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SmoothWall is a family of Internet security products, designed to defend your users and your network from external attacks. SmoothWall Express is based on the Linux operating system. Linux is the ideal choice for security systems; it is well proven, secure, highly configurable and freely available as open source code. SmoothWall includes a hardened subset of the GNU/Linux operating system, so there is no separate OS to install. Designed for ease of use, SmoothWall is configured via a web-based GUI, and requires absolutely no knowledge of Linux to install or use.

 * Stateful packet inspection using Linux 2.4 kernel with iptables
    and netfilter.
 
  * Improved installer:

    - Network card skip.
    - Displays MAC address of detected cards.
    - Prefilled IP addresses.
    - Configure upstream web proxy for fetching update list.
      when a direct connection cannot be made or is not allowed.
 
   * Improved web user interface; more user friendly, better error
    reporting

   * Improved connectivity device support: 

   * Universal Plug-n-Play support for Microsoft Windows XP users.

   * Improved network usage graphs with RRDtool.
 
   * Improved proxy performance through diskd and other squid tweaks.
 
   * Static assignments in DHCP server options based on MAC address.
 
   * SmoothWall time sync with internal or external NTP server.  Can
    sync from a built-in list of servers. (Does not provide ntpd
    service to Green or Orange network however)
 
   * Configuration backup to floppy disk for quick install on another
    machine, or re-install on same machine 
  
   * Simpler port forwarding; no need to open ports with external
    access page, the port (or ports - port ranges are allowed now)
    is opened and forwarded on one page.
   
   * IP Blocking feature; block any given external IP address or
    subnet from accessing your SmoothWall or any port forwarded
    hosts.  Additionally, blocking rules can be added from the
    firewall log interface.
   
   * Advanced networking features; block ICMP ping, block multicast
    traffic and enable SYN cookies.
   
   * Improved VPN; no need for "next hop" setting, optionally enable
    compression on the tunnel, still possible to connect to a
    SmoothWall GPL 1.0 VPN.
 
   * Perform network diagnostic (ping, traceroute) from web interface.
 
   * New Java SSH client (replaced due to licence conflict).

   * Added clear cache option to web proxy.