Assume an attacker has compromised a number of broadband connected computers, to

Question

Assume an attacker has compromised a number of broadband connected
computers, to use as zombie systems for a distributed denial of
service(DDOS) arrack. If the ISP provides maximum uplink data rate of 768
kbps in ADSL, what is the maximum number of 128-byte ICMP echo
request(ping) packets a single zombie computer can send per second? How
many such zombie systems would the attacker need to flood a target server
connected in:

A Fast Ethernet
b. A gigabit Ethernet

please be detailed in showing work.

Explanation / Answer

For the given scenario:

128 byte message = 128 * 8 = 1024 bits

Uplink capacity of zombie = 768 kbps = 768,000 bits per second

768,000/1024 = 750 packets per second

For Fast Ethernet:

Speed = 100 Mbps

Each packet = 500 bytes = 4000 bits

1 Mbps = 1,000,000 bits per second

Hence, 100 Mbps = 25000 packets per second

No. of Zombies need:

25000/32 ~ 781 zombies required.

For Gigabit Ethernet:

Speed = 1000 Mbps

Each packet = 500 bytes = 4000 bits

1 Mbps = 1,000,000 bits per second

Hence, 1000 Mbps = 250000 packets per second

No. of Zombies need:

250000/32 ~ 7812 zombies required.

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