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Posts by Rachel Kartch

Best Practices and Considerations in Egress Filtering

Best Practices and Considerations in Egress Filtering

• Blog
Rachel Kartch

When considering best practices in egress filtering, it is important to remember that egress filtering is not focused on protecting your network, but rather on protecting other organizations' networks. For example, the May 2017 Wannacry Ransomware attack is believed to have exploited an exposed vulnerability in the server message block (SMB) protocol and was rapidly spread via communications over port 445. Egress and ingress filtering of port 445 would have helped limit the spread of...

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Best Practices for Network Border Protection

Best Practices for Network Border Protection

• Blog
Rachel Kartch

When it comes to network traffic, it's important to establish a filtering process that identifies and blocks potential cyberattacks, such as worms spreading ransomware and intruders exploiting vulnerabilities, while permitting the flow of legitimate traffic. In this post, the latest in a series on best practices for network security, I explore best practices for network border protection at the Internet router and firewall....

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Distributed Denial of Service Attacks: Four Best Practices for Prevention and Response

Distributed Denial of Service Attacks: Four Best Practices for Prevention and Response

• Blog
Rachel Kartch

Late last month, Internet users across the eastern seaboard of the United States had trouble accessing popular websites, such as Reddit, Netflix, and the New York Times. As reported in Wired Magazine, the disruption was the result of multiple distributed denial of service (DDoS) attacks against a single organization: Dyn, a New Hampshire-based Internet infrastructure company. DDoS attacks can be extremely disruptive, and they are on the rise. The Verisign Distributed Denial of Service Trends...

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Rachel Kartch

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