- Tunnels and virtual links:
- We can view a tunnel as
a "virtual (direct) link"
consisting of
multiple network hops
Fact:
- We can create a network using virtual links (tunnels) !!!
- We can view a tunnel as
a "virtual (direct) link"
consisting of
multiple network hops
- Overlay network:
- Overlay network:
- Overlay networks =
a network that is created by
using tunnels
on top of another network
Wikipedia: click here
- Overlay networks =
a network that is created by
using tunnels
on top of another network
- Overlay network:
- Fact:
- The overlay network technqiue is a powerful technique used to inplement novel services on top of the existing network
- Example:
(IPv6 and
Multicasting)
- Suppose networks 1 and 2
have implemented
a new network service
(such as IPv6):
- The new network service uses
its own packet format !!
These packets cannot be sent on the existing network:
- We can create a
tunnel between
nodes that
support the
new network service:
- The new format packets
can now be
encapsulated inside
an IP packet and
sent
directly between
the networks:
- Suppose networks 1 and 2
have implemented
a new network service
(such as IPv6):