host
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... domain names
As applications grow to span multiple hosts, then networks, and
finally internets, these applications must also span multiple
...
... Internet illustrates the size-related problems; it is a
large system and is likely to grow much larger. The need to have
a mapping between host names (e.g., USC-ISIF) and ARPA Internet
addresses (e.g., 10.2.0.52) is beginning to stress the existing
...
... ARPA Internet
addresses (e.g., 10.2.0.52) is beginning to stress the existing
mechanisms. Currently hosts in the ARPA Internet are registered
...
... Network Information Center (NIC) and listed in a global
table (available as the file <NETINFO>HOSTS.TXT on the SRI-NIC
host ...
... HOSTS.TXT on the SRI-NIC
host) [1]. The size of this table, and especially the frequency
of updates to the table are near the limit of manageability. What
...
... mailbox. Some of these methods involve the use of routes and
forwarding hosts as part of the mail destination address, and
consequently force the mail user to know multiple address ...
... The costs of implementing such a facility dictate that it be
generally useful, and not restricted to a single application.
We should be able to use names to retrieve host addresses,
mailbox ...
... resources return ARPA Internet host addresses. However, to
preserve the generality of the domain ...
... domain names
are not required to have a one-to-one correspondence with host
names, host addresses, or any other type of information.
...
... are not required to have a one-to-one correspondence with host
names, host addresses, or any other type of information.
...
... The size of the total database will initially be proportional
to the number of hosts using the system, but will eventually
grow to be proportional to the number of users on those hosts
...
... to the number of hosts using the system, but will eventually
grow to be proportional to the number of users on those hosts
as mailboxes and other information are added to the domain ...
... mailbox bindings, host addresses), but that the system should
be able to deal with subsets that change more rapidly (on the
...
... for the database will usually correspond to organizations that
have one or more hosts. Each organization that has
responsibility for a particular set of domains will provide
...
... responsibility for a particular set of domains will provide
redundant name servers, either on the organization's own hosts
or other hosts that the organization arranges to use.
...
... redundant name servers, either on the organization's own hosts
or other hosts that the organization arranges to use.
Clients ...
... unavailable due to
network or host failure, the usual course is to believe old
information while continuing efforts to update it. The general
...
... The domain system assumes that all data originates in master files
scattered through the hosts that use the domain system. These
master files are updated by local system ...
... 14].
The standard format allows these files to be exchanged between
hosts (via FTP, mail, or some other mechanism); this facility is
useful when an organization wants a domain ...
... support a name server. The organization can maintain the master
files locally using a text editor, transfer them to a foreign host
which runs a name server, and then arrange with the system
administrator ...
...
Each host's name servers and resolvers are configured by a local
system administrator. For a name server ...
... record, and hence the "owner" of the information. For example,
a RR that specifies a host address has a domain name the
...
... in this resource record. Types refer to abstract resources
such as host addresses or mail delivery agents. The type field ...
... and pass on records which they cannot interpret. The format of
the internal data is restricted only by the maximum length of
65535 octets; for example the host address record might specify
a fixed 32 bit ...
... This memo uses the following types in its examples:
A - the host address associated with the domain name
...
... The first type of resource record holds a host name to host
address binding. Its fields are:
...
... bit ARPA Internet address of the host, for the CSNET it might be
the phone number of the host ...
... host, for the CSNET it might be
the phone number of the host. For example, F.ISI.ARPA might have
two A records ...
... The <domain name> field is a domain name of the host that will
handle mail; note that this domain name may be completely
...
... These records mean that mail for F.ISI.ARPA can either be
delivered to the host F.ISI.ARPA or forwarded to B.ISI.ARPA, which
...
... principle, an additional name lookup is required to map the domain
name of the host to the appropriate address, in practice this
information is usually returned in the response to the mail query ...
... name server for a domain reside in
a host which has a name in the same domain, although this will
usually be the case. There is also no restriction on the number
...
... method is to store the information acquired by a
resolver when the resolver consults other name servers. In a
sophisticated host, the resolver and name server will coordinate
their actions and use a shared database ...
... update the domain related information, and to resolve any problems
(e.g., protocol violations) with hosts in the domain.
...
... servers must be accessible from outside the domain (as well as
inside) and must resolve names for at least all the hosts in the
domain.
...
... The appropriate information is defined in [14], but generally
consists of host to address bindings for domain names in returned
...
...
In existing systems, hosts and other resources often have several
names that identify the same resource. For example, under current
ARPA ...
... ARPA Internet naming support, USC-ISIF and ISIF both identify the
same host. Similarly, in the case of mailboxes, many
organizations provide many names that actually go to the same
...
... and denote that the master data for the zone of authority is
originally from this host. The first three NS records denote
delegation ...
... query might map a domain name
to a host address, the corresponding inverse query might map the
...
... domain system is organized by
domain name rather than by host address or any other resource
type. In general, a resolver or other program that wishes to
...
... For example, if a resolver wishes to perform an inverse query for
an arbitrary host on the ARPA Internet, it must consult a set of
...
... system to fill in other arguments. For example, many mail systems
allow the user to specify a username without a host for local mail
delivery.
...
... FTP) in the form of a
subroutine call, system call etc., and returns the desired
information in a form compatible with the local host's data
formats.
...
... classes supported by the client. Note that in either
case, the resolver must understand the preferences of the host.
For example, the host that supports both CSNET and ARPA ...
... case, the resolver must understand the preferences of the host.
For example, the host that supports both CSNET and ARPA
...
...
The labels must follow the rules for ARPANET host names. They must
start with a letter, end with a letter or digit, and have as interior
...
... restrictions on the length. Labels must be 63 characters or less.
For example, the following strings identify hosts in the ARPA
Internet ...
... E. Feinler, K. Harrenstien, Z. Su, and V. White, "DOD Internet Host Table Specification", RFC 810(-> 952), Network Information Center, SRI International, March 1982. ...