Hi I agree that PingOf Death prevention algorithm shall block too long pings possibly causing buffer overflow at 65536 bytes of payload But I don't understand why router blocks short pings - they are used commonly in the networking to minimize traffic in the network. I work for a telecommunication company producing networking equipment and this is the first time I observe such behavior in a router. Ping Of Death attack bases on buffer overflow and IP packet fragmentation, not on small Ping Request ICMP messages. Can you provide official Statement or Standard document which recommends blocking of short Ping Requests as a measure to prevent Ping Of Death attack? Greg