PPT Slide

12-11

Domain Name Groper: dig

Used to gather lots of information on hostsfrom DNS

noc2% dig noc2

; <<>> DiG 2.2 <<>> noc2

;; res options: init recurs defnam dnsrch

;; got answer:

;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 6

;; flags: qr aa rd ra; Ques: 1, Ans: 0, Auth: 1, Addit: 0

;; QUESTIONS:

;; noc2, type = A, class = IN

;; AUTHORITY RECORDS:

. 86400 SOA A.ROOT-SERVERS.NET. hostmaster.INTERNIC.NET. (

1998091500 ; serial

1800 ; refresh (30 mins)

900 ; retry (15 mins)

604800 ; expire (7 days)

86400 ) ; minimum (1 day)

;; Total query time: 141 msec

;; FROM: noc2.btc.gatech.edu to SERVER: default -- 199.77.147.28

;; WHEN: Wed Sep 16 21:42:11 1998

;; MSG SIZE sent: 22 rcvd: 95

Chapter 12

Notes

Example:

Network Management: Principles and Practice