Blog Posts in 2011
December 2011
- That’s it for 2011 (23 Dec 2011)
- Which virtual networking technology should I use? (21 Dec 2011)
- Is NAT a Security Feature? (20 Dec 2011)
- Help me plan new webinars in 2012 (19 Dec 2011)
- Large-scale L2 DCI: a true story (16 Dec 2011)
- VXLAN, IP multicast, OpenFlow and control planes (15 Dec 2011)
- FCoE and LAG – industry-wide violation of FC-BB-5? (14 Dec 2011)
- IPv6 Multihoming Without NAT: the Problem (13 Dec 2011)
- Decouple virtual networking from the physical world (09 Dec 2011)
- DHCPv6 server on Cisco IOS: making progress (08 Dec 2011)
- We Just Might Need NAT66/NPT66 (and Not LISP) (06 Dec 2011)
- VM-aware Networking Improves IaaS Cloud Scalability (05 Dec 2011)
- Interesting links (2011-12-04) (04 Dec 2011)
- Junos Day One: MPLS Behind The Scenes (02 Dec 2011)
- VMware vSwitch – the baseline of simplicity (01 Dec 2011)
November 2011
- Junos Day One: IS-IS for dummies (30 Nov 2011)
- Virtual Switches – from Simple to Scalable (29 Nov 2011)
- Sending Wake-on-LAN (WOL) packet with IOS Tcl (28 Nov 2011)
- MacBook Air – mixed feelings (or is it just me) (25 Nov 2011)
- Multi-Level IS-IS in a Single Area? Think Again! (23 Nov 2011)
- Junos Interfaces and Protocols: Now I get it (22 Nov 2011)
- Log the source ports of HTTP sessions (21 Nov 2011)
- Interesting links (2011-11-20) (20 Nov 2011)
- Junos versus Cisco IOS: Explicit versus Implicit (18 Nov 2011)
- Nexus vPC and Consistency Checker (17 Nov 2011)
- Junos Versus Cisco IOS: MPLS and LDP (16 Nov 2011)
- OpenFlow: Enterprise Use Cases (15 Nov 2011)
- LDP-IGP Synchronization in MPLS Networks (14 Nov 2011)
- Welcome to ipSpace.net (12 Nov 2011)
- Juniper’s Virtual Gateway – a Virtual Firewall Done Right (10 Nov 2011)
- IPv6 Security: Getting Bored @ BRU Airport (09 Nov 2011)
- Junos Day One: Translating Configurations The Geeky Way (08 Nov 2011)
- Big Switch Networks might actually make sense (07 Nov 2011)
- Interesting links (2011-11-06) (06 Nov 2011)
- RFC Tidbit: IPv6 in 3GPP mobile networks (05 Nov 2011)
- Virtual switches need BPDU guard (04 Nov 2011)
- RFC Tidbit: IPv6 Flow Label (03 Nov 2011)
- OpenFlow Deployment Models (02 Nov 2011)
- Busting Layer-2 Data Center Interconnect Myths (01 Nov 2011)
October 2011
- L2 or L3 switching in campus networks? (31 Oct 2011)
- I Apologize, but I’m Excited (30 Oct 2011)
- Network Field Day 2 and OpenFlow Symposium (29 Oct 2011)
- ExpertExpress – just what you need for a tough MPLS/VPN RFP (28 Oct 2011)
- Generic VLAN Design (27 Oct 2011)
- QFabric Part 4 – Spanning Tree Protocol (25 Oct 2011)
- OpenFlow and the State Explosion (24 Oct 2011)
- Net Field Day, here I come (24 Oct 2011)
- Some more OpenFlow Q&A (20 Oct 2011)
- BGP and Route Maps (19 Oct 2011)
- What is Nicira really up to? (18 Oct 2011)
- IPv6 End User Authentication on Metro Ethernet (17 Oct 2011)
- Follow-the-Sun Workload Mobility? Get Lost! (14 Oct 2011)
- IPv6 Stateless Autoconfiguration 101 (13 Oct 2011)
- MPLS is not tunneling (12 Oct 2011)
- What Is OpenFlow (Part 2)? (11 Oct 2011)
- VXLAN termination on physical devices (10 Oct 2011)
- Interesting links (2011-10-09) (09 Oct 2011)
- Do I need IPv6 in my Enterprise (again) (07 Oct 2011)
- CloudSwitch – VLAN extension done right (06 Oct 2011)
- Reliable or Unreliable Cloud Services? (03 Oct 2011)
- EuroNOG 2011 – the nerdy heaven (02 Oct 2011)
September 2011
- Long-distance vMotion for Disaster Avoidance? Do the Math First (30 Sep 2011)
- DMVPN: Spoke QoS Challenge (29 Sep 2011)
- QFabric Part 3 – Forwarding (28 Sep 2011)
- VXLAN: awesome or braindead? (27 Sep 2011)
- ExpertExpress – Online Help When and Where You Need It Most (26 Sep 2011)
- QFabric Part 2 – Control Plane Overview (23 Sep 2011)
- Quick question: IP multicast over an existing IP backbone (22 Sep 2011)
- QFabric Part 1 – Hardware Architecture (20 Sep 2011)
- NVGRE – because one standard just wouldn’t be enough (19 Sep 2011)
- Interesting links (2011-09-18) (18 Sep 2011)
- Responsible Generation of BGP Default Route (16 Sep 2011)
- Changing configuration with EEM – yes or no? (15 Sep 2011)
- OSPF-over-DMVPN Using Two Hub Routers (14 Sep 2011)
- You Don’t Need OpenFlow to Solve Every Age-Old Problem (13 Sep 2011)
- Long-distance IRF Fabric: Works Best in PowerPoint (12 Sep 2011)
- Shut Down BGP Session Based on Tracked Object (09 Sep 2011)
- IPv6 MPLS/VPN (6VPE) with PPPoE and RADIUS (07 Sep 2011)
- Large-Scale Bridging = Nuked Earth (06 Sep 2011)
- Nexus 1000V LACP offload and the dangers of in-band control (05 Sep 2011)
- TRILL goes to WAN – the bridging craze continues (02 Sep 2011)
- VXLAN, OTV and LISP (01 Sep 2011)
August 2011
- VXLAN: MAC-over-IP-based vCloud networking (30 Aug 2011)
- FCoE networking elements classification (30 Aug 2011)
- BGP Next Hop Processing (29 Aug 2011)
- Interesting links (2011-08-28) (28 Aug 2011)
- DMVPN as a Backup for MPLS/VPN (25 Aug 2011)
- IBGP or EBGP in an enterprise network? (24 Aug 2011)
- BGP/IGP Network Design Principles (23 Aug 2011)
- Soft Switching Might not Scale, but We Need It (22 Aug 2011)
- Quotes of the week (19 Aug 2011)
- DMVPN Deployment Success Story (18 Aug 2011)
- VM-FEX – not as convoluted as it looks (17 Aug 2011)
- Source MAC address spoofing DoS attack (16 Aug 2011)
- The Road to Complex Designs Is Paved with Great Recipes (15 Aug 2011)
- Interesting links (2011-08-14) (14 Aug 2011)
- More OSPF-over-DMVPN Questions (12 Aug 2011)
- Stop reinventing the wheel and look around (10 Aug 2011)
- High Availability Fallacies (08 Aug 2011)
- Interesting links (2011-08-07) (07 Aug 2011)
- VLANs used by Nexus 1000V (05 Aug 2011)
- Imagine the Ruckus When the Hypervisor Vendors Wake Up (03 Aug 2011)
- Building a Greenfield Data Center (01 Aug 2011)
July 2011
- Penultimate Hop Popping (PHP) demystified (27 Jul 2011)
- Asymmetric MPLS MTU problem (25 Jul 2011)
- vSphere 5.0 new networking features: disappointing (22 Jul 2011)
- Disaster Recovery: Lessons Learned (20 Jul 2011)
- Disasters Happen ... It’s the Recovery that Matters (18 Jul 2011)
- Interesting links (2011-07-17) (17 Jul 2011)
- The MPLS MTU Challenges (15 Jul 2011)
- Is Fibre Channel Switching Bridging or Routing? (13 Jul 2011)
- Do we need distributed switching on Nexus 2000? (11 Jul 2011)
- Monitor multiple interfaces with a single EEM applet (08 Jul 2011)
- Hypervisors use promiscuous NIC mode – does it matter? (06 Jul 2011)
- All MTUs are not the same (04 Jul 2011)
- Moving to summer schedule (01 Jul 2011)
June 2011
- Multisite Clusters Done Right... by None Other than Microsoft (30 Jun 2011)
- Brocade ServerIron ADX – NAT64 done right (29 Jun 2011)
- 6-to-4 load balancing is not NAT64 (28 Jun 2011)
- The beauties of dense-mode FCoE (27 Jun 2011)
- Soft (hypervisor) switching links (26 Jun 2011)
- vCider: climbing the virtual networking mountain (22 Jun 2011)
- Some More QoS Basics (21 Jun 2011)
- Automatic edge VLAN provisioning with VM Tracer from Arista (20 Jun 2011)
- Test your VMware networking skills (17 Jun 2011)
- Blast from the past: ATM and POS interfaces (16 Jun 2011)
- FCoE over TRILL ... this time from Juniper (15 Jun 2011)
- QoS in Large-Scale DMVPN Networks (14 Jun 2011)
- Stretched Clusters: Almost as Good as Heptagonal Wheels (10 Jun 2011)
- Random MPLS/VPN Q&A (07 Jun 2011)
- VN-Tag/802.1Qbh basics (03 Jun 2011)
- Getting ready for World IPv6 Day ... in six days (02 Jun 2011)
- Speculation: This is how I would build QFabric (01 Jun 2011)
May 2011
- EVB (802.1Qbg) – the S component (31 May 2011)
- Building CsC-enabled MPLS backbone (30 May 2011)
- For the Record: I Am Not Against OpenFlow ... (27 May 2011)
- MPLS/VPN Transport Options (26 May 2011)
- Data Center Fabric Architectures update#1 (25 May 2011)
- Scalability of Common Services MPLS/VPN topology (24 May 2011)
- Interesting links (2011-05-22) (22 May 2011)
- IPv6 Neighbor Discovery exhaustion attack and IPv6 subnet sizes (20 May 2011)
- Router reload after 15 minutes of failed pings (19 May 2011)
- Scaling IaaS network infrastructure (17 May 2011)
- Ignoring STP? Be careful, be very careful (13 May 2011)
- FlexNetwork: the first impressions (12 May 2011)
- NAT64: it’s all about the legacy content (11 May 2011)
- OpenFlow Is Like IPv6 (10 May 2011)
- Complexity Belongs to the Network Edge (09 May 2011)
- Yearly subscription: too good to be true? (06 May 2011)
- Edge Virtual Bridging (EVB; 802.1Qbg) eases VLAN configuration pains (05 May 2011)
- OSPF and Connected Networks: To Redistribute or Not? (03 May 2011)
- NHRP Convergence Issues in Multi-Hub DMVPN Networks (02 May 2011)
- Interesting links (2011-05-01) (01 May 2011)
April 2011
- OpenFlow 1.1 in hardware: I was wrong (again) (29 Apr 2011)
- DMVPN Spoke NHRP Behavior Changed in IOS Release 15.0M (28 Apr 2011)
- New Data Center switches from Force10 (26 Apr 2011)
- Virtual network appliances: benefits and drawbacks (21 Apr 2011)
- Spoke-to-Spoke IP Multicast over DMVPN? (20 Apr 2011)
- OpenFlow FAQ: Will the Hype Ever Stop? (19 Apr 2011)
- Distributed Firewalls: a Ticking Bomb (18 Apr 2011)
- Interesting links (2011-04-17) (17 Apr 2011)
- OSPF Route Selection Rules (16 Apr 2011)
- VPLS versus OTV for L2 Data Center Interconnect (DCI) (15 Apr 2011)
- MPLS/VPN in Data Center Interconnect (DCI) Designs (14 Apr 2011)
- (v)Cloud Architects, ever heard of MPLS? (13 Apr 2011)
- vCloud Director Network Isolation (vCDNI) scalability (12 Apr 2011)
- OpenFlow: BIOS Does Not a Server Make (08 Apr 2011)
- DMVPN: How to Get from Zero to Hero? (07 Apr 2011)
- What is OpenFlow? (05 Apr 2011)
- Brocade VCS fabric has almost-perfect load balancing (04 Apr 2011)
- Interesting links (2011-04-03) (03 Apr 2011)
- Cisco and Brocade working together on interoperable TRILL products (01 Apr 2011)
March 2011
- Open Networking Foundation – Fabric Craziness Reaches New Heights (31 Mar 2011)
- NAT-PT is dead! Long live NAT-64! (29 Mar 2011)
- MPLS/VPN-over-GRE-over-IPSec: Does It Really Work? (28 Mar 2011)
- VRF-aware services in Cisco IOS (25 Mar 2011)
- TRILL/Fabric Path – STP Integration (24 Mar 2011)
- IPv6-Enabling Your Legacy Applications with F5 BIG-IP LTM (23 Mar 2011)
- Don’t Try to Fake Multi-chassis Link Aggregation (MLAG) (21 Mar 2011)
- IPv6 security issues: Fixing implementation problems (17 Mar 2011)
- You can't ignore IPv6 any longer (in seven steps) (16 Mar 2011)
- Does Bridge Assurance Make UDLD Obsolete? (15 Mar 2011)
- Get the right troubleshooting tools for the job (14 Mar 2011)
- Ensuring multi-tenant security in cloud services (11 Mar 2011)
- Framed-IPv6-Prefix used as delegated DHCPv6 prefix (10 Mar 2011)
- Delegated IPv6 prefixes – RADIUS configuration (08 Mar 2011)
- Internet morons are so amazing! (05 Mar 2011)
- Don’t lie about proprietary protocols (04 Mar 2011)
- The Data Center Fabric architectures (03 Mar 2011)
- DHCPv6-RADIUS integration: the Cisco way (02 Mar 2011)
- IPv6CP+DHCPv6+SLAAC+RA = IPCP (01 Mar 2011)
February 2011
- Traffic Trombone (what it is and how you get them) (28 Feb 2011)
- What exactly makes something “mission critical”? (25 Feb 2011)
- L2 DCI with MLAG over VPLS transport? (24 Feb 2011)
- Looking for vCDNI packet traces (23 Feb 2011)
- Yearly subscription now available without a webinar registration (22 Feb 2011)
- DHCPv6+SLAAC+RA = DHCPv4 (21 Feb 2011)
- How would you use VPLS transport in L2 DCI? (18 Feb 2011)
- VEPA or vCloud Network Isolation? (17 Feb 2011)
- FCoMPLS – attack of the zombies (16 Feb 2011)
- Why would FC/FCoE scale better than iSCSI? (15 Feb 2011)
- Load sharing in MPLS/VPN networks with route reflectors (14 Feb 2011)
- Doing more with less (13 Feb 2011)
- Local Area Mobility (LAM) – the true story (11 Feb 2011)
- Changing VPNv4 route attributes within the MPLS/VPN network (10 Feb 2011)
- Layer-3 gurus: asleep at the wheel (09 Feb 2011)
- How did we ever get into this switching mess? (08 Feb 2011)
- Changing IP precedence values in router-generated pings (07 Feb 2011)
- The week of blunders (05 Feb 2011)
- EEM QA: what were they (not) doing? (04 Feb 2011)
- End-to-End QoS marking in MPLS/VPN-over-DMVPN networks (02 Feb 2011)
- IPv6 Provider Independent Addresses (01 Feb 2011)
January 2011
- Open FCoE – Software implementation of the camel jetpack (31 Jan 2011)
- Interesting links (2010-01-30) (30 Jan 2011)
- Stop accidental scheduled router reloads (28 Jan 2011)
- VMware Cluster: Up and Running in Three Hours (27 Jan 2011)
- vSwitch in Multi-chassis Link Aggregation (MLAG) environment (26 Jan 2011)
- VMware vSwitch does not support LACP (25 Jan 2011)
- Intelligent Redundant Framework (IRF) – Stacking as Usual (24 Jan 2011)
- Interesting links (2011-01-23) (23 Jan 2011)
- VPN Network Design: Selecting the Technology (20 Jan 2011)
- Configuring OSPF in a Phase 2 DMVPN network (19 Jan 2011)
- DMVPN Phase 2 Fundamentals (18 Jan 2011)
- OSPF Configuration in Phase 1 DMVPN Network (17 Jan 2011)
- DMVPN Phase 1 Fundamentals (14 Jan 2011)
- Sometimes You Need to Step Back and Change Your Design (13 Jan 2011)
- MPLS/VPN over mGRE strikes again (12 Jan 2011)
- EEM event cli command options and the _exit_status variable (11 Jan 2011)
- Interesting links (2011-01-09) (09 Jan 2011)
- The Big Picture (08 Jan 2011)
- Using BGP in Phase 1 DMVPN network (07 Jan 2011)
- Campfire: the true story of MPLS (05 Jan 2011)
- Schedule reload before configuring the router (04 Jan 2011)
- Interesting links (2011-01-02) (02 Jan 2011)