IP Corner Articles Announcements

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Designing Site-to-Site IPsec VPNs - Part 5	04/01/2009
Boštjan Šuštar explains GET VPNs and their predecessor, the Tunnel Endpoint Discovery (TED).
Add a VPN to an Enterprise Network with Multi-VRF Functionality	03/31/2009
Ivan Pepelnjak explains the implications of building VPNs with Multi-VRF feature.
Designing Site-to-Site IPsec VPNs - Part 4	02/05/2009
Boštjan Šuštar describes the Dynamic Multipoint VPNs (DMVPN).
Designing Site-to-Site IPsec VPNs - Part 3	12/18/2008
Boštjan Šuštar explains two implementation options of VTI – static and dynamic VTIs.
Improve the Convergence of Mission-Critical Networks with Bidirectional Forwarding Detection (BFD)	11/25/2008
Ivan Pepelnjak describes how BFD is used in detecting two-way communication with the next-hop router to provide sub-second network convergence.
Designing Site-to-Site IPsec VPNs - Part 2	10/14/2008
Boštjan Šuštar describes the point-to-point Generic Routing Encapsulation (GRE) tunnel over IPsec.
Secure Time Management	09/01/2008
Ivan Pepelnjak describes how to protect NTP server running on the routers against intruders.
Designing Site-to-Site IPsec VPNs	08/01/2008
Boštjan Šuštar describes how to design a network solution for site-to-site VPNs by using IPsec to provide virtualization and strong security.
The OSPF Default Mysteries	07/01/2008
Ivan Pepelnjak describes various OSPF-generated default routes and their interaction in typical networks scenarios.
Servers in Small Site Multi-Homing	06/01/2008
Ivan Pepelnjak describes how to deploy publicly accessible servers on a multihomed small side.
Scalable Policy Routing	05/01/2008
Ivan Pepelnjak describes how the routing protocol-based policy routing can be implemented with BGP.

Archive Archive

It's Good to be on Time	04/01/2008
Ivan Pepelnjak describes how to use Network Time Protocol (NTP) on Cisco IOS devices to synchronize with a reliable time source.
Designing Fast Converging BGP Networks	03/01/2008
Ivan Pepelnjak describes how you can optimize BGP convergence in your network without overloading the routers running BGP.
When OSPF becomes a Distance Vector Protocol	02/01/2008
Ivan Pepelnjak illustrates how OSPF in multi-area setup shows distance vector behaviour which can affect the network convergence. He also describes mechanisms that alleviate the undesired side effects of OSPF.
The Never-Ending Story of IP Fragmentation	01/01/2008
Ivan Pepelnjak describes Path MTU Discovery and various mechanisms that can be used on Cisco routers to alleviate the IP fragmentation-related problems.
Bring your Network Closer to Five Nines with Graceful Shutdown	12/01/2007
Ivan Pepelnjak describes how the stub router advertisement functionality built into the OSPF routing protocol can be used to implement graceful shutdown and reduce the network downtime.
Load Balancing in BGP Networks	11/01/2007
Ivan Pepelnjak describes how to achieve a surprisingly good load balancing even when you use BGP as one of your core routing protocols.
Changing the Routing Protocol in Your Network	10/01/2007
Ivan Pepelnjak describes the potential scenario that would help you change the routing protocol in your network.
Increase the Stability of your Network	09/01/2007
Ivan Pepelnjak describes how the IP Event Dampening can be used to reduce the impact of interface flaps on the stability of your network.
Redundant Small Site Multi-Homing	07/01/2007
Ivan Pepelnjak describes how to extend the small site multi-homing design with a set of redundant routers.
Cisco Router: the Swiss Army Knife of Network Services	06/01/2007
Ivan Pepelnjak describes how to use a Cisco router as a local DNS server.
Enhance the IOS User Interface	05/01/2007
Ivan Pepelnjak describes how to use simple filters provided by the Cisco IOS to tailor the amount of information generated by the "show" commands.
Scaling EIGRP Networks with Stub Routers	04/01/2007
Ivan Pepelnjak describes the stub routers feature of the Enhanced Interior Gateway Routing Protocol (EIGRP).
Replacing Configuration on a Working Router	03/01/2007
Ivan Pepelnjak describes how to use the Cisco IOS Configuration Replacement and Configuration Rollback feature to replace the current running configuration with any saved Cisco IOS configuration file.
Small Site Multi-Homing	02/01/2007
Ivan Pepelnjak describes how to implement the Small Site Multi-Homing with existing Cisco technologies in the existing ISP environment.
Keep Track of Router Configurations with Configuration Archive	01/01/2007
Ivan Pepelnjak describes how to prepare for the unexpected network-downtime with the Configuration Archive feature of Cisco IOS and how to extend it with Embedded Event Manager.
Router Configuration Management … Too Good to be True?	12/01/2006
Ivan Pepelnjak tests the new configuration management tools of Cisco IOS.
Perfect load-balancing: How close can you get?	11/01/2006
Ivan Pepelnjak shows you how you can deploy MPLS Traffic Engineering (MPLS-TE) in your enterprise network to achieve optimal load-balancing in a highly redundant setup.
Using a web server to manage your router configurations	10/01/2006
Ivan Pepelnjak describes the required configuration steps for both the Cisco routers and the web server on which you want to store the router configurations.

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