xviii Software Networks
processor has nothing to do, it almost stops, and then speeds up
depending on the workload received.
Mobility is also another argument in favor of adopting a new form
of network architecture. We can show that by 2020, 95% of devices
will be connected to the network by a wireless solution. Therefore, we
need to manage the mobility problem. Thus, the first order of business
is management of multi-homing – i.e. being able to connect to several
networks simultaneously. The word “multi-homing” stems from the
fact that the terminal receives several IP addresses, assigned by the
different connected networks. These multiple addresses are complex
to manage, and the task requires specific characteristics. Mobility also
involves managing simultaneous connections to several networks. On
the basis of certain criteria (to be determined), the packets can be
separated and sent via different networks. Thus, they need to be
re-ordered when they arrive at their destination, which can cause
numerous problems. Mobility also raises the issues of addressing and
identification. If we use the IP address, it can be interpreted in two
different ways: user identification enables us to determine who the
user is, but an address is also required, to show where that user is. The
difficulty lies in dealing with these two concepts simultaneously.
Thus, when a customer moves sufficiently far to go beyond the subnetwork with which he/she is registered, it is necessary to assign a
new IP address to the device. This is fairly complex from the point of
view of identification. One possible solution, as we can see, is to give
two IP addresses to the same user: one reflecting his/her identity and
the other the location.
Another revolution that is currently under way pertains to the
“Internet of Things” (IoT): billions of things will be connected within
the next few years. The prediction is that 50 billion will be connected
to the IoT by 2020. In other words, the number of connections will
likely increase tenfold in the space of only a few years. The “things”
belong to a variety of domains: 1) domestic, with household electrical
goods,
home
health
care,
home
management,
etc.;
2) medicine, with all sorts of sensors both on and in the body to
measure, analyze and perform actions; 3) business, with light level
sensors, temperature sensors, security sensors, etc. Numerous
www.it-ebooks.info
processor has nothing to do, it almost stops, and then speeds up
depending on the workload received.
Mobility is also another argument in favor of adopting a new form
of network architecture. We can show that by 2020, 95% of devices
will be connected to the network by a wireless solution. Therefore, we
need to manage the mobility problem. Thus, the first order of business
is management of multi-homing – i.e. being able to connect to several
networks simultaneously. The word “multi-homing” stems from the
fact that the terminal receives several IP addresses, assigned by the
different connected networks. These multiple addresses are complex
to manage, and the task requires specific characteristics. Mobility also
involves managing simultaneous connections to several networks. On
the basis of certain criteria (to be determined), the packets can be
separated and sent via different networks. Thus, they need to be
re-ordered when they arrive at their destination, which can cause
numerous problems. Mobility also raises the issues of addressing and
identification. If we use the IP address, it can be interpreted in two
different ways: user identification enables us to determine who the
user is, but an address is also required, to show where that user is. The
difficulty lies in dealing with these two concepts simultaneously.
Thus, when a customer moves sufficiently far to go beyond the subnetwork with which he/she is registered, it is necessary to assign a
new IP address to the device. This is fairly complex from the point of
view of identification. One possible solution, as we can see, is to give
two IP addresses to the same user: one reflecting his/her identity and
the other the location.
Another revolution that is currently under way pertains to the
“Internet of Things” (IoT): billions of things will be connected within
the next few years. The prediction is that 50 billion will be connected
to the IoT by 2020. In other words, the number of connections will
likely increase tenfold in the space of only a few years. The “things”
belong to a variety of domains: 1) domestic, with household electrical
goods,
home
health
care,
home
management,
etc.;
2) medicine, with all sorts of sensors both on and in the body to
measure, analyze and perform actions; 3) business, with light level
sensors, temperature sensors, security sensors, etc. Numerous
www.it-ebooks.info