Mobile IP

1
Mobile IP

• ???????????????
• ??????
• ?????
• ?? ??

2
Mobile IP?????

• Internet????????(Mobility)????????????????
• ??
• ?????????????????
• ?????????IP??????????
• ????????????????

3
MobileIP?????RFC

• IP in IP Tunneling (RFC1853)
• IP Mobility Support (RFC2002)
• IP Encapslation within IP(RFC2003)
• Minimal Encapslation within IP(RFC2004)
• Applicability Statement for IP Mobility Support
  (RFC2005)

4
MobileIP?????RFC

• IP in IP Tunneling (RFC1853)
• IP Mobility Support (RFC2002)
• IP Encapslation within IP(RFC2003)
• Minimal Encapslation within IP(RFC2004)
• Applicability Statement for IP Mobility Support
  (RFC2005)

5
Mobile IP????

• Stanford (Linux)
• http//gunpowder.stanford.edu/mip
• CMU (FreeBSD)
• http//monarch.cs.cmu.edu/software.html
• Politehnica univ. of Bucharest (WindowsNT)
• http//mip-nt.aii.pub.ro/

6
??RFC???

• IP Mobility Support (RFC2002)
• ????????????
• ?????????????
• ??????????

7
??RFC???

• IP Encapslation within IP(RFC2003)
• Minimal Encapslation within IP(RFC2004)
• ? ????????????????????

8
RFC2002????????????(ForeignAgent???)
Home address
Mobile Node
Home Network
Foreign Network
9
RFC2002????????????(ForeignAgent???)
Home Network
Mobile Node
Foreign Network
10
RFC2002????????????(ForeignAgent???)
Home address
Home address
Home Network
Mobile Node
Foreign Network
11
RFC2002????????????(ForeignAgent???)

• ???????????
• ?????
• ?????IP???????
• ???????????

12
RFC2002????????????(ForeignAgent???)
Home address
Home Agent
Home address
Home Network
Mobile Node
Foreign Agent
Foreign Network
13

• Home Agent (HA)
• Mobile Node(MN)?????Home Network?????MN??????????
  MN????????????
• Foreign Agent (FA)
• Mobile Node(MN)????????Foreign
  Network?????MN??????HA?????MN?????????????

14
RFC2002????????????(ForeignAgent???)
Home address
Home Agent
Home address
Care-of address
Home Network
Mobile Node
Foreign Agent
Foreign Network
15
RFC2002????????????(ForeignAgent???)
Home address
Home Agent
Care-of address
Home address
Agent Advertisement
Home Network
Mobile Node
Foreign Agent
Foreign Network
16
RFC2002????????????(ForeignAgent???)
Home address
Home Agent
Care-of address
Home address
Registration Request
Data of UDP
Care-of address
Mobile Node
Home address
Foreign Agent
Foreign Network
17
RFC2002????????????(ForeignAgent???)
Home address
Care-of address
Home address
Home Agent
Care-of address
Home address
Registration Reply
Mobile Node
Foreign Agent
Foreign Network
18
RFC2002????????????(ForeignAgent???)
Home address
Care-of address
Correspondent Node
Home address
Home Agent
Care-of address
Home address
Mobile Node
Foreign Agent
Foreign Network
19
RFC2002????????????(ForeignAgent???) )
Home address
Care-of address
Correspondent Node
Home address
CN ? HomeAddr
Home Agent
Care-of address
Home address
Mobile Node
Foreign Agent
Foreign Network
20
RFC2002????????????(ForeignAgent???)
Home address
Care-of address
CN ? HomeAddr
Correspondent Node
Home address
Home Agent
Care-of address
Home address
Mobile Node
Foreign Agent
Foreign Network
21
RFC2002????????????(ForeignAgent???)
Home address
Care-of address
CN ? HomeAddr
Correspondent Node
????
(Proxy ARP,Gratuitous ARP)
Home address
Home Agent
Care-of address
Home address
Mobile Node
Foreign Agent
Foreign Network
22
RFC2002????????????(ForeignAgent???)
Home address
Care-of address
Correspondent Node
Home address
Home Agent
Care-of address
Home address
?????
CN ? HomeAddr
HA?CoA
Mobile Node
Foreign Agent
CoACare-of address
Foreign Network
23
RFC2002????????????(ForeignAgent???)
Home address
Care-of address
Correspondent Node
Home address
Home Agent
Care-of address
Home address
?????
CN ? HomeAddr
Mobile Node
Foreign Agent
Foreign Network
24
RFC2002????????????(ForeignAgent???)
Home address
Care-of address
Correspondent Node
Home address
HomeAddr ? CN
Home Agent
Care-of address
Home address
Mobile Node
Foreign Agent
Foreign Network
25
RFC2002????????????(ForeignAgent???)
Home address
Care-of address
CN ? HomeAddr
Correspondent Node
????
(Proxy ARP,Gratuitous ARP)
Home Agent
HomeAddr ? CN
Care-of address
Home address
?????
CN ? HomeAddr
CN ? HomeAddr
HA?CoA
?????
Mobile Node
CoACare-of address
Foreign Agent
Foreign Network
26
RFC2002????????????(Co-located Care-of
address???)
Home address
Care-of address
CN ? HomeAddr
Correspondent Node
????
(Proxy ARP,Gratuitous ARP)
HomeAddr ? CN
Home Agent
Home address
Care-of address
?????
?????
CN ? HomeAddr
HA?CoA
CN ? HomeAddr
Mobile Node
CoACare-of address
DHCP
Foreign Network
27
Foreign Agent???

• Foreign Network?Foreign Agent????
• Care-of Address?FA?IP????
• MobileNode???????????????????????????MN???
• ??????????

28
Co-located Care-of address???

• Foreign Network?Foreign Agent????
• Care-of Address?MobileNode?DHCP??????
• ForeignAgent????MobileNode??????
• ??????????
• 1?MN???????????????1??????????

29
IP Mobility Support (RFC2002)

• 1.Introduction ?MN????????
• 2.Agent Discovery
• 3.Registration ?MN????????
• 4.Routing Considerations ?MN??????
• 5.Security Considerations
• 6.Acknowledgements

30
Agent Advertisement/Solicitation
IP header
ICMP Router Advertisement Message
Type
Length
Sequence Number
Registration Lifetime
R B H F M GV
Zero or more Care-of addresses
RRegistration Required BBusy HHome
Agent FForeign Agent MMinimal
Encapslation GGRE Encapslation VVan Jacobson
header compression
31
Registration
Request packet
IP header
UDP header
Registration request
Mobile-Home Auth. Ext.
Mobile-Foreign Auth.Ext.
MN?FA?HA???
Reply packet
IP header
UDP header
Registration reply
Mobile-Home Auth. Ext.
Mobile-Foreign Auth.Ext.
HA?FA?MN???
Type
Length
SPI
Authentication Extention
Authenticator
32
Registration Request/Reply
Code 0,1O.K. 64-88NG by FA 128-Ng by HA
Lifetime
Type
Flag
Lifetime
Type
Flag
Home Address
Home Address
Home Agent
Home Agent
Care-of Address
Care-of Address
Identification
Identification
Extensions
Extensions
ltRegistration Requestgt
ltRegistration Replygt
SSimutaneous Binding BBroadcast
Datagram DDecapsulation by Mobile Node MMinimal
Encapslation GGRE Encapslation VV.Jacobson
Header Compression
S
B
D
M
G
C
rsv
ltFlaggt
33
Registration Extension
Type
Length
SPI
Authenticator
Type 32(Mobile-Home) 33(Mobile-Foreign) 34(Fore
ign-Home)
34
IP in IP CapslationIP Encapslation within IP
(RFC2003)
IP Header
SrcCN DstMNs Home
IP Payload
IP Header
IP Header
SrcCN DstMNs Home
IP Payload
SrcHA DstMNs CoA
20?????
35
Minimal EncapslationMinimal Encapslation within
IP (RFC2004)
IP Header
SrcCN DstMNs Home
IP Payload
IP Header
SrcCN DstMNs CoA
IP Payload
MNs Home Address
???12?????