1. Quality of Service
For Mobile IP

2. Presented by - Katam Karan - MOHANAD - JACOB

3. QoS Defined
The Ability of the network to provide better service to the users and obviate any hindering’s or problems caused.
Can handle traffic as per the priority in a meticulous manner.
It Allows to precisely specify which packets to be dropped in case of congestion.

4. The Need For QoS Here we have three primary reasons: Packet loss
Transmission Delays
Jitter

5. Challenges To Face
It is a challenge to provide required QoS because of the following conditions.
Varying network topologies
Having limited network resources
Unpredictable effective bandwidth
High error rate

6. APPROCHES AND SOLUTIONS
Firstly the “Best-effort”
End-to-end state re-establishment for “Integrated Services” (IntServ)
Only access link state re-establishment for “Differentiated Services” (DiffServ)

7. The Best-Effort Approach
Default on routers (FIFO)
To Absolutely “DO NOTHING”
Network will serve as per its ability
Used by the Internet Protocol to deliver packets among hosts
Disadvantages:
Here packets may be
Lost
Tampered
No guarantee of packet delivery

8. Integrated Services (IntServ)- RFC 1613
Here the RSVP protocol is used
Resource reservations are made ahead
Involves per-flow behavior
This is also called as “Hard QoS”
Must maintain per flow state information
Disadvantages:
Involves overhead
Scalability issues
Not a complete approach to QoS

9. Security Issues In IntServ
The RSVP uses hop-by-hop security architecture.
“INTEGRITY OBJECT” is included within the RSVP message.
Here the RSVP also includes Policy-Data object.
In current RSVP security scheme, a two-way peer authentication and key management procedures are missing.

10. Differentiated Services (DiffServ)
This is also referred as “Class of Service”
Involves (PHB)- Per-Hop behavior
The Ability to handle different classes of traffic in different ways
In this approach, traffic is
==> Classified
==> Conditioned ( Meter, Marker, Shaper/Dropper).

11. Differentiated Services

12. Thank you.