From the website: "IP Source Guard is a security feature on Cisco switches designed to prevent IP address spoofing attacks. It restricts IP traffic on untrusted switch ports by filtering traffic based on the DHCP snooping binding database or manually configured IP-to-MAC bindings."
In January 2026, Internetworks published several networking tutorials focused on advanced IPv6 and routing topics. The January 15 post explains IPv6 route redistribution between different routing protocols like EIGRPv6, OSPFv3, and RIPng, highlighting how to configure redistribution so routes can be exchanged between these protocols in an IPv6 environment. It emphasizes planning to avoid routing loops and using filtering, metrics, and administrative distance adjustments to control the redistributed routes, and includes an example configuration with multiple routers running EIGRPv6, OSPFv3, and RIPng working together.
Earlier in the month, January 12 featured a tutorial on IPv6 EIGRP, detailing the next-generation implementation of Cisco’s Enhanced Interior Gateway Routing Protocol for IPv6. This explained its advantages—such as rapid convergence and separate protocol instances for IPv6—and showed how to enable IPv6 EIGRP on interfaces with addressing and configuration examples. January 4 covered Cisco IP Source Guard, a security feature that prevents IP spoofing on switches by filtering traffic based on DHCP snooping or static IP-to-MAC bindings, along with step-by-step setup instructions.
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