets can flow between the hosts without further checking.
  • Proxy server: Intercepts all messages entering and leaving the network. The proxy server effectively hides the true network addresses.

    • In practice, many firewalls use two or more of these techniques in parallel

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