1. Best Practices and Considerations in Egress Filtering. https://insights.sei.cmu.edu/sei_blog/2018/04/best-practices-and-considerations-in-egress-filtering.html. Best Practices and Considerations in Egress Filtering. https://insights.sei.cmu.edu/sei_blog/2018/04/best-practices-and-considerations-in-egress-filtering.html.
2. CAIDA UCSD Real-time Network Telescope Data. Available via IMPACT dataset ID DS-0206. http://www.caida.org/data/passive/telescope-near-real-time_dataset.xml. CAIDA UCSD Real-time Network Telescope Data. Available via IMPACT dataset ID DS-0206. http://www.caida.org/data/passive/telescope-near-real-time_dataset.xml.
3. Netlab 360: Quick summary about the Port 8291 scan. https://blog.netlab.360.com/quick-summary-port-8291-scan-en/. Netlab 360: Quick summary about the Port 8291 scan. https://blog.netlab.360.com/quick-summary-port-8291-scan-en/.
4. SANS ISC InfoSec Forums: IPSEC / ISAKMP Vulnerability wrapup. https://isc.sans.edu/forums/diary/IPSEC+ISAKMP+Vulnerability+wrapup/852. SANS ISC InfoSec Forums: IPSEC / ISAKMP Vulnerability wrapup. https://isc.sans.edu/forums/diary/IPSEC+ISAKMP+Vulnerability+wrapup/852.
5. Why would a Windows machine scan for port 137? https://superuser.com/questions/1306406/why-would-a-windows-machine-scan-for-port-137. Why would a Windows machine scan for port 137? https://superuser.com/questions/1306406/why-would-a-windows-machine-scan-for-port-137.