How to Handle mobile nodes? (Naming) Naming Use dHCP and update name-address mapping whenever host changes address FiXes contact problem but not broken transport connections 2021-129 26
How to Handle Mobile Nodes? (Naming) ß Naming Þ Use DHCP and update name-address mapping whenever host changes address Þ Fixes contact problem but not broken transport connections 2021-1-29 26
How to Handle mobile nodes? (Transport) TCP currently uses 4 tuple to describe connection k <Src Addr, Src port, dst addr, Dst port Modify tcp to allow peer's address to be changed during connection Security issues Can someone easily hijack connection? 本 Difficult deployment→ both ends must support mobility 2021-129
How to Handle Mobile Nodes? (Transport) ß TCP currently uses 4 tuple to describe connection Þ <Src Addr, Src port, Dst addr, Dst port> ß Modify TCP to allow peer’s address to be changed during connection ß Security issues Þ Can someone easily hijack connection? ß Difficult deployment both ends must support mobility 2021-1-29 27
How to Handle mobile nodes? (Link Layer) Link layer mobility Learning bridges can handle mobility this is how it is handled at cmu Encapsulated PPP(Pptp)> have mobile host act like he is connected to original Lan Works for IP And other network protocols 2021-129
How to Handle Mobile Nodes? (Link Layer) ß Link layer mobility Þ Learning bridges can handle mobility this is how it is handled at CMU Þ Encapsulated PPP (PPTP) Have mobile host act like he is connected to original LAN Works for IP AND other network protocols 2021-1-29 28
How to Handle mobile nodes? (Routing) Allow mobile node to keep same address and name How do we deliver iP packets when the endpoint moves? Can't just have nodes advertise route to their address What about packets from the mobile host? Routing not a problem What source address on packet?>this can cause problems Key design considerations scale Incremental deployment 2021-129
How to Handle Mobile Nodes? (Routing) ß Allow mobile node to keep same address and name ß How do we deliver IP packets when the endpoint moves? Þ Can’t just have nodes advertise route to their address ß What about packets from the mobile host? Þ Routing not a problem Þ What source address on packet? this can cause problems ß Key design considerations Þ Scale Þ Incremental deployment 2021-1-29 29
Basic Solution to Mobile Routing Same as other problems in computer ScIence k add a level of indirection Keep some part of the network informed about current location k Need technique to route packets through this location(interception Need to forward packets from this location to mobile host(delivery) 2021-129 30
Basic Solution to Mobile Routing ß Same as other problems in computer science Þ Add a level of indirection ß Keep some part of the network informed about current location Þ Need technique to route packets through this location (interception) ß Need to forward packets from this location to mobile host (delivery) 2021-1-29 30