Need more information on DMZ effect.

By Nekurahn ยท 8 replies
Mar 1, 2008
  1. Good evening everyone.

    I am playing Final Fantasy XI on my laptop and I am getting an FFXI-4001 error, which has been identified as a problem pertaining to my router. Because of my router model, I am being told that to fix this problem, the only way is to turn off the DMZ on my router. I would like to know what DMZ does and what consequences this will have for my laptop and pc using internet through it.

    Thank you for your time, have nice day.
  2. Ph30nIX

    Ph30nIX TS Rookie Posts: 243

    DMZ is a setting on a router that is used to expose a single computer directly to the internet, rather than hiding it using NAT etc.

    Check for the DMZ setting on your router, and change it to the opposite of whatever it is.
  3. jobeard

    jobeard TS Ambassador Posts: 11,138   +985

    DMZ Description

    A DMZ is a special network topology (layout/wiring) like:
    Internet --- firewall 
                   ^   |
                   ^   +------ Public Server        (hidden ports)
                   ^   (ports 22, 25, 80 )  ---- proxy ----- firewall-router ----- Company Lan Systems
                   ^       Public Progams                   ^
                   ^                                        ^
                       The DMZ area
    Access into the Compan Lan is hidden in two ways;
    1- non-public ip addresses
    2- non-standard ports​
    The Proxy is the only place the mapping of external to internal services is known
    and as a result, EVEN if the firewall is breached, it is impossible to make entry into
    the Lan systems. A worst case intrusion is handled by complete tear down of the
    systems within the DMZ and reinstalling everything, including the OS.

    The net effect is to minimize losses and work to get running (safely) again.
  4. Nekurahn

    Nekurahn TS Rookie Topic Starter

    So there is no consequence for a home-user? The way I understand it, it would only have consequence in a business environment with a large network. Am I correct?
  5. jobeard

    jobeard TS Ambassador Posts: 11,138   +985

    You can use that setup too; but what would be in the DMZ and are you prepared to
    Proxy services from the DMZ across the second firewall?

    As stated in another post, the DMZ setting on the router (the one closest to the ISP)
    allows direct access to the system attached. At home you would need:
    ISP ---- router(dmz setting)---switch--Game System
                                   +---2nd router--- other lan systems
    to avoid the Proxy issue
  6. Nekurahn

    Nekurahn TS Rookie Topic Starter

    This is what I have:

    ISP ----- router(dmz setting) ----- PC (wired)
    ...........................+----- Laptop (wireless)
    ...........................+----- Xbox 360 (wired)

    What effect will turning off the DMZ of my router have on me?
  7. jobeard

    jobeard TS Ambassador Posts: 11,138   +985

    As is, the Laptop and Xbox are also exposed for trojans and direct attacks.

    The firewalls on all systems are your sole protection.
  8. Nekurahn

    Nekurahn TS Rookie Topic Starter

    So turning off DMZ would do nothing in my case?
  9. jobeard

    jobeard TS Ambassador Posts: 11,138   +985

    you would likely need to port forward to the game machine the ports used by your games.

    It would actually INCREASE your securtity to have it off
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