Search network command

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ifconfig

Check your ip address.

ifconfig | grep inet
    

nmap

Check the port used in the device and the devices connected to the same wifi.

nmap -p- 192.168.1.100 # port
#######
PORT    STATE SERVICE
22/tcp  open  ssh
80/tcp  open  http
139/tcp open  netbios-ssn
445/tcp open  microsoft-ds
#######
nmap -sP 192.168.1.0/24 # devices
    

netstat

Check opened/closed ports

netstat -tulnp
    

dig

To query DNS record types.

dig google.com ANY
    

telnet

telnet 127.0.0.1 7000
Type GET

    

Keywords

Load balancer, Proxy, Reverse Proxy,

References

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1. Configuring nginx as a reverse proxy for web application
2. What is the loopback device and how do I use it?
3. Wiki -- Direct memory access (DMA)
4. Firewall/Portforwarding/Loopback
5. ARCHIVED: What is the difference between a LAN, a MAN, and a WAN?
6. Wiki -- Network address translation
7. Using telnet to Test Open Ports
8. Configuring dynamic NAT in Cisco devices
9. Tutorial: Setting Up NGINX and NGINX Plus as a Web Server and Reverse Proxy in AWS