# ARP (Address Resolution Protocol) Spoofing

## ARP (Address Resolution Protocol) Spoofing <a href="#arp-address-resolution-protocol-spoofing" id="arp-address-resolution-protocol-spoofing"></a>

ARP is used to find another computer’s MAC address based on its IP address.

### Basic Flow <a href="#basic-flow" id="basic-flow"></a>

1. **Check Interface and Gateway IP Address**

   ```shellscript
   # Interfaces
   ip addr

   # Default gateway
   ip route list
   ```
2. **Scan the Network to Find Target IP**

   ```shellscript
   nmap -sP <gateway-ip>/24
   nmap -sP <gateway-ip>/16
   ```
3. **Enable IP Forwarding**

   ```shellscript
   # Allow all forwading in the LAN
   # -A: append rules
   # -i: interface
   # -j: jump
   iptables -A FORWARD -i eth0 -j ACCEPT
   ```

### Find MAC Address <a href="#find-mac-address" id="find-mac-address"></a>

```shellscript
cat /sys/class/net/eth0/address
cat /sys/class/net/enp0s3/address
cat /sys/class/net/tun0/address
```