Clear thinking for complex network decisions.

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VoIP

How to identify failure domains in a multi-site VoIP cluster

Why separating SIP signalling, media, databases and carriers matters when building a platform intended to survive site failure.

BGP security

The BGP filters every small ISP should test before production

A practical checklist covering inbound acceptance, outbound safeguards, RPKI, maximum prefix limits and customer announcements.

High availability

Designing a resilient MikroTik edge without creating hidden dependencies

VRRP alone does not create resilience. The routing, uplinks, health checks and service dependencies must agree on which router should be active.