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Mobile IP Constraints

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Mobile IP Constraints EvolutionEvolution ofof thethe InternetInternet CoreCore andand EdgeEdge IPIP WirelessWireless NetworkingNetworking USENIX Annual Technical Conference June 28, 2001 Boston, MA JimJim BoundBound PrinciplePrinciple MemberMember ofof TechnicalTechnical StaffStaff [email protected]@compaq.comom CharlieCharlie PerkinsPerkins NokiaNokia FellowFellow charliepcharliep@@iprgiprg..nokianokia.com.com 1 DiscussionDiscussion § Internet and Current Wireline IP Evolution § Wireless Evolution § IPv6 Evolution § Mobile IP Evolution § The Future: Wireless and Wireline Integrated 2 Internet and Current Wireline IP Evolution 3 InternetInternet CoreCore andand EdgeEdge Edge Communications Core Communications 4 InternetInternet AccessAccess PointPoint End User Wireline Internet Edge and Core Internet Services Workstation Workstation Workstation Access Points Access Points Wireless IP SS7 IP Gateway Gateway Comm. Tower Comm. Tower Comm. Tower 5 End User Wireless End User Telephony InternetInternet CharacterizationCharacterization TodayToday § Virtual Private Networks – Tunnels – Private Addresses – Secure at Edge or Access Only § Network Address Translation (NAT) Required § End-2-End Model is Lost § Try getting a Globally Routable IPv4 Address in Europe or Asia; or a set of them for your business !!! § These are not optimal conditions for the evolution of the Internet 6 InternetInternet engineersengineers areare workingworking onon itit !!!!!! § The Next Generation Internet Protocol is IPv6 and will restore the End-2-End model of the Internet § 2.5G and 3G Wireless requires the End-2-End model as it moves its use model to the Internet. § Mobile IP computing will revolutionize the Internet as the WEB did in the 90’s. § So lets discuss how this will happen!!! 7 Wireless Evolution 8 WirelessWireless EvolutionaryEvolutionary StagesStages Timeline Today 2002-2003 2003+ 2G 2.5G 3G GSM GPRS UMTS TDMA TDMA CDMA 1G CDMA CDMA 3G IPv4/IPv6 Mobile IPv6 2G 2.5G 3G IS-41 CDMA200 Full IP Voice 1XRTT Data 2.MB+ Digital Voice Digital Voice IP Transports + Analog Voice Data 100K+ Data 19.2K Gateways Voice Some IP Gateways Data 2MB 9 GSMGSM ArchitectureArchitecture PSTN ISDN Modem Bank PDN MS BTS MSC GMSC Modem Bank MS BTS BSC Modem Bank BTS EIR MS AUC HLR VLR 10 GSM/GPRSGSM/GPRS SystemSystem ArchitectureArchitecture PLMN’s PSTN SGSN GGSN ISDN Modem Bank MS BTS PDN Modem Bank BTS MS BSC Modem Bank BTS Other MS PLMN’s HLR EIR MSC/VLR User Plane AUC Control Plane 11 3G3G WirelessWireless ArchitectureArchitecture HLR/VLR Subscriber, Radio Access Network Policy, AAA, and Security Services Services Wireless Nodes Modem Bank Voice, Video, and Gaming Services Comm. Tower Internet Comm. Tower Core/Edge Comm. Tower Radio Access SGSN and GGSN and Comm. Tower Network Control Services Services Base Stations Other ISP Control Plane Services Server Content and User Plane Gateway Services Internet Plane 12 WhatWhat aboutabout thethe TelephoneTelephone NetworkNetwork Today?Today? § Circuit Based not Packet Based § Signal and Voice Channels for communications § These networks are evolving to IP § But IP will have to coexist with the Signaling System #7 Protocol for coexistence § So we need to discuss in this Wireless model briefly too !!! § Because it has Internet Engineering work in process too 13 SS7SS7 andand thethe WirelineWireline NetworkNetwork SCPSCP SCPSCP STPSTP STPSTP IPIP SS7 SS7 Links SSP SSPSSP SSP Voice Trunks 14 SS7SS7 andand thethe WirelessWireless NetworkNetwork SMSCSMSC HLRHLR AUCAUC EIREIR STPSTP STPSTP VLRVLR SS7 SS7 Links MSCMSC MSCMSC Comm. Tower Comm. Tower 15 IETFIETF SIGTRANSIGTRAN protocolsprotocols suitesuite § SCTP – Set of functions for reliable signaling transport § M2UA M2UAMGCP/MEGACO/H.248M3UA SUA IUA – transport the MTP2 user (MTP3) over IP SCTP § M3UA – transport the MTP3 users (SCCP, IP ISUP) over IP § SUA Physical – transport the SCCP user (TCAP) over IP § IUA – transport the ISDN signaling (Q.931) over IP 16 SCTPSCTP WhatWhat isis it?it? § New Transport Protocol and architectural peer component to TCP and UDP above the IP network Layer § It is NOT an application protocol or replacement for UDP or TCP § Architected to be transparent to IPv4 or IPv6 network layer component § IETF recommendations RFC 2960 17 Where SCTP will be added to a typical IP stack Internet Server Applications Network Utilities Autoconfiguration of Addresses RSVP DNS Network Mgmt Routing Mgmt Neighbor Processing Tunnel Configuration RSVP APIs Network APIs System Kernel APIs Socket Layer Protocol Control Blocks Transport Layer TCP/UDP + SCTP***** IPv4/IPv6 Routing Routing and Neighbor Caches Network Layer, ICMP, and Virtual Tunnel Interfaces IPv4 Module Callout Switch Firewall Screening IPv4 IPv4/IPv6 RSVP/QOS Processing IPv4/IPv6 ARP IPv4 Neighbor Discovery IPv6 Network Interface Control, Adapter Interfaces and Processing Queues, Mgmt, and Statistics 18 IPv6 Evolution 19 IPv4…IPv4… AA victimvictim ofof itsits ownown successsuccess § 1990 – IPv4 addresses being consumed at an alarming rate, projections show: § Class B address space exhausted by 1994 § All IPv4 address space exhausted between 2005 - 2011 – Internet routing tables suffering explosive growth – Efforts started to address these problems 20 InterimInterim measuresmeasures § CIDR (Classless Inter-Domain Routing) – Eased routing table growth for awhile – Multihoming punching holes in CIDR today § Private addresses – Reduced pressure on address space, but… – Necessitated NAT, ALGs – Obstacle to renumbering § Example: merger of 2 companies using net 10 – Additional management burden 21 NATNAT (Network(Network AddressAddress Translation)Translation) § Single point of failure § Performance penalty § Breaks applications that rely on End-2-End IP addressing (FTP, DNS, others) – Use ALGs § Prevents End-2-End IPsec 22 ALGsALGs (Application(Application LayerLayer Gateways)Gateways) § Example: www proxy servers § Single point of failure § Performance penalty § Requires detailed knowledge of each application – Barrier to deployment of new applications § Barrier to growth 23 InterimInterim measuresmeasures helped,helped, but…but… § Address space consumption slowed, but Internet growth accelerated § 1B mobile users by 2003 § 1B Internet users by 2005 § 90% of all new mobile phones will have internet access by 2003 (Morgan Stanley Dean Witter, May 2000) § Projections of address space exhaustion by 2010, pain sooner (Europe and Asia) 24 …… aa longerlonger termterm solutionsolution waswas soughtsought § 1991: Work starts on next generation Internet protocols – More than 6 different proposals were developed § 1993: IETF forms IPng Directorate – To select the new protocol by consensus § 1995: IPv6 selected – Evolutionary (not revolutionary) step from IPv4 § 1996: 6Bone started § 1998: IPv6 standardized § Today: Initial products and deployments 25 GrowthGrowth ofof wirelesswireless andand broadbandbroadband InternetInternet 1 Billion Subscribers WIRELESSWIRELESS && BroadbandBroadband InternetInternet Server-based 1 Billion Users Applications 300 Million Subscribers Switched Networks Market Size WIRELESSWIRELESS INTERNETINTERNET 200 Million Users 26 Source Cisco Systems 1998 2005 IPv6IPv6 ImmediateImmediate BenefitsBenefits § Increased Address Space – 128 bits § 2^128 is a really big number – Efficient addressing and routing topology – NAT is not required § Restores End-2-End IP addressing § And while we’re at it, we might as well make a few other improvements… 27 IPv6IPv6 ImmediateImmediate BenefitsBenefits (continued)(continued) § Architecture – Simplified IP header – Optimized for 64 bit architecture – Efficient and extensible IP datagram – Improved host and router discovery – Improved multicast scalability § Plug and Play – Dynamic Address Autoconfiguration (Stateless, Stateful) 28 IPv6IPv6 ImmediateImmediate BenefitsBenefits (continued)(continued) § Enhancements for dynamic renumbering of networks § Improved Mobile IP support § Mandatory network-layer authentication and privacy § Coexists with IPv4 § Other functions still evolving from the extensibility of the architecture 29 IETFIETF StandardizationStandardization statusstatus ofof IPv6IPv6 § Core specifications achieved Draft Standard status No No Yes RFC Yes RFC Yes RFC Internet Proposed Draft Internet Draft Standard Standard Standard Technically Multiple Significant complete Interoperable Operational Implementations Experience 6bone test bed Today 1991 1996 1998 timeline IPv6IPv6 IndustryIndustry DeploymentDeployment StatusStatus § Many products and Early Adopters kits available § Internet Registries are handing out IPv6 addresses. § Internet Service Providers are starting to provide IPv6 § IPv6 Forum (http://www.ipv6forum.com) – World-wide consortium including vendors and research/education community, to promote IPv6 by raising market and user awareness 31 IPv4IPv4 vs.vs. IPv6IPv6 HeaderHeader 0 bits 8 16 24 31 0 4 12 16 24 31 Ver IHL Service Type Total Length Version Class Flow Label Identifier Flags Fragment Offset Payload Length Next Header Hop Limit Time to Live Protocol Header Checksum 32 bit Source Address 128 bit Source Address 32 bit Destination Address Options and Padding IPv4 Header 128 bit Destination Address 20 octets, 12 fields, including 3 flag bits + fixed max number of options Changed Removed IPv6 Header 40 octets, 8 fields + Unlimited Chained Extension (options) Header 32 What has happened to our beloved IP stack? Internet Server Applications Network Utilities Autoconfiguration of Addresses RSVP DNS Network Mgmt Routing Mgmt Neighbor Processing
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