Simplicity is the ultimate sophistication

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The Linux Kernel map

I have recently started to develop an interest for virtual networking as this is becoming an important step in a “Cloud” incarnation. Here is just a link for now


I am currently studying the Open vSwitch architecure and features. Next I will continue with a short look at VMware vSwitch and Nexus 1000. The final leg of this virtual trip will be the “virtual appliances” from vendors like F5, Alteon, Checkpoint and so on.

Free AAA: Tacacs+ vs Radius

Here is a short article that will help and guide you in case you have to select one of these two protocols for controlling the access to your devices. The first thing you have to bear in mind is that while Tacacs is a propietary protocol (Cisco) Radius is an open standard protocol and it is natively supported by many applications and network devices. Plese see below a comparision table between the two protocols:

A quick look at traffic generators

Due to a change in priorities for the client I am working with I will have to postpone studying BGP (actually resuming this) and to start learning QoS and to add some Voice to my skills. This is a great opportunity and I am very happy that I can learn this.
Any serious QoS learning will involve testing and I don't think that you can seriously do that without using a traffic generator. So here is the list with traffic generators that I am currently evaluating and my opinions about each of them:
  1. TTCP
  2. IxChariot
  3. JPerf/Iperf
  4. Pagent
  5. Packet Builder
  6. Scapy
  7. Ostinato
  8. Mtools
  9. MGEN
  10. Rude/Crude
  11. UDPgen
  12. UDP Generator
  13. Network Traffic Generator
  14. MxTraf
  15. NTGen
  16. Netperf
  17. Traffic Generator Tool
  18. TfGen
  19. Packet Shell
  20. Real-Time Voice Traffic Generator
  21. Self Similar Traffic Generator
  22. PacGen packet forger
  23. IPGen packet forger
  24. IP-Packet packet forger
  25. GenSyn
  26. Netspec Traffic emulator
  27. Surge Traffic emulator
  28. Poisson Traffic Generator
  29. FTP traffic generator
  30. Brawny and Rough Udp Traffic Engine
  31. Jugi's Traffic Generator (jtg)
  32. TrafGen
  33. SPAK, Packet Generator
  34. TTCP, Test TCP
  35. PIM-SM, Protocol Independent Multicast Packet Generator
  36. KUTE-- Kernel-based Traffic Engine
  37. GEIST - Generator of E-commerce and Internet server Traffic

Commercial Tools

LANdecoder32T Traffic Generator  
LANTraffic V2 and IP Traffic Test & Measure  
Traffic Generator for Wide Area Networks  
Candela Technologies LANforge-FIRE Network Traffic Generator Testing Specific Protocols  
ProvaGEN 3.0  
Internetworking Test Traffic Generation Programs  
Omnicor Hardware IP traffic generators    
Omnicor Software IP traffic generators  
Skaion's Traffic Generation System (TGS)  

CCDE study resources


Saving these here for later. Copied from ccdewiki.wordpress.com

Cisco Official Materials
Interviews and insights from networkers
Study Groups
Preparation Tips from those who passed the exam:
Highly Recommended Books:

Read the following books at lease twice, make sure you understand all the concepts, especially protocols features and design options. Go through all the case studies thoroughly.

Recommended Books:

Read the following books at lease once.

Online Resources
Published: 25 June 2016