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Introduction to Linux

By Machtelt Garrels

 eunet.be. name server dns.eunet.be.

Similar information can be displayed using the dig command, which gives additional information about how records are stored in the name server.

To check if a host is alive, use ping . If your system is configured to send more than one packet, interrupt ping with the Ctrl +C key combination:


[emmy@pc10 emmy]$ ping a.host.be 
 PING a.host.be ( from 56(84) bytes of data.
 64 bytes from a.host.be( ttl=244 time=99.977msec
 --- a.host.be ping statistics ---
 1 packets transmitted, 1 packets received, 0% packet loss
 round-trip min/avg/max/mdev = 99.977/99.977/99.977/0.000 ms

To check the route that packets follow to a network host, use the traceroute command:


[emmy@pc10 emmy]$ /usr/sbin/traceroute www.eunet.be
 traceroute to www.eunet.be(,30 hops max,38b packets
 1 blob ( 
 0.297ms 0.257ms 0.174ms
 2 adsl-65.myprovider.be ( 
 12.120ms 13.058ms 13.009ms
 3 ( 
 13.845ms 14.308ms 12.756ms
 4 gigabitethernet2-2.intl2.gam.brussels.skynet.be (
 13.123ms 13.164ms 12.527ms
 5 pecbru2.car.belbone.be ( 
 16.336ms 13.889ms 13.028ms
 6 ser-2-1-110-ias-be-vil-ar01.kpnbelgium.be (
 14.602ms 15.546ms 15.959ms
 7 unknown-195-207-939.eunet.be ( 
 16.514ms 17.661ms 18.889ms
 8 S0-1-0.Leuven.Belgium.EU.net ( 
 22.714ms 19.193ms 18.432ms
 9 dukat.Belgium.EU.net ( 22.758ms * 25.263ms

Specific domain name information can be queried using the whois command, as is explained by many whois servers, like the one below:


[emmy@pc10 emmy]$ whois cnn.com
 Whois Server Version 1.3
 	$<--snap server message-->
 Domain Name: CNN.COM
 Whois Server: whois.networksolutions.com
 Referral URL: http://www.networksolutions.com
 Name Server: TWDNS-01.NS.AOL.COM
 Name Server: TWDNS-02.NS.AOL.COM
 Name Server: TWDNS-03.NS.AOL.COM
 Name Server: TWDNS-04.NS.AOL.COM
 Updated Date: 12-mar-2002
 >>> Last update of whois database: Fri, 5 Apr 2002 05:04:55 EST <<<
 The Registry database contains ONLY .COM, .NET, .ORG, .EDU domains
 and Registrars.
 $<--snap server message-->
 Turner Broadcasting (CNN-DOM)
 1 CNN Center
 Atlanta, GA 30303
 Domain Name: CNN.COM
 Administrative Contact:
 $<--snap contactinfo--> 
 Technical Contact:
 $<--snap contactinfo--> 
 Billing Contact:
 	$<--snap contactinfo-->
 Record last updated on 12-Mar-2002.
 Record expires on 23-Sep-2009.
 Record created on 22-Sep-1993.
 Database last updated on 4-Apr-2002 20:10:00 EST.
 Domain servers in listed order:

For other domain names than .com, .net, .org and .edu, specify the whois server, such as this one for .be domains:

whois domain.be@whois.dns.be

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