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
October 23, 2026
1. Opening Traditional route-leak prevention relies on operators correctly encoding business relationships in policy. RFC 9234 adds a machi...
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Stream of Knowledge
BGP
October 22, 2026
1. Opening An eBGP session without an explicit import or export policy can become an accidental trust boundary. RFC 8212 changes that expec...
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Stream of Knowledge
BGP
October 22, 2026
1. Opening Route flap dampening was created to protect networks from unstable prefixes repeatedly appearing and disappearing. History showe...
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Stream of Knowledge
BGP
October 21, 2026
1. Opening Maximum-prefix is one of the simplest controls that can prevent a peer from overwhelming a routing table or accidentally sending...
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Stream of Knowledge
BGP
October 19, 2026
1. Opening BGP PIC changes the convergence problem from 'recalculate thousands of prefixes after failure' toward 'preinstall or...
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