[CentOS] 10. DNS - 권한 위임 구성

🔔 DNS 권한 위임

---

상위 도메인에 소속된 하위 도메인에게 해당 도메인의 관리, 서비스 권한을 위임 함(상위 도메인 → 하위 도메인의 NS 레코드 추가, 하위 도메인 → 위임 받은 도메인의 레코드 생성)

• 예시로 www.b2.a2.com. 도메인의 권한 위임

  • .(root) 도메인 : com. 도메인의 NS 레코드 추가

  • com. 도메인 : a2.com. 도메인의 NS 레코드 추가

  • a2.com. 도메인 : b2.a2.com. 도메인의 NS 레코드 추가

  • b2.a2.com. 도메인 : www , host의 A 레코드 추가

■ .(root) 네임 서버 구성

■ com. 네임 서버 구성

■ a2.com. 네임 서버 구성

■ b2.a2.com. 네임 서버 구성

🔔 테스트 구성

---

■ naver.com. DNS 서버 설정

$ vim /etc/named.conf

    # 변경
    listen-on port 53 { any; };
    listen-on-v6 port 53 { any; };
    allow-query     { any; };

    dnssec-enable no;
    dnssec-validation no;


$ vim /etc/named.rfc1912.zones

# 추가
zone "naver.com" IN {
        type master;
        file "naver.com.zone";
};


$ cat /var/named/naver.com.zone
$TTL 86400
@   IN  SOA     ns.naver.com. root.naver.com. (
        2022081001  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
        IN  NS      ns.naver.com.

ns      IN  A       192.168.219.10
www     IN  A       192.168.219.13
ftp     IN  A       192.168.219.18


# DNS Root hint 설정
$ cat /var/named/named.ca

~(생략)~

;; ANSWER SECTION:
# 추가
.                       518400  IN      NS      a.root-servers.net.

~(생략)~

;; ADDITIONAL SECTION:
# 추가
a.root-servers.net.     518400  IN      A       192.168.219.20

~(생략)~


$ systemctl restart named


# 방화벽 DNS 서비스 허용
$ firewall-cmd --add-service=dns; firewall-cmd --runtime-to-permanent

■ .(root) DNS 서버 설정

$ vim /etc/named.conf

    # 변경
    listen-on port 53 { any; };
    listen-on-v6 port 53 { any; };
    allow-query     { any; };

    dnssec-enable no;
    dnssec-validation no;


$ vim /etc/named.rfc1912.zones

# 추가
zone "." IN {
        type master;
        file "root.zone";
};


$ vim /var/named/root.zone

$TTL 86400
@   IN  SOA     ns. root. (
        2022081001  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
        IN  NS      ns.
com     IN  NS      ns.com.

ns      IN  A       192.168.219.20
ns.com  IN  A       192.168.219.30


$ systemctl restart named


# 방화벽 DNS 서비스 허용
$ firewall-cmd --add-service=dns; firewall-cmd --runtime-to-permanent

■ com. DNS 서버 설정

$ vim /etc/named.conf

    # 변경
    listen-on port 53 { any; };
    listen-on-v6 port 53 { any; };
    allow-query     { any; };

    dnssec-enable no;
    dnssec-validation no;


$ vim /etc/named.rfc1912.zones

# 추가
zone "com" IN {
        type master;
        file "com.zone";
};


$ vim /var/named/root.zone

$TTL 86400
@   IN  SOA     ns.com. root.com. (
        2022081001  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
        IN  NS      ns.com.
google  IN  NS      ns.google.com.

ns              IN  A       192.168.219.30
ns.google       IN  A       192.168.219.40


$ systemctl restart named


# 방화벽 DNS 서비스 허용
$ firewall-cmd --add-service=dns; firewall-cmd --runtime-to-permanent

■ google.com. DNS 서버 설정

$ vim /etc/named.conf

    # 변경
    listen-on port 53 { any; };
    listen-on-v6 port 53 { any; };
    allow-query     { any; };

    dnssec-enable no;
    dnssec-validation no;


$ vim /etc/named.rfc1912.zones

# 추가
zone "google.com" IN {
        type master;
        file "google.com.zone";
};


$ vim /var/named/root.zone

$TTL 86400
@   IN  SOA     ns.google.com. root.google.com. (
        2022081001  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
        IN  NS      ns.google.com.

ns      IN  A       192.168.219.40
www     IN  A       192.168.219.45
ftp     IN  A       192.168.219.48


$ systemctl restart named


# 방화벽 DNS 서비스 허용
$ firewall-cmd --add-service=dns; firewall-cmd --runtime-to-permanent

■ 결과 확인

$ dig www.google.com @192.168.219.10

; <<>> DiG 9.16.23-RH <<>> www.google.com @192.168.219.10
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38538
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 9e86e8f2c796d2e101000000643f8e7abb50772541ed9edb (good)
;; QUESTION SECTION:
;www.google.com.                        IN      A

;; ANSWER SECTION:
www.google.com.         85045   IN      A       192.168.219.45

;; Query time: 0 msec
;; SERVER: 192.168.219.10#53(192.168.219.10)
;; WHEN: Wed Apr 19 15:47:22 KST 2023
;; MSG SIZE  rcvd: 87


$ dig www.naver.com @192.168.219.10

; <<>> DiG 9.16.23-RH <<>> www.naver.com @192.168.219.10
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17135
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: ed4211cf7ffbf70101000000643f8ebbf83d38a17073565e (good)
;; QUESTION SECTION:
;www.naver.com.                 IN      A

;; ANSWER SECTION:
www.naver.com.          86400   IN      A       192.168.219.13

;; Query time: 0 msec
;; SERVER: 192.168.219.10#53(192.168.219.10)
;; WHEN: Wed Apr 19 15:48:28 KST 2023
;; MSG SIZE  rcvd: 86

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