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nameserver 192.168.1.100
nameserver 192.168.1.101
Table-6. Resolv.conf file entries.
The domain and search criteria are optional and only useful if running authoritative DNS servers in a network. Since I am running
primary and secondary, master and slave DNS servers I have both domain and search listed with dual name server addresses pointing
to both of them on my local network. If in a SOHO setup, the DNS servers for the ISP maybe the preferred choice of entry here.
Testing we can use nslookup or dig tools, but this is not necessary as pinging a domain should result in replies provided that the server
has ICMP echo reply enabled. An example of these tools can be seen below:
root@Compaq2230s:~# ping -c 5 www.google.com
PING www.l.google.com (209.85.129.147) 56(84) bytes of data.
64 bytes from fk-in-f147.google.com (209.85.129.147): icmp_seq=1 ttl=245 time=26.4 ms
64 bytes from fk-in-f147.google.com (209.85.129.147): icmp_seq=2 ttl=245 time=26.2 ms
64 bytes from fk-in-f147.google.com (209.85.129.147): icmp_seq=3 ttl=245 time=26.8 ms
64 bytes from fk-in-f147.google.com (209.85.129.147): icmp_seq=4 ttl=245 time=26.7 ms
64 bytes from fk-in-f147.google.com (209.85.129.147): icmp_seq=5 ttl=245 time=24.3 ms
--- www.l.google.com ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4004ms
rtt min/avg/max/mdev = 24.331/26.115/26.820/0.916 ms
root@Compaq2230s:~# nslookup www.google.com
Server: 192.168.1.100
Address:192.168.1.100#53
Non-authoritative answer:
www.google.comcanonical name = www.l.google.com.
Name: www.l.google.com
Address: 209.85.129.104
Name: www.l.google.com
Address: 209.85.129.147
Name: www.l.google.com
Address: 209.85.129.99
root@Compaq2230s:~# dig @192.168.1.100 www.google.com
; <<>> DiG 9.5.1-P2 <<>> @192.168.1.100 www.google.com
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31674
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 6, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 0 IN CNAME www.l.google.com.
www.l.google.com. 233 IN A 209.85.129.99
www.l.google.com. 233 IN A 209.85.129.104
www.l.google.com. 233 IN A 209.85.129.147
;; AUTHORITY SECTION:
l.google.com. 41142 IN NS b.l.google.com.
l.google.com. 41142 IN NS f.l.google.com.
l.google.com. 41142 IN NS d.l.google.com.
l.google.com. 41142 IN NS e.l.google.com.
l.google.com. 41142 IN NS g.l.google.com.
l.google.com. 41142 IN NS a.l.google.com.
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