BGP by Beijnum Iljitsch van

Author:Beijnum, Iljitsch van [Iljitsch van Beijnum]
Language: eng
Format: epub
Tags: COMPUTERS / Networking / Network Protocols
ISBN: 9781449390822
Publisher: O'Reilly Media
Published: 2010-03-04T16:00:00+00:00

Smurf directed broadcast amplification

“Smurf” attacks use misconfigured intermediate networks to multiply traffic, allowing attackers to easily muster up large amounts of traffic without the need to hack any systems. The attacker sends ICMP echo request packets with the source address set to that of the intended victim to a directed broadcast address of an amplifier network. The router at this network turns the packet into a broadcast, so all hosts connected to the subnet receive it. Many of these hosts will reply with an echo reply message, which will be sent to the apparent source of the echo request message. As a result, the network under attack will see large amounts of incoming ICMP echo reply messages from many different hosts. In this case, the source addresses are those of the amplifying network, not of the attacker. Some attackers use other amplification mechanisms, such as UDP echo packets or short DNS queries that generate large reply packets. These are less common.

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