internet_outage_survey_it30w-20091223 (12/23/2009 to 01/06/2010)

To collect this data, a subset of Internet IP address blocks were pinged by sending ICMP ECHO_REQUEST (PING) packet. The response (if it ever came within 11 minutes time interval) was recorded in this data set. Probe was repeated every 11 minutes. In all, approximately 20k /24 subnets were periodically reprobed. Outages are analyzed and reported on the responses.

为构建本数据集，研究人员通过发送ICMP回声请求（ICMP ECHO_REQUEST，即PING）数据包，对部分互联网IP地址块开展了PING探测操作。若探测响应能在11分钟的时间间隔内返回，则将该响应记录至本数据集。每11分钟重复执行一次探测任务。总计约20000个/24子网被周期性重复探测。研究人员将基于探测响应结果对网络中断情况进行分析并形成相关报告。