Question

How is IP spoofing done?

Answer 1

IP Spoofing:
IP spoofing is the creation of IP Packets with a forged source of IP address. In Computer networking, it can be simply called as cloning ones identity and done for impersonating another computing system.

How its done:
Each IP packet contains both the sender and receiver IP addresses, By changing the sender Ip address in the packet, anyone can spoof the IP address, so that it is not easy to find the attacker.
Using Linux iptables, it is easy to change source IP of outgoing packets.
Take a look at the below image; Host A has the given IP address and for Host B IP address is spoofed and changed to Host A.

IP Address Spoofing Source IP : 172.15.1.6 Destination IP: 10.0.0.25 Source IP : 172.15.1.6 Destination IP: 10.0.0.25 Host A Source IP : 172.15.1.6 Destination IP: 10.0.0.25 Server Actual Source IP: 172.14.0.5 Spoofed Source IP : 172.15.1.6 Destination IP: 10.0.0.25 Host B