www.debian.org instead of 130.89.148.77 or 2001:67c:2564:a119::77.
A (address record): IPv4 address. This is the most common form to point a domain to an IPv4 address.
CNAME (canonical name record): alias
MX (mail exchange): an email server. This information is used by other email servers to find where to send email addressed to a given address. Each MX record has a priority. The highest-priority server (with the lowest number) is tried first (see sidebar 「BACK TO BASICS SMTP」); other servers are contacted in order of decreasing priority if the first one does not reply.
PTR (pointer): mapping of an IP address to a name. Such a record is stored in a “reverse DNS” zone named after the IP address range. For example, 1.168.192.in-addr.arpa is the zone containing the reverse mapping for all addresses in the 192.168.1.0/24 range.
AAAA (IPv6 address record): IPv6 address.
NS (name server): maps a name to a name server. Each domain must have at least one NS record. These records point at a DNS server that can answer queries concerning this domain; they usually point at the primary and secondary servers for the domain. These records also allow DNS delegation; for instance, the falcot.com zone can include an NS record for internal.falcot.com, which means that the internal.falcot.com zone is handled by another server. Of course, this server must declare an internal.falcot.com zone.
bind の設定ファイルは同じ構造をしています。
falcot.com ドメインに関連する情報を保存するためにプライマリ falcot.com ゾーンを作成し、ローカルネットワーク内の IP アドレスとの逆引き対応を付けるために 168.192.in-addr.arpa ゾーンを作成しました。
例 10.12 /etc/bind/named.conf.local の抜粋
zone "falcot.com" {
type master;
file "/etc/bind/db.falcot.com";
allow-query { any; };
allow-transfer {
195.20.105.149/32 ; // ns0.xname.org
193.23.158.13/32 ; // ns1.xname.org
};
};
zone "internal.falcot.com" {
type master;
file "/etc/bind/db.internal.falcot.com";
allow-query { 192.168.0.0/16; };
};
zone "168.192.in-addr.arpa" {
type master;
file "/etc/bind/db.192.168";
allow-query { 192.168.0.0/16; };
};例 10.13 /etc/bind/db.falcot.com の抜粋
; falcot.com ゾーン
; admin.falcot.com. でゾーン連絡先アドレスに admin@falcot.com を指定したことになります
$TTL 604800
@ IN SOA falcot.com. admin.falcot.com. (
20040121 ; Serial
604800 ; Refresh
86400 ; Retry
2419200 ; Expire
604800 ) ; Negative Cache TTL
;
; @ はゾーン名 (ここでは "falcot.com") または
; $ORIGIN 指示文が使われていた場合 $ORIGIN を意味します
;
@ IN NS ns
@ IN NS ns0.xname.org.
internal IN NS 192.168.0.2
@ IN A 212.94.201.10
@ IN MX 5 mail
@ IN MX 10 mail2
ns IN A 212.94.201.10
mail IN A 212.94.201.10
mail2 IN A 212.94.201.11
www IN A 212.94.201.11
dns IN CNAME ns例 10.14 /etc/bind/db.192.168 の抜粋
; 192.168.0.0/16 用の逆引きゾーン
; admin.falcot.com. でゾーン連絡先アドレスに admin@falcot.com を指定したことになります
$TTL 604800
@ IN SOA ns.internal.falcot.com. admin.falcot.com. (
20040121 ; Serial
604800 ; Refresh
86400 ; Retry
2419200 ; Expire
604800 ) ; Negative Cache TTL
IN NS ns.internal.falcot.com.
; 192.168.0.1 を arrakis に対応付けます
1.0 IN PTR arrakis.internal.falcot.com.
; 192.168.0.2 を neptune に対応付けます
2.0 IN PTR neptune.internal.falcot.com.
; 192.168.3.1 を pau に対応付けます
1.3 IN PTR pau.internal.falcot.com.