Mobile Ad-hoc Network. WIDE project/keio University
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1 Mobile Ad-hoc Network WIDE project/keio University
2 ToC Global Internet Connectivity MANET/NEMO integration IPv6 Support on MANET
3 MANET on the Internet Where can MANET be deployed in our daily life? Internet consists on the hierarchical routing. All mobility protocols face to redundant routes due to the hierarchical routing (i.e. dog-leg, triangle routing). MANET can bypass the hierarchical routing structure dynamically Problem Statements Lack of Mobility Support for Mobile Ad-hoc Network. Lack of Route Optimization Lack of MANET Scalability. Ad-hoc routes are very effective to reach to the Internet. ex. When a vehicle enter a tunnel, it connects an AR at the outside tunnel by MANET Internet Internet
4 Global Internet Connectivity Internet access capability makes MANET more powerful and useful MANET = leaf network connects to the Internet MIP6 and NEMO can operate in MANET via Internet Gateway draft-wakikawa-manet-globalv6-03.txt
5 Internet Gateway (IGW) Internet Gateway Discovery Globally Routable IPv6 address Assignment Route Setup Route Discovery Route Examination Mobile IPv6/NEMO Support
6 MANET meets MIP/NEMO
7 NEMO Basic Support Protocol CN MR Internet Bi-directional Tunnel IP-in-IP Encapsulation HA Binding Cache MR HoA MR CoA MNP MR HoA MNN
8 Signaling Explicit Binding Update IP header HoA IPsec BU (R) MNP/len Implicit Binding Update IP header HoA IPsec BU (R) MR Internet 1. Binding Update 2. Binding Acknowledgement HA Prefix Table MR HoA - MNP Binding Cache MR HoA MR CoA MNP MR HoA
9 MANET/NEMO,MIP integration MANET is capability to solve MIP/NEMO related issues Better Route Nested Mobility MIP/NEMO address MANET issues Address Assignment Continuous communication Classification MANET: Local Mobility and Shortcut Route Route Establishment/Management Bypassing Routing Hierarchy NEMO: Global Mobility and Movement Transparency Permanent Address/Prefix Assignment Continuous Communication
10 Redundant Routes Redundant route is caused by bi-directional tunnel overhead between MN/MR and Home Agent Hierarchy Routing causes redundant route length How to bypass Hierarchical routing? Try to establish routes between end-nodes by MANET eliminates tunnel overhead and redundant route path Home Agent Home Agent Home Agent Home Agent
11 Running MANET at interface?! INTERNET (WAN) egress interface MR ingress interface Mobile Network (LAN) Run manet at egress interface Leaking routes to the Internet is not permitted, but the routing domain must be small MR MR MR Run manet at any interface (egress or ingress) MR MR
12 Nested Mobility!? Bypassing bi-directional tunnel by utilizing manet routes MANET is designed for mobile nodes Home Agents Access router(s) Access router(s) root-mr1 root-mr2 root-mr1 root-mr2 sub-mr1 sub-mr3 sub-mr1 sub-mr3 sub-mr2 sub-mr4 sub-mr2 sub-mr4 VMN1 VMN2 VMN1 VMN2
13 Mobile Gateway (MG) Mobile Gateway Supporting NEMO Basic Support Supporting Internet Gateway Overlay manet network to connect mobile networks Mobile Network is treated as a MANET cluster Each Cluster is connected by Mobile Gateway Not necessary to run MANET by nodes inside each cluster Internet MG MG MG Internet Connectivity with NEMO support Overlay MANET for inter mobile network connectivity MG MG: Mobile Gateway Mobile Network
14 Route Selection HA Internet HA Internet Internet MG MG MG MG MG MG MG MG MG direct route nemo route detour route
15 Route Selection Route Selection among Three Routes: direct route, nemo route, detour route according to network environment and flow characteristic. Mobile Gateway can change the route during communication without any interruption, because of mobility support direct route is used when two end-nodes communicate over manet routes on the MG overlay network direct route is managed by each MG at overlay MANET nemo route is used when two end-nodes communicates over the Internet with mobility support nemo route is managed by each MG with the basic NEMO detour route is used when a MG looses its Internet connectivity and borrow adjacent MG's or Internet Gateway's Internet connectivity detour route is discovered by each MG at overlay MANET.
16 IPv6 Ready?!
17 Why IPv6 Support Experimental RFC Focus on IPv4 Ad-hoc network requires many addresses Personal Area Network Vehicles Supporting IPv6 is urgent Routing messages are changed to IPv6 address length NDP interaction Address Assignments Global Connectivity
18 Messages Changes Address fields are changed to store IPv6 address space Network address fields are changed to store IPv6 prefix address and its length
19 Address Assignments IPv6 has 3 different scope for IPv6 addresses global scope optional, only nodes who needs global connectivity link-local scope mandate, to all IPv6 nodes site-local scope (deprecated) IPv6 allows to assign multiple addresses on an interface ex. link local address x 1, global address x 2 Which IPv6 address is used for limited Broadcast address main address
20 Limited Broadcast Address Limited broadcast address on IPv6 is all-node multicast address (ff02::1) All IPv6 nodes joins to ff02::1 the link Link local address can not be used to transmit packets over multi-hop. Routers can not forward packets sent to/from link-local address. MANET simply uses ff02::1 as the limited broadcast address source address: olsr node s link local address destination address: ff02::1
21 Main address main address is used to create routes for a node 4 options link-local scope address as a main address global scope address as a main address Any scope address as a main address (ignore scope) manet address
22 Link-local as main address all nodes have link-local scope address Even when a node-a gets a route (more than one hop away) for a node-b. it can not route packets with the route packets meant for a Link Local scope address can not be routed on intermediate nodes Node D may route NS for NodeA using the route NDP relies on link-local scope NDP is stateful complicated protocol Receiving NA A B C D sending NS
23 Global as main address All nodes do not have a global address Two different global addresses Home Address which is not topologically correct address Global address which is assigned by AR and is topologically correct address OLSR node needs to get a global address to exchange routing messages Need route to get a global address from a Gateway
24 Any scope as main address same issues when link-local scope is used as a main address
25 Manet address as main address New address block for manet new manet scope new manet address block from global scope (ex. 2001:x:/16) Concept of manet address all nodes have a manet address generated by similar approach of LL address The manet address is only valid within manet This address s packet MUST NOT be leaked to the Internet Each node exchanges routing messages using the manet address and creates routes for manet nodes using the manet address. The manet address can be used communication within manet, but it is better to use global scope address if available All manet node multicast address may be defined if necessary
26 Address Assignment for MANET Link local address is an interface address of each MANET node and is used to exchange MANET messages (src/dst address of IP header) Manet address is a main address of each MANET node Scope Validity Protocol Communicati on Link Local on-link NDP on-link Manet address within MANET MANET routing protocol on-link, within manet Global Internet (Global6) Any
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