RE: address with brackets

  • From: "John Tolmachoff \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
  • To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 15 Sep 2003 13:36:14 -0700

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John Tolmachoff MCSE CSSA
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eServices For You
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> -----Original Message-----
> From: Mulnick, Al [mailto:Al.Mulnick@xxxxxxxxxx]
> Sent: Monday, September 15, 2003 1:15 PM
> To: [ExchangeList]
> Subject: [exchangelist] RE: address with brackets
> 
> http://www.MSExchange.org/
> 
> I've read that as well, but I still don't see the value of the
> domain-literal addressing sequence and this doesn't help to explain it.
> >From that RFC (which, as far as I'm concerned is really ineffectual since
> many hosts are still only RFC 821/822 compliant and don't know of
2821/2822
> comments yet):
> 
> 
> 4.1.3 Address Literals
> 
>    Sometimes a host is not known to the domain name system and
>    communication (and, in particular, communication to report and repair
>    the error) is blocked.  To bypass this barrier a special literal form
>    of the address is allowed as an alternative to a domain name.  For
>    IPv4 addresses, this form uses four small decimal integers separated
>    by dots and enclosed by brackets such as [123.255.37.2], which
>    indicates an (IPv4) Internet Address in sequence-of-octets form.  For
>    IPv6 and other forms of addressing that might eventually be
>    standardized, the form consists of a standardized "tag" that
>    identifies the address syntax, a colon, and the address itself, in a
>    format specified as part of the IPv6 standards [17].
> 
>    Specifically:
> 
>       IPv4-address-literal = Snum 3("." Snum)
>       IPv6-address-literal = "IPv6:" IPv6-addr
>       General-address-literal = Standardized-tag ":" 1*dcontent
>       Standardized-tag = Ldh-str
>             ; MUST be specified in a standards-track RFC
>             ; and registered with IANA
> 
>       Snum = 1*3DIGIT  ; representing a decimal integer
>             ; value in the range 0 through 255
>       Let-dig = ALPHA / DIGIT
>       Ldh-str = *( ALPHA / DIGIT / "-" ) Let-dig
> 
>       IPv6-addr = IPv6-full / IPv6-comp / IPv6v4-full / IPv6v4-comp
>       IPv6-hex  = 1*4HEXDIG
>       IPv6-full = IPv6-hex 7(":" IPv6-hex)
>       IPv6-comp = [IPv6-hex *5(":" IPv6-hex)] "::" [IPv6-hex *5(":"
>                  IPv6-hex)]
>             ; The "::" represents at least 2 16-bit groups of zeros
>             ; No more than 6 groups in addition to the "::" may be
>             ; present
>       IPv6v4-full = IPv6-hex 5(":" IPv6-hex) ":" IPv4-address-literal
>       IPv6v4-comp = [IPv6-hex *3(":" IPv6-hex)] "::"
> 
>                    [IPv6-hex *3(":" IPv6-hex) ":"] IPv4-address-literal
>             ; The "::" represents at least 2 16-bit groups of zeros
>             ; No more than 4 groups in addition to the "::" and
>             ; IPv4-address-literal may be present
> 
> In theory, this sounds great and everybody should go away happy.  In
> practice, if I have the IP address, where'd it come from? If I have an A
RR
> why can't I route to the domain that way?  How do I scale that with
mulitple
> mail hosts?
> 
> I suppose I can answer my question by putting a link on my web page for
> abuse such as abuse@[....] but that begs the question of how people get to
> my web page without my DNS?  It starts to become circular logic after a
> brief amount of thought.  About the only place I could put this address
> would be on my WHOIS records, and that can be hacked (and has) and often
> isn't up to date anyway.  Why bother?  I don't see the value.
> 
> I'd love it if somebody can point out the value and useful implementations
> of such an address.  'Till then I'll continue to believe this is wrong and
> the world is flat ;)
> 
> 
> Al
> 
> 
> 
> -----Original Message-----
> From: Mark Fugatt [mailto:mark@xxxxxxxxx]
> Sent: Monday, September 15, 2003 2:57 PM
> To: [ExchangeList]
> Subject: [exchangelist] RE: address with brackets
> 
> 
> http://www.MSExchange.org/
> 
> I would recommend taking a look at this RFC:
> http://www.faqs.org/rfcs/rfc2821.html
> 
> 
> 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: Mulnick, Al [mailto:Al.Mulnick@xxxxxxxxxx]
> Sent: Monday, September 15, 2003 12:06 PM
> To: [ExchangeList]
> 
> http://www.MSExchange.org/
> 
> 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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