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Fiber Factoids, Part 1 – A primer on common fiber optic cable types
If you’ve been in the IT industry for any amount of time you are likely to have ran across fiber optic patch cables in use in various different installations. Typically, you will most often see fiber optic cables used for an uplink to an internet service provider, in between network devices between buildings in a … Continue reading Fiber Factoids, Part 1 – A primer on common fiber optic cable types
What is a null route and why do I need one?
Definition There are several names for a null route, such as a “bit bucket”, a “black hole”, or just a null0 route. They all refer to the same basic mechanism that points traffic to a virtual interface on a router. That in turn is used for managing unwanted traffic to prevent loops or entering routes … Continue reading What is a null route and why do I need one?
FIREPOWER DNS Sinkhole
Many admins inadvertently design a sinkhole by null routing unused ranges within their core in order to limit unnecessary traffic. Some may even advertise these ranges from a Linux server running zebra or quagga for advanced alerting while monitoring for the propagation of worms or enumeration scans. In this post, we will discuss a similar … Continue reading FIREPOWER DNS Sinkhole
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