Packets DownRange
3 Mintue read timeJustin Wilson PacketsDownRange A common problem I run into when diagnosing route issues is traffic not going across the path it’s supposed to. An established BGP session only means the routers successfully exchanged routes. It says nothing about which route your router actually installed in the forwarding table. Let’s get into some … Read more
5 minute read time.Justin Wilson j2sw.com When you configure a BGP session, one of the first questions is what routes you actually want to receive. If you have ever filled out a questionnaire with Hurricane Electric or another transit provider, they ask you what “kind” of routes you want. In this article, I plan to … Read more
RFC 10005 defines a BGP extended community that lets a router attach link bandwidth information to a route. Another router can use that value when it spreads traffic across multiple BGP paths. RFC 10005 matters because links are not always of the same capacity. This RFC provides routers with a standard way to carry bandwidth … Read more
I originally posted this over on the FD-IX Bloghttps://blog.fd-ix.com/george-washington-the-delaware-and-direct-routes/ When George Washington crossed the Delaware River on Christmas night in 1776, the goal was simple. Reach the objective by the most effective path while avoiding unnecessary delays and giving the opposing force as little warning as possible. The crossing was risky, but it created a … Read more
The Alta Labs Route10 includes dynamic routing support through FRRouting (FRR). This article walks through a complete BGP configuration example using private ASNs, a test prefix advertisement, inbound community tagging, and route filtering. It also covers where to access the FRR shell within the Route10 interface and how to verify that the BGP session is operating correctly.
Many Internet service providers believe PeeringDB is just for networks in large data centers. That belief sticks around like an old patch cable at the bottom of a toolbox. The reality is simpler: every ISP should have a PeeringDB entry, even if you never set foot in a carrier hotel, IXP, or meet-me room. Your … Read more
The term BOGON refers to any IP address prefix that should not be routable on the public internet.
The following is a Template for creating a BGP session with both a v6 and a v4 peer in Mikrotik RouterOS v7. It costs $15 for Patreon subscribers or $20 for everyone else.
In this post, I will break down what OSPF point-to-point mode is, when to use it, and why it might be your best option.
In this post, I walk through some key quirks and common pitfalls you might encounter when configuring BGP on MikroTik RouterOS (v6 & v7), Cisco IOS, Juniper Junos, and Arista EOS.
ISP-specific training focuses on the unique challenges and technologies Internet Service Providers face. Unlike general networking or CompTIA-style certifications, this type of training zeroes in on real-world field scenarios
OSPF, or Open Shortest Path First. OSPF is one of the most commonly used interior gateway protocols (IGPs) in enterprise and service provider networks. It’s fast, scalable, and supports complex topologies. Many WISPs use OSPF in their networks as well as other Service Providers.