1 / 32

Sideseadmed (IRT0040) loeng 5/2010

Sideseadmed (IRT0040) loeng 5/2010. Avo avots@lr.ttu.ee. SIP Signaling: A’s address = Public IPv6 Addr 1. SIP Proxy. SIP Proxy. IMS with IPv6. Multi-country/Multi-operator SIP-connectivity network. Public IP-routing domain (inter-operator connections). Media from B to A:

masao
Download Presentation

Sideseadmed (IRT0040) loeng 5/2010

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Sideseadmed (IRT0040)loeng 5/2010 Avoavots@lr.ttu.ee

  2. SIP Signaling: A’s address = Public IPv6 Addr 1 SIP Proxy SIP Proxy IMS with IPv6 Multi-country/Multi-operator SIP-connectivity network PublicIP-routing domain(inter-operatorconnections) Media from B to A: Sent to Public IPv6 Addr 1 Client, Public IPv6 address 2 Client, Public IPv6 address 1

  3. Terminology (1) Home Agent (HA) Foreign Agent (FA) HN FN Mobile Host (MH)

  4. Terminology (2) • Similar to cellular. • Mobile Node (MN or MH): node changing its PoA. • Correspondent Host (CH). • Home Network (HN) and Foreign Network (FN).

  5. Terminology (3) • Mobility Agents: • Home Agent (HA): router on MN’s HN that tunnels datagrams to MH when away and keeps MH’s current location info. • Foreign Agent (FA): router on foreign network; delivers datagrmas to MH while on FN. • Home Address (HoA) and Care-of Address (CoA): • HoA: MH’s permanent address on HN. • CoA: MH’s temporary address on FN.

  6. Mobile-IP: Basic Operation • MH normally uses its home address HoA. • When MH visits a foreign network, • Registration with FA. • Discover mobile agent and CoA. • Registration with HA. • Binding update (HoA -> CoA). • Communicating with MN: use HoA. • HA forwards packet from HoA to CoA.

  7. Discovering Agents Agents periodically beacon advertisements

  8. Agent Discovery • Agent advertisement (beaconing): • Mobile agent broadcast agent advertisement at regular intervals (“I am here”). • Agent solicitation: • MH can poll (“anyone here?”). • Mobile agent responds to poll.

  9. Discovering Agents MH polls; agent responds.

  10. Agent Advertisement • Allow for the detection of mobility agents. • Follows ICMP router advertisement message. • Let the MH know whether the agent is a HA, or a FA. • List one or more available care-of addresses. • Inform the MN about special features provided by FA. • Example: Alternative encapsulation techniques, header compression.

  11. Registration

  12. Registering • When away, MH registers its CoA with HA (binding update). • Binding: (HoA->CoA) • Binding has a lifetime. • Registration process • MH sends a registration request with CoA. • HA authenticates request. • HA approves or disapproves the request. • HA adds necessary information to its routing table. • HA sends registration reply back to MH.

  13. Tunneling • HA tunnels datagrams destined to MH when MH is away. • Datagrams sent to MH, intercepted by HA and tunneled to its CoA. • Tunnel terminates at MH CoA (either the MH or the FA).

  14. Tunneling SRC Tunneled Data Packet HA keeps binding between MH and FA

  15. Encapsulation • Tunneling requires encapsulation. • Sending the original packet (CH->MH) in another packet (HA->CoA). • Default encapsulation mechanism: • IP-within-IP (tunnel). • Tunnel header: new IP header inserted by the tunnel source (home agent). • Destination IP: CoA

  16. Mobile IP Basic Operation • Entities • Mobile host, home agent, foreign agent, corresponding host • Discovering Care-of Addresses • Agent advertisements • Registering Care-of Address • Security • Tunneling to Care-of Address • IP-within-IP encapsulation

  17. Tunneling in Mobile IP

  18. Mobile IPv6 • Mobility support in IPv6 (RFC 3775) • Mobile node (MN) is a mobile device with an IPv6 home address • Correspondent node (CN) is a computer with which mobile node communicates using its home address. • Home Agent (HA) helps MN to manage its mobility: • Mobile node can always be reached at its home address, regardless of its point of attachment (care-of address) to the Internet. • Connections made with home address survive movement between different IP networks.

  19. Mobile IPv6 addressing • IP addresses act as both an identifier for a node and as a locator. • Mobile IPv6 separates the identity, home address of mobile node from its locator, known as care-of address (CoA). • Without Mobile IPv6 MN can not use its home address for sending and receiving packets when it is outside its home network. • Mobile IPv6 uses IP-IP tunneling to create a virtual network between its CoA and HA, so that MN always appears to be in its home network.

  20. Tunnel IPv6 hdr (CoA –HA) IPv6 hdr (HoA-CN) Data Reverse Tunneling • IPv6 in IPv6 tunnel is used for delivering traffic to and from home address of MN via HA. • HA uses proxy neighbor discovery to redirect packets on home link destined to home address of MN to its own link layer address. • HA keeps track of the care-of address of MN to deliver packets to MN.

  21. Tunnel Binding Ack. Proxy ND for HoA Router Advertisement Binding Update Router solicitation MN forms Care-of address Mobile IPv6 operation

  22. Route in Mobile IPv6 • Tunneling of traffic between MN and CN via home agent is not efficient. • HA is a potential bottleneck • Extra routing hop increases network latency • Route optimization (RO) allows MN and CN to communicate directly • MN sends a BU to CN. • MN and CN use home address option and routing header, type 2 to send packets to each other. • Route optimization is secured using return routability protocol.

  23. Mobile IPv6 Implementations • Windows • MS Research implementation MN, CN, HA • MS CN implementation for Win XP • Elmic software: embedded MN • Linux • MIPL (Helsinki University of Technology): MN/CN/HA • Elmic software: embedded MN • Symbian: MN • Cisco: HA • Nokia: HA

  24. Mobile IPv6 extensions • Localized mobility management • Hierarchical Mobile IPv6 • Fast Mobile IPv6 • Context transfer to new router: Context transfer protocol • Early discovery of new router: Candidate access router discovery protocol

  25. Network Mobility

  26. IP IP tunnel NEMO (RFC 3963) Operation Network a:: Network b:: Network a:1::

  27. IPv4 Mobility vs IPv6 Mobility

  28. IPv4 Mobility vs IPv6 Mobility

  29. IPv4 Mobility vs IPv6 Mobility

  30. Lingid http://en.wikipedia.org/wiki/Mobile_IP http://tools.ietf.org/html/rfc3344 http://en.wikipedia.org/wiki/Mobile_IP http://en.wikipedia.org/wiki/Mobility_management http://www.iec.org/online/tutorials/tmn/

  31. Mobile IP http://www.ietf.org/rfc/rfc3344.txt?number=3344 http://www.ietf.org/rfc/rfc3775.txt?number=3775 http://www.hznet.de/ipv6/mipv6-intro.pdf http://www.ipv6.org.uk/workshop/slides/ipv6_workshop2_module3_final_animated.ppt

  32. Mobile IPv6 • Mobile IPv6: RFC 3775 • Securing Mobile IPv6 MN-HA signaling: RFC 3776 • Hierarchical MIPv6: RFC 4140 • Fast Mobile IPv6: RFC 4068 • Context transfer protocol: RFC 4067 • Candidate access router discovery protocol: RFC 4068 • Network Mobility (NEMO) Basic Support Protocol: RFC 3963

More Related