TCP/IP Model

ping

The most basic command used for determine if able to reach destination and also latency. It bases on ICMP protocal.

• Ping able be disabled if destination disable ICMP protocal.

telnet

Use for check the destination port

• Telnet able to used for identiy if destination port is opened.

ipconfig/ifconfig

To get current network IP and the IP of gateway that we’re connecting

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Wireless LAN adapter Wi-Fi:

   Connection-specific DNS Suffix  . :
   Link-local IPv6 Address . . . . . : fe80::94c:63fe:66c8:2416%12
   IPv4 Address. . . . . . . . . . . : 194.168.182.210
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 194.168.182.1

• IPv4 Address : the current IP that get assigned by router
• Default Gateway : IP of router

route table

Route table is the set of rules that used for determind the destination of data package on IP address command : netstat -rn

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Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         10.244.1.1      0.0.0.0         UG        0 0          0 eth0
10.244.1.0      0.0.0.0         255.255.255.0   U         0 0          0 eth0

ngrok

ngrok helps create reverse proxy and point to local pc and also give public IP temporary.

• Local development with webhook API(Line bot, Zoom chat)

Advance network tools

• Zenmap (nmap GUI)
• Wireshark