September 2005
Beginner
462 pages
12h 56m
English
Content preview from Essential SNMP, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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nslookup and dig
nslookup, found on Unix and Windows systems, is used to get IP address information on a host, and vice versa:
C:\>nslookup www.yahoo.comServer: ns1.mindspring.com Address: 207.69.188.185 Non-authoritative answer: Name: www.yahoo.akadns.net Addresses: 216.109.118.75, 216.109.118.77, 216.109.118.78, 216.109.118.79 216.109.118.65, 216.109.118.66, 216.109.118.69, 216.109.118.73 Aliases: www.yahoo.com C:\>nslookup 216.109.118.75Server: ns1.mindspring.com Address: 207.69.188.185 Name: p12.www.dcn.yahoo.com Address: 216.109.118.75
While nslookup has been widely used on Unix systems for many, many years, nslookup is being deprecated on Linux systems. Instead of nslookup, Linux systems now make use of a command called dig (dig stands for Domain Internet Groper).
Let's look at some example usage of dig:
$dig @69.15.40.52 www.yahoo.com; <<>> DiG 9.2.4 <<>>@69.15.40.52 www.yahoo.com;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7406 ;; flags: qr rd ra; QUERY: 1, ANSWER: 9, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.yahoo.com. IN A ;; ANSWER SECTION: www.yahoo.com. 300 IN CNAME www.yahoo.akadns.net. www.yahoo.akadns.net. 60 IN A 68.142.226.34 www.yahoo.akadns.net. 60 IN A 68.142.226.56 www.yahoo.akadns.net. 60 IN A 68.142.226.44 www.yahoo.akadns.net. 60 IN A 68.142.226.45 www.yahoo.akadns.net. 60 IN A 68.142.226.38 www.yahoo.akadns.net. 60 IN A 68.142.226.47 www.yahoo.akadns.net. 60 IN A 68.142.226.39 www.yahoo.akadns.net. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.