Listen to this Post
IP spoofing is a technique where attackers disguise the origin of network traffic by faking the source IP address. This allows them to trick systems, bypass filters, and launch attacks — all while hiding their true identity.
Here’s how it works step-by-step:
1. Creates a Custom Packet
The attacker builds a network packet manually or with a tool, customizing the data it contains.
2. Changes the Source IP
Instead of using their real IP, the attacker swaps it with a trusted or random one to fake the origin.
3. Sends the Spoofed Packet
The forged packet is sent to the target system, which has no reason to doubt the fake IP.
- Target Trusts It Came from a Legit Source
Without authentication, many systems will accept the packet at face value — assuming it’s safe.
5. Hides the Attacker’s Real Identity
Spoofed IPs make it difficult to trace or block the actual attacker.
6. Used in Major Cyber Attacks
IP spoofing is a common tool in DDoS, Man-in-the-Middle (MitM), and session hijacking attacks.
You Should Know:
Detecting & Preventing IP Spoofing
Linux Commands for IP Spoofing Detection
1. Check Suspicious Network Traffic
tcpdump -i eth0 'src net not your_network'
Filters traffic not originating from your network.
2. Monitor SYN Floods (Common in DDoS)
netstat -ant | grep SYN_RECV | wc -l
High counts may indicate spoofed SYN attacks.
3. Enable IP Spoofing Protection
echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
Enables reverse path filtering to block spoofed packets.
Windows Commands for IP Spoofing Prevention
1. Check Active Connections
netstat -ano | findstr ESTABLISHED
Identifies unexpected connections.
2. Enable Firewall Logging
netsh advfirewall set currentprofile logging filename C:\fw.log
Logs suspicious traffic for analysis.
3. Block Suspicious IP Ranges
New-NetFirewallRule -DisplayName "Block Spoofed IPs" -Direction Inbound -RemoteAddress 192.168.0.0/16 -Action Block
Network-Level Defenses
- BGP & uRPF (Unicast Reverse Path Forwarding) – Prevents route hijacking.
- Ingress/Egress Filtering – ISPs should drop spoofed packets.
Testing IP Spoofing (Ethical Hacking)
1. Using Scapy (Python)
from scapy.all import<br /> packet = IP(src="fake_ip", dst="target_ip")/ICMP() send(packet)
Sends a spoofed ICMP packet.
2. Hping3 for Stress Testing
hping3 -a spoofed_ip -S -p 80 target_ip --flood
Simulates a SYN flood attack.
What Undercode Say
IP spoofing remains a critical threat in cybersecurity, enabling attacks like DDoS, MitM, and credential theft. While defenses like packet filtering, firewalls, and BGP hardening help, attackers continuously evolve. Organizations must adopt strict network monitoring, implement Zero Trust architectures, and educate teams on anomaly detection.
Expected Output:
- Suspicious traffic logs
- Blocked spoofed packets
- Alerts on unauthorized IP sources
Prediction:
As IPv6 adoption grows, spoofing techniques may shift, requiring updated detection methods. AI-driven traffic analysis could become essential in identifying spoofed packets in real-time.
Relevant URLs:
IT/Security Reporter URL:
Reported By: Dharamveer Prasad – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
