Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 04-08-2006 Installation Manual page 649

taken first and, if mail delivery to this server fails, an attempt is made with the next
higher value.
Lines 12–17:
These are the actual address records where one or more IP addresses are assigned
to hostnames. The names are listed here without a . because they do not include
their domain, so world.cosmos is added to all of them. Two IP addresses are
assigned to the host gateway, because it has two network cards. Wherever the
host address is a traditional one (IPv4), the record is marked with A. If the address
is an IPv6 address, the entry is marked with A6. The previous token for IPv6 ad-
dresses was AAAA, which is now obsolete.
NOTE: A6 Syntax
The A6 record has a slightly different syntax than AAAA. Because of the
fragmentation possibility, it is necessary to provide information about
missed bits before the address. You must provide this information even if
you want to use a completely unfragmented address. For the old AAAA
record with the syntax
pluto IN
pluto IN
You need to add information about missing bits in A6 format. Because the
example above is complete (does not miss any bits), the A6 format of this
record is:
pluto IN
pluto IN
Do not use IPv4 addresses with IPv6 mapping. If a host has an IPv4 address,
it uses an A record, not an A6.
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The alias www can be used to address mond (CNAME means canonical name).
The pseudodomain in-addr.arpa is used for the reverse lookup of IP addresses
into hostnames. It is appended to the network part of the address in reverse notation.
So 192.168.1 is resolved into 1.168.192.in-addr.arpa. See
"Reverse Lookup" (page 650).
AAAA 2345:00C1:CA11:0001:1234:5678:9ABC:DEF0
AAAA 2345:00D2:DA11:0001:1234:5678:9ABC:DEF0
AAAA 0 2345:00C1:CA11:0001:1234:5678:9ABC:DEF0
AAAA 0 2345:00D2:DA11:0001:1234:5678:9ABC:DEF0
Example 34.7,
The Domain Name System 649