Practical network engineering
Learn Cisco, BGP and network security the way it works in production.
Step-by-step guides, labs and troubleshooting notes for CCNA, CCNP, routing, firewalls and automation. Written for engineers who want to understand the why, not just paste commands.
Latest guides
Stream of Knowledge
BGP
November 06, 2026
1. Opening IPv6 BGP is not a separate routing protocol; it uses MP-BGP to carry IPv6 unicast NLRI. The operational trap is assuming that be...
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Stream of Knowledge
BGP
November 05, 2026
1. Opening Day 8 introduced AFI/SAFI as vocabulary. This day goes deeper into the actual MP-BGP machinery. The key attributes are MP_REACH_...
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Stream of Knowledge
BGP
November 03, 2026
1. Opening A secure Internet edge is not one feature. It is a sequence of mutually reinforcing controls: explicit import/export policy, cus...
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Stream of Knowledge
BGP
November 03, 2026
1. Opening A sudden path change can look like a hijack even when the real problem is a customer's accidental transit leak, a stale ROA,...
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Stream of Knowledge
BGP
November 02, 2026
1. Opening During a volumetric attack, preserving the rest of the network can require intentionally discarding traffic to the attacked dest...
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