Scapy

EtherLeak is an ICMP information disclosure class that resurfaces across vendors and decades — same root cause, different hardware. IP stacks that trust IP_Total_Length over actual frame length expose NIC DMA ring buffer contents via ICMP Echo. Combined with TTL=0, extraction runs at 1,800 bytes/second with zero IDS alerts, zero firewall logs. Covers full mechanism, threshold math, Suricata detection rules, and Scapy PoC.

Smurf amplification requires three weaknesses simultaneously: no uRPF allows IP source spoofing, directed broadcast forwarding delivers the packet to all VLAN hosts, hosts reply to broadcast ICMP Echo. RFC 2644 fixed router-level directed broadcast. L2 broadcast domains are unaffected — the packet never crosses a router. Enterprise wireless VLANs with 50-100 APs and controllers become 50-100x amplifiers. ICMP processing is pre-authentication: no credentials, no session. Two-machine verification: attacker sends spoofed src=victim to broadcast, victim captures unsolicited Echo Replies. pcap-level proof included.