GRE Tunnels
GRE tunnels are by far most common tunnelling technology. Very easy to setup, troubleshoot and operate. But in large scale deployment, configuring GRE tunnels become cumbersome, because GRE tunnel is a point to point tunnel.
Should I use Cisco OTV for the Datacenter Interconnect ?
Should I use Cisco OTV for the Datacenter Interconnect? This question comes from not only from my students but also the companies which I provide consultancy.
I will not go through the OTV details, how it works, design recommendations etc. But let me remind you what is OTV and why OTV is used , Where it makes sense very briefly. Read more
Introduction to VPN (Virtual Private Network)
Introduction to VPN (Virtual Private Network)
Let’s start with the definition. VPN is a logical network and created over shared physical infrastructure.
Shared infrastructure can be private such as MPLS VPN of a Service Provider or over the Public infrastructure such as Internet.
There are many concepts to understand VPN in detail but in this article I will cover the definition, common design considerations, and some not well known concepts about it.
We can group VPNs into two categories. WAN and the Datacenter VPN Technologies.
WAN VPN Technologies
1.GRE
2.mGRE (Multipoint GRE)
3. IPSEC
4. DMVPN
5.GETVPN
6.L2TPV3
7.LISP
8. MPLS L3 VPN Read more