Re: SMTP server behind an ADSL Switch?

david20_at_alpha2.mdx.ac.uk
Date: 10/22/03

  • Next message: Larry Kilgallen: "Re: DECUS: "C" stands for Computer, not Corp." 
    Date: Wed, 22 Oct 2003 11:00:00 +0000 (UTC)

    In article <bn4nh7$tk62p$1@ID-209632.news.uni-berlin.de>, "Martin P.J. Zinser" <zinser@zinser.no-ip.info> writes:
    >david20@alpha2.mdx.ac.uk wrote:
    >> In article <3F956B29.84D24775@istop.com>, JF Mezei <jfmezei.spamnot@istop.com> writes:
    >>
    >>>Didier Morandi wrote:
    >>>
    >>>>What is DMZ?
    >>>
    >>>In a NAT router, you specify to which host in your intranet a call to port X
    >>>gets directed. The "DMZ" (is that just a consumer buzzword, or is that used
    >>>for serious routers as well ?) is essentially the specification of a default
    >>>host to which all other calls get directed.
    >>>
    >>
    >> Home NAT router providers may be misusing the term DMZ in that manner but
    >> for serious commercial firewall/router manufacturers it definitely does not
    >> have that meaning.
    >> The DMZ is a DeMilitarized Zone - ie an area connected to the firewall which
    >> can contain multiple systems. It is definitely not a NAT default host.
    >>
    >>
    >> David Webb
    >> VMS and Unix team leader
    >> CCSS
    >> Middlesex University
    >
    >Well, we are talking about a home setup here taking it from Didiers
    >original question, and yes I think most people here are aware of the
    >differences of a commercial grade and a home DSL router for 50 bucks
    >solution. Still in both cases the system in the DMZ are in front of the
    >"firewall" before your "core" network.
    >
    I was responding to the

    "
     The "DMZ" (is that just a consumer buzzword, or is that used
     for serious routers as well ?) is essentially the specification of a default
     host to which all other calls get directed.

    "

    Which specifically asked whether the term DMZ as a "specification of
    a default host" was used that way in "serious routers".

    If they are really in front of the firewall then they are NOT in a DMZ - they
    are directly connected to the internet. By definition a DMZ is behind at least
    one firewall interface it is protected to some extent.
    I haven't looked at home DSL routers with NAT but I would suspect that most
    which talk of NAT default hosts and DMZ are really saying that such a default
    host should be placed in a DMZ. Since by accepting incoming NAT connections
    which have not been explicitly mapped it is obviously less protected then the
    other systems and therefore should not be directly connected to such systems.

    If the router provides access control lists or other firewall functions then
    it may well provide a third interface to which such a default NAT host could
    be connected ie a DMZ.

    If on the other hand they really do refer to a NAT default host as a DMZ then
    they are misusing that term.

    David Webb
    VMS and Unix team leader
    CCSS
    Middlesex University
      

    >As for dynamic DNS providers check www.no-ip.com and www.dyndns.org, I
    >personally am a happy camper with no-ip but know of many other people
    >who are satisfied with dyndns, I really do not want to start a "My xxx
    >is better than your yyy" discussion over this.
    >
    >Greetings, Martin
    >

  • Next message: Larry Kilgallen: "Re: DECUS: "C" stands for Computer, not Corp."

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