arpspoof

arpspoof is a simple ARP spoofing tool that redirects packets between two hosts on a local network by forging ARP replies. It is the foundation for man-in-the-middle attacks on switched networks.

arpspoof works on networks where ARP spoofing is not mitigated. Modern switches with Dynamic ARP Inspection (DAI) and port security can detect and block ARP spoofing attacks.

arpspoof is a single-purpose tool for ARP spoofing only. Bettercap is a comprehensive framework that includes ARP spoofing along with DNS poisoning, WiFi attacks, BLE scanning, and many other features.

Yes, you must enable IP forwarding on your system to route intercepted traffic between the target and gateway. Use: sysctl -w net.ipv4.ip_forward=1.

ARP cache poisoning corrupts the target's ARP table by sending forged ARP replies, associating the attacker's MAC address with a legitimate host's IP. This redirects traffic through the attacker's system.

arpspoof can redirect encrypted traffic through your system, but it cannot decrypt TLS/SSL without additional techniques like SSL stripping. Combined with tools like mitmproxy, HTTPS interception is possible.

In a man-in-the-middle attack, arpspoof poisons both the target's and gateway's ARP caches, allowing the attacker to intercept, inspect, and forward traffic between both parties without their knowledge.

Use tools like arping to check for multiple MAC addresses on a single IP, monitor for duplicate IP alerts, or deploy ARP inspection on managed switches. Static ARP entries also prevent poisoning.

Enable Dynamic ARP Inspection (DAI) on switches, use 802.1X port authentication, implement static ARP entries for critical systems, and deploy intrusion detection systems that monitor ARP traffic.

Yes, arpspoof redirects traffic while tcpdump captures and analyzes it. Run arpspoof to establish the MITM position, then use tcpdump with BPF filters to inspect the intercepted packets.

Press Ctrl+C to stop arpspoof, then manually send correct ARP replies: arping -U -c 3 -I eth0 -s gateway_ip gateway_mac target_ip. Without restoration, hosts may continue sending traffic to the attacker's MAC.

arpspoof redirects all traffic, not specific ports. For port-specific redirection, combine with iptables rules: iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080 to redirect HTTP traffic to a local proxy.

Monitor for ARP table changes with arp-watch, use static ARP entries for critical systems, deploy IDS/IPS with ARP anomaly detection, and periodically scan with arping to verify IP-MAC consistency.

Yes, arpspoof works on WiFi networks when connected to the same subnet. Ensure your wireless adapter supports promiscuous mode and you're connected to the target WiFi network before launching attacks.

Run two arpspoof instances simultaneously: one poisoning the target (arpspoof -i eth0 -t target_ip gateway_ip) and one poisoning the gateway (arpspoof -i eth0 -t gateway_ip target_ip). This enables full bidirectional interception.

Yes, arpspoof works in VMs with bridged networking. Ensure the VM's virtual adapter is in bridged mode so it can send ARP packets on the physical network. NAT mode won't work for ARP spoofing.

Check the target's ARP table with 'arp -a' on the target machine to verify the gateway's MAC has changed to your MAC. On your machine, use tcpdump to verify you're receiving redirected traffic.

The -r flag enables reverse spoofing, poisoning both the target and the gateway simultaneously in a single command. This simplifies bidirectional interception without running two separate arpspoof instances.

arpspoof is part of the dsniff package. Install with: sudo apt install dsniff (Debian/Ubuntu) or sudo yum install dsniff (CentOS/RHEL). On macOS: brew install dsniff.