Danish telecom company TDC Group says DDoS attack can be blunted by configuration changes. The BlackNurse attack doesn’t rely on crushing volumes of traffic but a select stream of data packets that are computationally intensive for firewalls to process. In October, Spotify and Twitter users found it difficult to reach services, including Spotify. The attack is different than an ICMP flood, where an attacker tries to take down a server by sending many pings. In contrast, the attack is executed with ICMP Type 3 Code 3 packets, TCP Group says.”]
Source: https://www.careersinfosecurity.com/how-one-laptop-could-jam-enterprise-firewalls-a-9527