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Unix Networking Utilites

dig

This command will show you network information.

At the command prompt type the following:

dig wam.umd.edu

The following will appear:

; <<>> DiG 2.2 <<>> wam.umd.edu
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6
;; flags: qr rd ra; Ques: 1, Ans: 1, Auth: 4, Addit: 4M
;; QUESTIONS:
;;      wam.umd.edu, type = A, class = IN

;; ANSWERS:
wam.umd.edu. 134     A       128.8.10.95

;; AUTHORITY RECORDS:
UMD.EDU.        43169   NS      noc.net.UMD.EDU.
UMD.EDU.        43169   NS      ns1.UMD.EDU.
UMD.EDU.        43169   NS      ns2.UMD.EDU.
UMD.EDU.        43169   NS      mx.nsi.nasa.gov.

;; ADDITIONAL RECORDS:
noc.net.UMD.EDU.        7169    A       129.2.0.3
ns1.UMD.EDU.    59969   A       128.8.74.2
ns2.UMD.EDU.    59969   A       128.8.76.2
mx.nsi.nasa.gov.        5113    A       128.102.18.31

;; Total query time: 4 msec
;; FROM: wam.umd.edu to SERVER: default -- 128.8.10.95
;; WHEN: Fri Dec 10 13:00:54 1999
;; MSG SIZE  sent: 32  rcvd: 206

host

This command will show you the differenc rac information and any aliases. Also will give you mail information.

At the prompt type the following:

host wam.umd.edu

The following will appear:

wam.umd.edu has address 128.8.10.150
wam.umd.edu has address 128.8.10.143
wam.umd.edu has address 128.8.10.149
wam.umd.edu has address 128.8.10.142
wam.umd.edu has address 128.8.10.144
wam.umd.edu mail is handled (pri=4) by po0.wam.umd.edu
wam.umd.edu mail is handled (pri=4) by po1.wam.umd.edu
wam.umd.edu mail is handled (pri=4) by po2.wam.umd.edu

nslookup

This command name will show you the server name and IP address.

First log into your wam/glue account. Then at the prompt type:

nslookup servername
or
nslookup IP address
and hit return

This is the following output for a wam lookup:

Server:  altair.umd.edu
Address:  128.8.10.95
Name:    wam.umd.edu
Addresses:  128.8.10.147, 128.8.10.148, 128.8.10.145, 128.8.10.143
          128.8.10.146

ping

This command will check to see if a server is alive, or not. As well as obtaining information about that specific server.

First log into your wam/glue account. Then at the prompt type:

ping servername
and hit return

You will see if the system is alive as shown below.

wam.umd.edu is alive

If you are looking for the return time on a ping, then simply type at the prompt:

ping -sv servername
and hit return

You will get the following information returned to you by the system:

	64 bytes from wam.umd.edu (128.8.10.141): icmp_seq=0. time=0. ms
	64 bytes from wam.umd.edu (128.8.10.141): icmp_seq=1. time=0. ms
	64 bytes from wam.umd.edu (128.8.10.141): icmp_seq=2. time=0. ms

When you have obtained sufficient information then type control+c to exit the ping.