Quality of Service For Mobile IP

Presented by - Katam Karan - MOHANAD - JACOB

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.

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

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

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)

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

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

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.

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).

Differentiated Services

Thank you.