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[네임서버] DNS 질의 시 TIME OUT 시간(s)

변군 변군이글루 2013. 6. 21. 15:18

DNS 질의 시 TIME OUT 시간(s)

1. DNS 1 (정상DNS) : 바로 질의 성공

# vi /etc/resolv.conf

nameserver 168.126.63.1

 

# time nslookup sangcheol.kr

Server: 10.0.1.2

Address: 10.0.1.2#53

 

Non-authoritative answer:

Name: sangcheol.kr

Address: 222.231.8.226

real 0m0.025s

 

2. DNS 1 (DNS 비정상) : 5s + 5s + 5s =15s

# vi /etc/resolv.conf

nameserver 168.1.2.3

 

# time nslookup sangcheol.kr

;; connection timed out; no servers could be reached

real 0m15.016s

 

3. DNS 2 (DNS 비정상, DNS 정상) : 1 DNS 질의 실패 1초 후 2 DNS 로 질의

# vi /etc/resolv.conf

nameserver 168.1.2.3

nameserver 168.126.63.1

 

# time nslookup sangcheol.kr

Server: 10.0.1.2

Address: 10.0.1.2#53

 

Non-authoritative answer:

Name: sangcheol.kr

Address: 222.231.8.226

real 0m1.018s

 

4. DNS 2 (DNS 비정상, DNS 비정상) : 1s+5s + 1s+5s + 1s+5s = 18s

# vi /etc/resolv.conf

nameserver 168.1.2.3

nameserver 168.1.2.4

 

# time nslookup sangcheol.kr

;; connection timed out; no servers could be reached

real 0m18.023s

 

5. DNS 3 (DNS 비정상, DNS 비정상, DNS 비정상) : 1s+1s+5s + 1s+1s+5s + 1s+1s+5s = 21s

# vi /etc/resolv.conf

nameserver 168.1.2.3

nameserver 168.1.2.4

nameserver 168.1.2.5

 

# time nslookup sangcheol.kr

;; connection timed out; no servers could be reached

real 0m21.027s

 

 

 

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