RE: address with brackets

  • From: "Mulnick, Al" <Al.Mulnick@xxxxxxxxxx>
  • To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 15 Sep 2003 12:06:22 -0400

I'm starting to wonder if I'm reading the same RFC :)

I see this part of the RFC :

6.2.3.  DOMAIN TERMS

        A domain-ref must be THE official name of a registry, network,
        or  host.   It  is  a  symbolic  reference, within a name sub-
        domain.  At times, it is necessary to bypass standard  mechan-
        isms  for  resolving  such  references,  using  more primitive
        information, such as a network host address  rather  than  its
        associated host name.

        To permit such references, this standard provides the  domain-
        literal  construct.   Its contents must conform with the needs
        of the sub-domain in which it is interpreted.

        Domain-literals which refer to domains within the ARPA  Inter-
        net  specify  32-bit  Internet addresses, in four 8-bit fields
        noted in decimal, as described in Request for  Comments  #820,
        "Assigned Numbers."  For example:

                                 [10.0.3.19]

        Note:  THE USE OF DOMAIN-LITERALS IS STRONGLY DISCOURAGED.  It
               is  permitted  only  as  a means of bypassing temporary
               system limitations, such as name tables which  are  not
               complete.

        The names of "top-level" domains, and  the  names  of  domains
        under  in  the  ARPA Internet, are registered with the Network
        Information Center, SRI International, Menlo Park, California.



And especially notice the NOTE section which strongly discourages the use of
domain literals.  I have to question the use of that by any
blacklist/blocklist/blockhead that says you have to have one of those,
especially since that concept doesn't really scale well, does it?  Multiple
MX records are needed and if DNS is inoperable, then I suppose that reverse
DNS checks would also be broken, right?  

I'm not trying to rant about this, but it makes no sense!!  What is the
value of a domain-literal/implicitly defined FQDN for host delivery?  Better
yet, is that not a bigger problem to specify such a thing with little
return?  I'd have to give away half the addresses (which arguably should be
public, but the situation is if DNS is down).  I think that the further use
of the RFC which says that you should be able to fall back to trying an A RR
for a domain is a far better use of the system than is domain-literal
acceptance.


Al

-----Original Message-----
From: Mark Fugatt [mailto:mark@xxxxxxxxx] 
Sent: Monday, September 15, 2003 10:27 AM
To: [ExchangeList]
Subject: [exchangelist] RE: address with brackets


http://www.MSExchange.org/

Here is a link that should help you out: http://tinyurl.com/g8vq 


Mark Fugatt 
MCT, MCSE, Microsoft Exchange MVP 
Pentech Office Solutions Inc 
Tel:  585 586 3890
Cell: 585 576 4750
Fax:  585 249 0316 
www.4mcts.com 
www.exchangetrainer.com 



-----Original Message-----
From: giordanocontigiani@xxxxxxxxxxxxxxxxx
[mailto:giordanocontigiani@xxxxxxxxxxxxxxxxx] 
Sent: Saturday, September 13, 2003 3:48 AM
To: [ExchangeList]

http://www.MSExchange.org/

RFC 822 require that SMTP server accept addres like "name@[1.2.3.4]", where
mail domain is a dtext within brackets. My exchange 2000 server dont accept
this type of address (there is a manner to configure this?), second question
outlook client dont permit to send to this address (outlook express permit
it) thanks for any info regards giordano contigiani sys admin

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