Author Archives: rootuser

Junos Routing-Instance, RIB-Groups, imports, and Logical Tunnel Interfaces explained.

This post will explain the wonders of routing-instances within Junos. (comparable to “vrf-ligth” with some other Vendors..) It wil also cover shady areas like RIB-groups, “import instance-from” and finally, Logical Tunnel – Interfaces. The examples should work.. although I had … Continue reading

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IPv6 and Neighbor Discovery de-mistified..

ipv6-and-neighbor-discovery-explained

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Configuring an VMPS server with FreeRadius

Note: this setup is probably the WORST documented peace of Open Source software I have come across and all forums times I have found on it are of people struggling with it. So here goes.. “how do I use Freeradius as … Continue reading

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To configure a freeradius server for a cisco switch with DOT1X

0. First make you have a working FreeRadius server running and all is jolly. For details, see my previous post “To configure a freeradius server for a cisco switch”. 1. On the FreeRadius server, add a Dot1X Port-user in /etc/freeradius/users … Continue reading

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A simple overview of OSPF Area Types

For some reason or another.. I never came across a simple overview of the different OSPF areas. So I made one.. if you like it (or NOT!) feel free to respond. ospf-area-study

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Cisco IOS and Configuration Archiving

If you were under the impression that only Juniper has a nice revision system for archiving configurations… think again and behold a not very well known feature in IOS: configuration archiving…   archiving-notes

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TDR functionality within Cisco IOS high-end Switches

  This document introduces a nice features in IOS that is not very commonly know: a time domain reflectometer functionality on the SwitchPorts! tdr-example-cisco-3560-switch

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IPV6, Stateless Autoconfiguration and the M / O Flags

stateless-autoconfiguration-with-prefix-discovery

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A fresh look on Anycast Addressing..

explanation-anycast

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A case study of DHCP snooping and IP Source Guard

dhcp-snooping-and-ip-source-guard-study

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