Blog Posts in 2014

December 2014

• MPLS Tech Talks: RSVP-TE 101 (18 Dec 2014)
• VRF Lite on Nexus 5600 (17 Dec 2014)
• Just Published: Scaling Overlay Virtual Networking Videos (16 Dec 2014)
• L2VPN over IPv6 with Snabb Switch on Software Gone Wild (12 Dec 2014)
• Facebook Next-Generation Fabric (11 Dec 2014)
• Performance Tests and Out-of-Box Performance (10 Dec 2014)
• Last Call: Overlay Virtual Networks in Software Defined Data Centers (09 Dec 2014)
• Just published: Enterprise IPv6 videos (09 Dec 2014)
• Load Balancing in Google Network (08 Dec 2014)
• Scaling Distributed Systems Is Hard (06 Dec 2014)
• Hotel California Effects of Public Clouds (05 Dec 2014)
• Should I Really Program My Network? (03 Dec 2014)
• MPLS P-Router, Router or Layer-3 Switch? (02 Dec 2014)

November 2014

• Can You AS-Prepend a Single Host Route? (28 Nov 2014)
• Thanks for being there! (27 Nov 2014)
• Transactional Thoughts on a Stormy Night (26 Nov 2014)
• FECs, LDP, and BGP in the MPLS World (25 Nov 2014)
• Quick Peek: Juniper vMX Router (24 Nov 2014)
• Moving Workloads to the Clouds (22 Nov 2014)
• Open vSwitch Performance Revisited (21 Nov 2014)
• Network Programmability Phase 2: the Provisioned Network (20 Nov 2014)
• Coping with Byzantine Routing Failures (19 Nov 2014)
• Do We Have Too Many Knobs? (18 Nov 2014)
• Just Published: Overlay Virtual Networks in Software Defined Data Centers (17 Nov 2014)
• Reinventing the wheel (or RFC 1925 sect 2.11) (15 Nov 2014)
• Viptela SEN: Hybrid WAN Connectivity with an SDN Twist (14 Nov 2014)
• Just Published: VXLAN 2.0 Videos (13 Nov 2014)
• Scaling the Cloud Security Groups (12 Nov 2014)
• Handling the Bottom of MPLS Stack (10 Nov 2014)
• Response: Midokura Open-Sources MidoNet (08 Nov 2014)
• FlipIT Cloud: Orchestrating IT-as-a-Service on Software Gone Wild (07 Nov 2014)
• So You’re an Open Source Shop? Really? (06 Nov 2014)
• Does a Cloud Orchestration System Need an Underlying SDN Controller? (04 Nov 2014)
• Use a Disaster Recovery Project to Build Your New Cloud (03 Nov 2014)

October 2014

• Make Rip-and-Replace a bit less Creepy (31 Oct 2014)
• Overlay-to-Underlay Network Interactions: Document Your Hidden Assumptions (30 Oct 2014)
• Bad Ideas and Abominations (29 Oct 2014)
• Cumulus Linux in Real Life on Software Gone Wild (27 Oct 2014)
• MPLS 101: Introduction to Label Distribution Protocol (LDP) (24 Oct 2014)
• IPv6 in a Global Company – a Real-World Example (23 Oct 2014)
• All You Need Are Two Top-of-Rack Switches (22 Oct 2014)
• Network Programmability Phase 1: the Configured Network (21 Oct 2014)
• Micro-BFD: BFD over LAG (Port Channel) (20 Oct 2014)
• Just Published: Juniper Data Center Switches (19 Oct 2014)
• Workload Mobility and Reality: Bandwidth Constraints (17 Oct 2014)
• Border6 Non-Stop Internet: a Commercial BGP-Based SDN (16 Oct 2014)
• Networking Is Not as Special as We Think It Is (15 Oct 2014)
• Last Call: Free Version of SDN and OpenFlow – The Hype and the Harsh Reality (14 Oct 2014)
• Packet Reordering and Service Providers (13 Oct 2014)
• How to Get into the Top N% (12 Oct 2014)
• VXLAN and OTV: The Saga Continues (09 Oct 2014)
• Data Center Design Case Studies on Amazon – Take 2 (08 Oct 2014)
• We Need Consistency more than Controllers (07 Oct 2014)
• LAG versus ECMP (06 Oct 2014)
• Interop New York: It Was Great Fun (05 Oct 2014)
• Network Automation Tools with Jason Edelman on Sofware Gone Wild (03 Oct 2014)
• Bufferbloat Killed my HTTP Session… or not? (02 Oct 2014)
• MPLS 101: MPLS Traffic Engineering (01 Oct 2014)

September 2014

• Replacing a Central Firewall (30 Sep 2014)
• Building a Small Cloud with UCS Mini (29 Sep 2014)
• It’s the Application Development, Stupid (28 Sep 2014)
• TCP Is a Stream Protocol (27 Sep 2014)
• Schprokits with Jeremy Schulman on Software Gone Wild (26 Sep 2014)
• Quick Guide to my Interop New York Sessions (25 Sep 2014)
• Network Programmability 101: The Problem (24 Sep 2014)
• Connecting Virtual Routers to the Outside World (23 Sep 2014)
• SDN Deployment Considerations (22 Sep 2014)
• Formal Announcement: Software Gone Wild Podcast (22 Sep 2014)
• Virtual Networking in CloudStack (19 Sep 2014)
• Dynamic FCoE – Sparse-Mode FCoE Strikes Again (18 Sep 2014)
• You’ve Been Doing the Same Thing for the Last 20 Years (17 Sep 2014)
• The Four Paths to SDN (16 Sep 2014)
• SIGS & Carrier’s Lunch DC Day: An Event Definitely worth Visiting (15 Sep 2014)
• Tech Talks: The Essence of MPLS (12 Sep 2014)
• Open-Source Hybrid Cloud Reference Architecture on Software Gone Wild (11 Sep 2014)
• IPv6 Neighbor Discovery (ND) and Multicast Listener Discovery (MLD) Challenges (10 Sep 2014)
• vMotion Enhancements in vSphere 6 (09 Sep 2014)
• Controller Cluster Is a Single Failure Domain (08 Sep 2014)
• Is Anyone Using DMVPN-over-IPv6? (07 Sep 2014)
• See You in Bern on September 9th (06 Sep 2014)
• Scalability Enhancements in Cisco Nexus 1000V (05 Sep 2014)
• Snabb Switch Deep Dive on Software Gone Wild (04 Sep 2014)
• Just Published: SDN and OpenFlow – The Hype and the Harsh Reality (03 Sep 2014)
• Network Infrastructure as Database (02 Sep 2014)

August 2014

• Is Data Center Trilogy Package the Right Fit to Understand Long Distance vMotion Challenges? (29 Aug 2014)
• Fate Sharing in IP Networks (28 Aug 2014)
• Toolsmith @ Netflix on Software Gone Wild (27 Aug 2014)
• VMware EVO:RAIL – One Stop Shopping for Your Private Cloud (26 Aug 2014)
• Interview: Reduce Costs and Gain Efficiencies with SDDC (25 Aug 2014)
• Finally: a Virtual Switch Supports BPDU Guard (24 Aug 2014)
• ipSpace.net Is on CloudFlare (and IPv6) (23 Aug 2014)
• Cloud Orchestration System Is an Ideal Controller Use Case (22 Aug 2014)
• The Impact of Data Gravity: a Campfire Story (21 Aug 2014)
• Pmacct: the Traffic Analysis Tool with Unpronounceable Name (20 Aug 2014)
• Revisited: Layer-2 DCI over VXLAN (19 Aug 2014)
• Do you really need to see all 512K Internet routes? (18 Aug 2014)
• Just Published: Brocade VCS Fabric Videos (15 Aug 2014)
• What Is a Valid BGP Route? (14 Aug 2014)
• MPLS Load Sharing – Data Plane Considerations (13 Aug 2014)
• Should I Go for CCIE or Some Other Certification? (11 Aug 2014)
• VXLAN Encapsulation in Juniper Contrail (08 Aug 2014)
• Load Sharing in MPLS Core (06 Aug 2014)
• STP and Expert Beginners (04 Aug 2014)
• Rate-Limit Console Logging (01 Aug 2014)

July 2014

• VMware vSwitch and 802.1p CoS Value (30 Jul 2014)
• Is STP Really Evil? (28 Jul 2014)
• Could You Replace MPLS/VPN with IPSec-over-Internet? (25 Jul 2014)
• Campfire story: Using the wrong tool for the job (23 Jul 2014)
• Layer-3 Switching over VXLAN Revisited (21 Jul 2014)
• Next Chapter in Data Center Design Case Studies (18 Jul 2014)
• Network Automation @ Spotify on Software Gone Wild (17 Jul 2014)
• There Is no Paradigm Shift – Good Applications Were Always Network-Aware (15 Jul 2014)
• How Big Will Your Cloud Be? (11 Jul 2014)
• The F-Script with John Herbert on Software Gone Wild (09 Jul 2014)
• The Virtual Design Master Is Starting Today (08 Jul 2014)
• Data Center Design Case Studies on Amazon Kindle (07 Jul 2014)
• The summer office is finally operational... (04 Jul 2014)
• Build a Cloud in Three Easy Steps (03 Jul 2014)
• Network Programmability with David Gee on Software Gone Wild (02 Jul 2014)
• What Is This API Thingy? (01 Jul 2014)

June 2014

• Mice, Elephants and Virtual Switches (30 Jun 2014)
• A Long Trip down the Memory Lane (29 Jun 2014)
• It works, but is it scalable? (28 Jun 2014)
• Virtual Routers 101 (27 Jun 2014)
• Infrastructure as Code Actually Makes Sense (26 Jun 2014)
• Snabb Switch and NFV on OpenStack in Software Gone Wild (25 Jun 2014)
• Unnumbered OSPF Interfaces in Quagga (and Cumulus) (24 Jun 2014)
• Why is IPv6 layer-2 security so complex (and how to fix it) (23 Jun 2014)
• Bikeshed painting (21 Jun 2014)
• To Get a Job Done Well, You Need Proper Training (19 Jun 2014)
• Just Out: Data Center Design Case Studies (18 Jun 2014)
• Updated: Metro Ethernet and Carrier Ethernet Encryption (18 Jun 2014)
• Trident 2 Chipset and Nexus 9500 (16 Jun 2014)
• Just Found Two Data Center / Virtualization Blogs (15 Jun 2014)
• Programming the Way I Remember It (14 Jun 2014)
• IP Addresses Considered Harmful (13 Jun 2014)
• Is OpenFlow the Best Tool for Overlay Virtual Networks? (12 Jun 2014)
• Will Network Engineers Become Programmers? (11 Jun 2014)
• Can We Just Throw More Bandwidth at a Problem? (10 Jun 2014)
• 30 Years of Yammering (09 Jun 2014)
• Virtual Networking Implementation Taxonomy (05 Jun 2014)
• FCoE and Nexus 1000v QoS (03 Jun 2014)
• Building Scalable Web Applications – Final Presentations (02 Jun 2014)

May 2014

• What Are Linux Containers? (30 May 2014)
• It’s OK to Let Developers Go @ Amazon Web Services, but Not at Home? You Must Be Kidding! (29 May 2014)
• How Line-rate Is Line-rate? (28 May 2014)
• Queuing Mechanisms in Modern Switches (27 May 2014)
• The best spam comment (so far) (26 May 2014)
• Data Center Protocols in HP Switches (26 May 2014)
• Benefits of SDN (or: SDN is like IPv6) (23 May 2014)
• How Do I Start My First Overlay Virtual Networking Project? (22 May 2014)
• vMotion and VXLAN (21 May 2014)
• All Operations Engineers Should Have Firefighting Training (20 May 2014)
• OpenFlow Support in Data Center Switches (19 May 2014)
• Load Balancing Across IP Subnets (16 May 2014)
• Whitebox Switching and Fermi Estimates (15 May 2014)
• Connecting Legacy Servers to Overlay Virtual Networks (14 May 2014)
• Optimizing OpenFlow Hardware Tables (13 May 2014)
• Is OpenFlow Useful? (12 May 2014)
• New ipSpace.net content feeds (and why I love Perl) (09 May 2014)
• Does Centralized Control Plane Make Sense? (08 May 2014)
• It Doesn’t Make Sense to Virtualize 80% of the Servers (07 May 2014)
• Marketing Grammar (06 May 2014)
• SDN, OpenFlow, NFV and SDDC: Hype and Reality (2-day Workshop) (05 May 2014)

April 2014

• Declarative and Procedural Programming (and How I Got It all Wrong) (30 Apr 2014)
• IPv6 Resources on ipSpace.net (29 Apr 2014)
• Security in Leaf-and-Spine Fabrics (25 Apr 2014)
• Why Exactly Would You Want a Nexus 7000 in There? (24 Apr 2014)
• Brocade Shipped VXLAN VTEP with NSX Controller Support (23 Apr 2014)
• Distributed DoS Mitigation with OpenFlow (18 Apr 2014)
• Puppet Is a Tool, DevOps Is a Lifestyle (16 Apr 2014)
• IS-IS in Avaya’s SPB Fabric: One Protocol to Bind Them All (15 Apr 2014)
• Troubleshooting Residential IPv6 Connectivity (14 Apr 2014)
• Network Function Virtualization (NFV) 101 (11 Apr 2014)
• Changes in IBGP Next Hop Processing Drastically Improve BGP-based DMVPN Designs (10 Apr 2014)
• Three Common Mistakes That Can Doom Your Private Cloud (09 Apr 2014)
• Should We Use Redundant Supervisors? (08 Apr 2014)
• Real Life BGP Route Origination and BGP Next Hop Intricacies (07 Apr 2014)
• Video: VMware NSX Architecture (04 Apr 2014)
• The Hierarchy of Isolation (03 Apr 2014)
• Security and SDN (02 Apr 2014)
• Quantum SDN (01 Apr 2014)

March 2014

• STP in Brocade VCS Fabric – an Interesting Solution after a Long Wait (31 Mar 2014)
• IPv6-Only Data Center Deployment (28 Mar 2014)
• What Happened to “Be Conservative in What You Do”? (27 Mar 2014)
• Facebook Is Close to Having an IPv6-only Data Center (25 Mar 2014)
• Thank you, Troopers! (24 Mar 2014)
• Real-life OpenFlow Deployments (21 Mar 2014)
• Cisco IOS Supports RFC 6106 (RDNSS) (20 Mar 2014)
• Per-packet Load Balancing Interferes with TCP Offload (19 Mar 2014)
• We’re All Brothers on Link-Local (18 Mar 2014)
• Scaling BGP-Based DMVPN Networks (17 Mar 2014)
• The Fundamental Problem of IT Industry (15 Mar 2014)
• Scale-Out Load Balancing with OpenFlow (14 Mar 2014)
• MPLS Requires Custom Silicon. Really? (13 Mar 2014)
• Can We Use IPv6 Router Advertisements for Fast Failover? (12 Mar 2014)
• The Fundamental Difference between Phase 2 and Phase 3 DMVPN (11 Mar 2014)
• Review of my TCP, HTTP and SPDY Deep Dive Course (09 Mar 2014)
• OpenFlow 101 Video (07 Mar 2014)
• SDN Workshop @ Troopers 2014 (06 Mar 2014)
• Whose Failure Domain Is It? (05 Mar 2014)
• Network Automation: Just Do It! (04 Mar 2014)
• iOS uses Multipath TCP – Does It Matter? (03 Mar 2014)

February 2014

• Service Insertion with OpenFlow (28 Feb 2014)
• CLI or API? Wait … Do You Really Have to Ask? (27 Feb 2014)
• This Is Not the Host Route You’re Looking For (26 Feb 2014)
• VMware NSX Firewall Errata and Updates (25 Feb 2014)
• iSCSI or FCoE – Flogging the Obsolete Dead Horse? (24 Feb 2014)
• What exactly is SDN (Video)? (21 Feb 2014)
• Comparison of IPv6-over-IPv4 Tunneling Techniques (20 Feb 2014)
• Going All Virtual with Virtual WAN Edge Routers (19 Feb 2014)
• Is CLI In My Way … or Is It Just a Symptom of a Bigger Problem? (18 Feb 2014)
• Flow-based Forwarding Doesn’t Work Well in Virtual Switches (17 Feb 2014)
• OpenFlow-Based Network Tapping and Tap Aggregation Networks (14 Feb 2014)
• Combine Physical and Virtual Appliances in a Private Cloud (13 Feb 2014)
• Upcoming Presentations and Conferences (12 Feb 2014)
• Keep Your Failure Domains Small (11 Feb 2014)
• First-hop Load Balancing in IPv6 (10 Feb 2014)
• Distributed In-Kernel Firewalls in VMware NSX (07 Feb 2014)
• Disasters and Recoveries, Part 2 (06 Feb 2014)
• Why Can't We Have Plug-and-Play Networking? (04 Feb 2014)
• Disasters and Recoveries, Part 1 (03 Feb 2014)
• Things you say actually mean stuff (01 Feb 2014)

January 2014

• Complex Routing in Hyper-V Network Virtualization (30 Jan 2014)
• VMware Virtual Network: Stuck Between the Past and the Future (29 Jan 2014)
• Post #2000 (28 Jan 2014)
• IPv6 reachability between ULA and GUA endpoints (26 Jan 2014)
• Automation Explained (25 Jan 2014)
• Network Monitoring with OpenFlow (24 Jan 2014)
• PA, PI or ULA IPv6 Address Space? It depends (22 Jan 2014)
• Control and Data Plane Separation – Three Years Later (21 Jan 2014)
• vSphere Does Not Need LAG Bandaids – the Network Might (20 Jan 2014)
• IPv6 pings and path MTU discovery (19 Jan 2014)
• Controller Implementation Choices Affecting OpenFlow Scalability (17 Jan 2014)
• What Exactly Is SDN (And Does It Make Sense)? (16 Jan 2014)
• Interfacing Overlay Virtual Networks with MPLS/VPN WAN (15 Jan 2014)
• Source IPv6 Address Selection Saves the Day (14 Jan 2014)
• How Did Software Defined Networking Start? (13 Jan 2014)
• VMware NSX Gateway Questions (10 Jan 2014)
• Does uRPF Make Sense in Internet Service Provider Networks? (09 Jan 2014)
• I Say ULA, You Hear NAT (08 Jan 2014)
• Is Open vSwitch Control Plane In-Band or Out-of-Band? (07 Jan 2014)
• IPv6 Deployment: Religion and Reality (06 Jan 2014)