Routing
IP Infusion powering the world from behind the scenes
- Tony Mattke
- Industry & events
- 2 min read
Founded by Kunihiro Ishiguro and Yoshinari Yoshikawa the founders of GNU Zebra, came together to form IP Infusion back in 1999 as a commercial-grade, hardware-independent …
BGP Communities
- Tony Mattke
- Routing
- 4 min read
BGP Communities has to be one of my favorite features added to the BGP protocol. As you should know by now, BGP passes several attributes between peers that help influence the BGP …
IP Multicast Routing Concepts
- Tony Mattke
- Routing
- 6 min read
Can you imagine a video conference taking place on a primarily T1 based WAN? Multiple copies of the same video stream being unicast from the host to each participant. Multiple …
BGP Essentials – The Art of Path Manipulation
- Tony Mattke
- Routing
- 4 min read
Most enterprise networks use BGP to peer with their Internet Service Providers if they want to be multi-homed. Many factors come into play when determining how traffic should flow, …
Bidirectional Forwarding Detection
- Tony Mattke
- Routing
- 6 min read
Bidirectional Forwarding Detection (BFD) is a UDP-based protocol that provides fast (very fast!) routing protocol independent detection of layer-3 next hop failures. BFD can be …
More BGP tricks
- Tony Mattke
- Routing
- 2 min read
At times, the ‘rules of BGP’ don’t fit the needs of our productions networks. When we get into today’s production networks how often do book configurations apply? I’ll tell you one …
Policy Based Routing
- Tony Mattke
- Routing
- 3 min read
Policy based routing is the process of altering a packets path based on criteria other than the destination address, commonly referred to as ‘policy routing’. PBR (Policy …
Using /31 subnets for point-to-point interfaces
- Tony Mattke
- Routing
- 2 min read
Recently a “colleague”, I use that term very loosely here, was reviewing my recommendations for changes on his network. Since they’re rather tight on public IP space, and require …
Route Selection
- Tony Mattke
- Routing
- 7 min read
One of the most common questions I get concerns path selection within the router. Everyone knows (or at least they should know) that a more specific prefix will be preferred, but …
BGP Security Tips (updated)
- Tony Mattke
- Routing
- 2 min read
For some, BGP is a rather large obtrusive beast of a protocol that scares them half to death. This is not without good reason as BGP is not only the most important protocol running …
Layer 2 Ethernet transport over OpenVPN
- Tony Mattke
- Routing
- 1 min read
One of the things I used to deploy frequently at my previous position was transport for other ISPs and businesses. Since MPLS support is in its infancy on the Imagestream platform, …
Using OSPF to create unlicensed full duplex connections.
- Tony Mattke
- Routing
- 4 min read
Recently one of my clients asked me to help resolve an issue at an aggregation point on their network. They had several connections that converged onto a single unlicensed link on …
How does latency effect throughput?
- Tony Mattke
- Routing
- 2 min read
One of the questions I get asked several times a week by my clients is as such. While most people never associate latency with the amount of data they can send across a single TCP …