McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 27 Mobile IP.
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Transcript of McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Chapter 27 Mobile IP.
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Chapter 27
MobileIP
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
CONTENTSCONTENTS
• ADDRESSING• AGENTS• THREE PHASES• AGENT DISCOVERY• REGISTRATION• DATA TRANSFER• INEFFICIENCY IN MOBILE IP
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
ADDRESSINGADDRESSING
27.127.1
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
The IP addresses are designed The IP addresses are designed to work with stationary to work with stationary
hosts because part of the address hosts because part of the address defines the network to defines the network to
which the host is attached.which the host is attached.
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Figure 27-1
Host address and care-of address
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Mobile IP has two addresses Mobile IP has two addresses for a mobile host: for a mobile host:
one home address and one care-of address. one home address and one care-of address. The home address is permanent; The home address is permanent;
the care-of address changes as the mobile the care-of address changes as the mobile host moves from one network to another.host moves from one network to another.
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
AGENTSAGENTS
27.227.2
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Figure 27-2
Home agent and foreign agent
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
When the mobile host and the foreign agent are the same,
the care-of address is called a co-located
care-of address.
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
THREE PHASESTHREE PHASES
27.327.3
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Figure 27-3
Remote host and mobile host communication
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
AGENT DISCOVERYAGENT DISCOVERY
27.427.4
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Figure 27-4
Agent advertisement
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Mobile IP does not use a new packet Mobile IP does not use a new packet type for agent advertisement; type for agent advertisement;
it uses the router it uses the router advertisement packet of ICMP, advertisement packet of ICMP,
and appends an agent and appends an agent advertisement message. advertisement message.
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Mobile IP does not use a new packet Mobile IP does not use a new packet type for agent solicitation;type for agent solicitation;
it uses the router solicitation it uses the router solicitation packet of ICMP.packet of ICMP.
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
REGISTRATION
27.527.5
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Figure 27-5
Registration request and reply
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Figure 27-6
Registration request format
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Figure 27-7
Registration reply format
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
A registration request or reply A registration request or reply is sent by is sent by
UDP using the UDP using the well-known port 434.well-known port 434.
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
DATA TRANSFER
27.627.6
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Figure 27-8
Data transfer
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
The movement of the The movement of the mobile host is transparent mobile host is transparent to the rest of the Internet.to the rest of the Internet.
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
INEFFICIENCYIN
MOBILE IP
27.727.7
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Figure 27-9
Double crossing
McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000
Figure 27-10
Triangle routing
