RR
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This memo defines a new DNS RR type for experimental purposes. This
RFC describes a mechanism to allow the DNS ...
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;; network LOC RR derived from ZIP data. note use of precision defaults
cambridge-net.kei.com. LOC 42 21 54 N 71 06 18 W -24m 30m
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;; higher-precision host LOC RR. note use of vertical precision default
loiosh.kei.com. LOC 42 21 43.952 N 71 5 6.344 W
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... Application use of the LOC RR ...
... IP packet, and network management
applications that could use LOC RRs to generate a map of hosts and
routers ...
... less precise or larger area when a host does not have an associated
LOC RR, it MAY support use of the algorithm in section 5.2.3, as
noted in sections 5.2.1 and 5.2.2. If fallback is desired, this
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... specify the location of a network or subnet without requiring LOC RR
data for each individual host. For example, a computer lab with 24
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... workstations, all of which are on the same subnet and in basically
the same location, would only need a LOC RR for the subnet.
(However, if the file server's location has been more precisely
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... subnet.
(However, if the file server's location has been more precisely
measured, a separate LOC RR for it can be placed in the DNS.)
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... backbone flow maps do), it MUST check for a
LOC RR associated with that name. (CNAME records should be followed
as for any other RR ...
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If there is no LOC RR for that name, all A records (if any)
associated with the name MAY be checked for network ...
... network or subnet LOC
RRs, the application may choose to use any, some, or all of the LOC
RRs found, possibly in combination. It is suggested that multi-homed
hosts ...
... RRs, the application may choose to use any, some, or all of the LOC
RRs found, possibly in combination. It is suggested that multi-homed
hosts have LOC RRs for their name in the DNS ...
... RRs found, possibly in combination. It is suggested that multi-homed
hosts have LOC RRs for their name in the DNS to avoid any ambiguity
in these cases.
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... domain names that do not have associated A records must
have a LOC RR associated with their name in order for location
information to be accessible.
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... namespace (see[RFC 1034], section
5.2.1), then check for a LOC RR associated with that name.
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... followed to find a network or subnet LOC RR associated with the IP
address. This algorithm is adapted slightly from that specified in
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... RRs are (if present) more specific than network LOC
RRs, it is best to use them if available. In order to do so, we
build a stack of network and subnet ...
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Push the name "isi-net.isi.edu" onto the stack of names to be
searched for LOC RRs later.
3. Since an A RR ...
... RRs later.
3. Since an A RR was found, repeat using mask from RR
(255.255.255.0), constructing a query ...
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3. Since an A RR was found, repeat using mask from RR
(255.255.255.0), constructing a query for 0.2.9.128.IN-ADDR.ARPA ...
... Push the name "div2-subnet.isi.edu" onto the stack of names to be
searched for LOC RRs later.
4. Since another A RR ...
... RRs later.
4. Since another A RR was found, repeat using mask 255.255.255.240
(x'FFFFFFF0'), constructing a query for 16.2.9.128.IN-ADDR.ARPA ...
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Push the name "inc-subsubnet.isi.edu" onto the stack of names to
be searched for LOC RRs later.
5. Since no A RR ...
... RRs later.
5. Since no A RR is present at 16.2.9.128.IN-ADDR.ARPA., there are no
more subnet ...
... subnet levels to search. We now pop the top name from the
stack and check for an associated LOC RR. Repeat until a LOC RR
is found.
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... search. We now pop the top name from the
stack and check for an associated LOC RR. Repeat until a LOC RR
is found.
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In this case, assume that inc-subsubnet.isi.edu does not have an
associated LOC RR, but that div2-subnet.isi.edu does. We will
then use div2-subnet ...
... subnet.isi.edu does. We will
then use div2-subnet.isi.edu's LOC RR as an approximation of this
host's location. (Note that even if isi-net.isi.edu has a LOC RR ...
... RR as an approximation of this
host's location. (Note that even if isi-net.isi.edu has a LOC RR,
it will not be used if a subnet also has a LOC RR ...
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/*
* routines to convert between on-the-wire RR format and zone file
* format. Does not contain conversion to/from decimal degrees;
* divide or multiply by 60*60*1000 for that.
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... PUTLONG(alt,bcp);
return (16); /* size of RR in octets */
}
...
... }
/* takes an on-the-wire LOC RR and prints it in zone file
* (human readable) format. */
char *
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