Tagged: Routing
6 posts · browse all tags
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One Box, Many Firewalls: A Practical Guide to FortiGate VDOMs
Virtual domains let a single FortiGate behave as several independent firewalls — separate routing tables, policies, and administrative boundaries on shared hardware. When that's the right tool, when a VRF is the better one, and how inter-VDOM routing actually moves a packet between them.
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BGP Route Dampening Part 1: The Flapping Problem, Exponential Decay, and Cisco Configuration
A deep dive into how BGP route dampening works: the 1990s internet instability that created it, the exponential decay algorithm behind it, every Cisco parameter explained, and a full configuration and verification reference.
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BGP Route Dampening Part 2: RFC 7454, BFD, and Where Dampening Still Belongs
Why the IETF now discourages global BGP route dampening, how Bidirectional Forwarding Detection interacts with it, what RFC 7454 actually says, and the specific modern scenarios where dampening remains the right answer.
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A Day in the Life of a Packet on a 50G FortiGate, Part 3: Routing, Policy Routes, and SD-WAN Service Rules
The packet has a session entry and now needs to know where to go. FortiOS resolves that in a strict order: policy routes, then SD-WAN service rules, then the FIB. Each layer has its own logic, its own match criteria, and its own diagnostic surface.
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Comparing Route Tables Between Two Sources: A Small Python Tool for Audits and Migrations
A self-contained Python utility that takes two Excel route lists, normalises every prefix through ipaddress, finds exact matches and overlaps, preserves invalid entries for audit, and writes a colour-coded Excel report plus CSVs. Includes install guide and full source.
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NSE4 Part 9: Routing & SD-WAN
Part 9 of the NSE4 study series — static and policy routing, distance vs priority, RPF, OSPF and BGP basics, and how SD-WAN turns a pile of WAN links into a single steered zone with performance SLAs.