Panasonic Workio DP-3030, Service Manual

Page: 406 / 486

406
DP-2330/3030
MAR 2005
Ver.2.1
DP-2310/3010
9.5.5. A (Address) Record
The A (Address) Record, lists the addresses for a given machine. The name field is the machine’s name
and the address is the network address. There should be one A record for each address on the machine.
9.5.6. PTR (Pointer) Record
Pointer records are the reverse-lookup file entries that enable IP addresses to be resolved to host names.
DNS is used to resolve host names to IP addresses, so the opposite process is called reverse lookup.
They specify the IP address in reverse order (like a DNS name, with the most specific information first) and
then corresponding host name. The files are named according to the class of network, but with the octets in
reverse order. The syntax for a PTR record is shown below:
<ip reverse domain name> IN PTR <host name>
9.5.7. CNAME (Canonical Name) Record
The CNAME (or canonical name) record is an alias (nickname), enabling you to specify more than one
name for each IP address. The syntax of a CNAME is shown below:
<alias name> CNAME <host name>
Using CNAME records, you can combine an FTP and a Web server on the same host. Nicknames are
useful when a well-known host changes its name. In this case, its usually a good idea to have a CNAME
record so people still using the old name, will get to the right place.
A Record (Bind 4.9.5 for NT) in "db zone.info" file
; BIND version named 4.9.5-Rel+-Monday-dd-Month-yy
; BIND version GregSchueman-LarryKahn-VirajBais
; zone ' rdmg.pcc.co.jp' last serial 720
; from 133.185.245.7 at Sun Mmm dd:11:35 yyyy
$ORIGIN pcc.co.jp.
rdmg IN SOA nwmgr.pcc.co.jp. postmaster.rdmg.pcc.co.jp. (
721 10800 3600 604800 86400 )
IN NS nwmgr.pcc.co.jp.
IN MX 10 mlsv2.rdmg.pcc.co.jp.
$ORIGIN rdmg.pcc.co.jp.
ifax-gz03 IN A 172.21.94.216
qmc-cco1 IN A 133.185.254.212
ifaxos01
ifpdyna
IN A 202.244.202.29
IN A 172.21.97.26
PTR record (Bind 4.9.5 for NT) in "db.127.0.0" file.
IN NS nwr42.rdmg.pcc.co.jp.
1 IN PTR localhost.rdmg.pcc.co.jp.
;