Pada Linux Debian mulai dari versi 9 tidak disertai secara default Tools Jaringan seperti ifconfig untuk menampilkan network interface / kartu jaringan, netstat untuk menampilkan informasi network connection , nslookup dan dig untuk utility pada DNS.

Berikut perintah instalasinya :

apt install net-tools dnsutils
# ifconfig
enp0s25: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 54:ee:75:10:0a:7c  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 20  memory 0xf0500000-f0520000  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 61437  bytes 19928934 (19.0 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 61437  bytes 19928934 (19.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.100.6  netmask 255.255.255.0  broadcast 192.168.100.255
        inet6 fe80::f47f:597b:b8b4:facf  prefixlen 64  scopeid 0x20<link>
        ether e8:2a:ea:15:c1:01  txqueuelen 1000  (Ethernet)
        RX packets 959738  bytes 563946999 (537.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 3582331  bytes 4751624957 (4.4 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

# netstat
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 192.168.100.6:45686     192.0.78.23:https       ESTABLISHED
tcp        0      0 localhost:http-alt      localhost:54040         TIME_WAIT  
tcp        0      0 192.168.100.6:43914     162.125.81.3:https      ESTABLISHED
tcp        0      0 192.168.100.6:45614     162.125.81.3:https      ESTABLISHED
tcp       32      0 192.168.100.6:42470     162.125.81.3:https      CLOSE_WAIT 
tcp        0      0 192.168.100.6:58966     104.18.53.40:https      ESTABLISHED
tcp        0    708 192.168.100.6:43124     162.125.81.3:https      ESTABLISHED
tcp        0      1 192.168.100.6:48020     192.168.53.5:nrpe       SYN_SENT   
tcp        0      0 192.168.100.6:60968     162.125.34.129:https    ESTABLISHED
tcp        1      0 192.168.100.6:48558     ec2-3-81-154-63.c:https CLOSE_WAIT 
tcp        0      0 192.168.100.6:51272     162.125.81.10:https     ESTABLISHED
tcp       32      0 192.168.100.6:45676     162.125.81.3:https      CLOSE_WAIT 
tcp        0      0 192.168.100.6:43916     162.125.81.3:https      ESTABLISHED
tcp        1      0 192.168.100.6:42410     ec2-34-195-170-15:https CLOSE_WAIT 
tcp        0      1 192.168.100.6:48028     192.168.53.5:nrpe       SYN_SENT   
tcp        0      0 localhost:59032         localhost:41121         TIME_WAIT  
tcp       32      0 192.168.100.6:36558     162.125.81.7:https      CLOSE_WAIT

# nslookup molaviarman.net
Server:		192.168.100.1
Address:	192.168.100.1#53

Non-authoritative answer:
Name:	molaviarman.net
Address: 104.18.53.40
Name:	molaviarman.net
Address: 104.18.52.40
Name:	molaviarman.net
Address: 2606:4700:30::6812:3528
Name:	molaviarman.net
Address: 2606:4700:30::6812:3428

[email protected]:/home/mlv# dig molaviarman.net

; <<>> DiG 9.11.5-P4-5-Debian <<>> molaviarman.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59479
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;molaviarman.net.		IN	A

;; ANSWER SECTION:
molaviarman.net.	296	IN	A	104.18.53.40
molaviarman.net.	296	IN	A	104.18.52.40

;; Query time: 1 msec
;; SERVER: 192.168.100.1#53(192.168.100.1)
;; WHEN: Wed Jun 12 05:52:56 WIB 2019
;; MSG SIZE  rcvd: 65