Mobile I Pv6
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Mobile I Pv6

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Unit 3 Of ACN

Unit 3 Of ACN

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    Mobile I Pv6 Mobile I Pv6 Presentation Transcript

    • Mobile IPv6
      • Mobility feature is integrated into IPv6
      • Mobility is a MUST feature in IPv6
      • Mobile IPv6 shares many features with Mobile IPv4
      • Offers many other improvements
        • Implemented by Mobility Extension Headers
        • Efficient data transfer
    • Differences between Mobile IPv4 and Mobile IPv6
      • There is no need to deploy special routers as "foreign agents", as in Mobile IPv4.
      • Care-of address obtained by auto configuration
      • Multiple Care-of Addresses
      • Mobile IPv6 operates in any location without any special support required from the local router ( Foreign Agent)
      • Support for route optimization is a fundamental part of the protocol
    • Differences between Mobile IPv4 and Mobile IPv6
      • No nonstandard set of extensions
        • In IPv4
          • Extensions to Router advertisement, solicitation messages
          • Registration req and reply as UDP messages
      • Communication modes
        • Reverse tunneling
        • Route optimisation
      • Most packets sent using an IPv6 routing header rather than IP encapsulation
      • Messages for authentication ( Mobile Security )
    •  
    •  
    • Messages
      • ICMPv6 messages 
        • Home Agent Address Discovery Request
        • Home Agent Address Discovery Reply
        • Mobile Prefix Solicitation
        • Mobile Prefix Advertisement
    • Messages
      • IPv6 Mobility extension headers
        • Binding Update ( Equivalent to IPv4 registartion req)
        • Binding Acknowledgement ( Equivalent to IPv4 registartion reply)
        • Binding Refresh Request ( for Renewal )
        • Binding Error
        • Following are for authentication
        • Home Test Init
        • Home Test
        • Care-of Test Init
        • Care-of Test
    • Mobile IP Security
      • A malicious device could interfere with registration Process
        • causing the datagrams intended for a mobile device to be diverted
      • A “bad guy” might also interfere with the data forwarding process
        • by encapsulating a bogus datagram to trick a mobile node into thinking it was sent something that it never was
      • replay attack
        • A third party intercepts a datagram, holds onto it and then re-sends it later on
        • the home agent might be fooled into thinking the node has traveled away from home when it has not
    • Security Measures
      • Measures in IPv4
        • authentication of Registration Request and Registration Reply messages
        • Similar to IPSec(AH)
        • The Identification field used in Registration Request and Registration Reply messages is designed to prevent replay attacks
      • Measures in IPv6
        • Home Test Init
        • Home Test
        • Care-of Test Init
        • Care-of Test
    •  
    • Home Test Init
      • A mobile node sends a Home Test Init message to the correspondent node (via the home agent) to acquire the home keygen token.
      • The contents of the message can be summarized as follows:
      • * Source Address = home address
      • * Destination Address = correspondent
      • * Parameters: home init cookie
    • Care-of Test Init
      • The mobile node sends a Care-of Test Init message to the correspondent node (directly, not via the home agent) to acquire the care-of keygen token.
      • The contents of this message can be summarized as follows:
      • * Source Address = care-of address
      • * Destination Address = correspondent
      • * Parameters:
      • + care-of init cookie
    • Home Test
      • The Home Test message is sent in response to a Home Test Init message. It is sent via the home agent.
      • The contents of the message are:
      • * Source Address = correspondent
      • * Destination Address = home address
      • * Parameters:
      • + home init cookie
      • + home keygen token
      • + home nonce index
      • home keygen token := First (64, HMAC_SHA1 (Kcn, (home address | nonce | 0)))
    • Care-of Test
      • This message is sent in response to a Care-of Test Init message.
      • This message is not sent via the home agent, it is sent directly to the mobile node.
      • The contents of the message are:
      • Source Address = correspondent
      • Destination Address = care-of address
      • Parameters:
      • care-of init cookie
      • care-of keygen token
      • care-of nonce index
      • care-of keygen token :=First (64, HMAC_SHA1 (Kcn, (care-of address | nonce | 1)))
    • Generation of KBM
      • When the mobile node has received both the Home and Care of Test messages, the return routability procedure is complete.
      • As a result of the procedure, the mobile node has the data needs to send a Binding Update to the correspondent node.
      • The mobile node hashes the tokens together to form a 20 octet binding key Kbm:
      • Kbm = SHA1 (home keygen token | care-of keygen token)
    • Binding Update
      • The contents of the Binding Update include the
      • following:
      • * Source Address = care-of address
      • * Destination Address = correspondent address
      • * Parameters:
      • + home address
      • + sequence number
      • + home nonce index
      • + care-of nonce index
      • First (96, HMAC_SHA1 (Kbm, (care-of address correspondent | BU)))