lectures notes for 2013

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Aim This course will give both practical and general knowledge on the protocols that are the basis of the Internet. After this course you should have a good knowledge about Internet protocols and internetworking architecture. You should have a general knowledge aiding you in reading research and standardization documents in the area. Maguire Aim 1: 5 of 105 maguire@kth.se 2013.03.18 Internetworking/Internetteknik
Learning Outcomes Following this course a student should be able to: • Understand the principles on which internetworking is based - which define the Internet (both what it is and why it has proven to be so succesful) • Understand TCP/IP protocol stack, layering, encapsulation and multiplexing • Understand multiplexing, demultiplexing, upward and downward multiplexing • Encapsulation as used for Mobile IP, Virtual Private Networks (VPNs), IP security, ... and other tunnelling protocols • Understand how information is encoded in headers and how the choice of this encoding and field size may effect the use and evolution of a protocol • Understand how data is encoded in the body of a packet and how this may effect internetworking - especially in the presence of firewall and network address translators. • Understand IP Addressing, subnetting and address resolution - including the interaction of protocols across layers • Understand a number of higher layer protocols including the security risks and performance limitations of each Maguire Learning Outcomes 1: 6 of 105 maguire@kth.se 2013.03.18 Internetworking/Internetteknik
Page 1 and 2: IK1550 & IK1552 Internetworking/Int
Page 3 and 4: Internetworking....................
Page 5 and 6: Virtual Interface (VIF)............
Page 7 and 8: Module 2: IP Basics: Routing, ARP,
Page 9 and 10: Wireshark’s IO Graph functionalit
Page 11 and 12: ICMP Redirect .....................
Page 13 and 14: Building a UDP packet from scratch
Page 15 and 16: Module 5: TCP, HTTP, RPC, NFS, X...
Page 17 and 18: Problems with multiple connections.
Page 19 and 20: Module 6: SCTP ....................
Page 21 and 22: Module 7: Dynamic Routing .........
Page 23 and 24: BGP Open Message ..................
Page 25 and 26: IGMP Implementation Details........
Page 27 and 28: Capacity Assignment ...............
Page 29 and 30: Network Management Systems ........
Page 31 and 32: Module 10: IPv6 ...................
Page 33 and 34: Why IPv6? .........................
Page 35 and 36: Wireless WANs . . . . . . . . . . .
Page 37 and 38: Module 12: IPSec, VPNs, Firewalls,
Page 39 and 40: Module 13: Future and Summary......
Page 41 and 42: Peer to peer networking ...........
Page 43 and 44: Module 14: Some exercises..........
Page 45 and 46: Welcome to the Internetworking cour
Page 47: Goals, Scope and Method Goals of th
Page 51 and 52: Prerequisites • Datorkommunikatio
Page 53 and 54: Topics • What an internet is and
Page 55 and 56: Grades: A..F (ECTS grades) • To g
Page 57 and 58: Written Assignment Goal: to gain an
Page 59 and 60: Literature The course will mainly b
Page 61 and 62: Schedule for Period 4 2013: Lecture
Page 63 and 64: Context of the course “The networ
Page 65 and 66: Running out of IPv4 addresses IPv4
Page 67 and 68: How can we deal with all of these d
Page 69 and 70: Basic concepts open-architecture ne
Page 71 and 72: Internetworked Architecture H … M
Page 73 and 74: Trends: Shifting from traditional t
Page 75 and 76: IP traffic growing exponentially! T
Page 77 and 78: Growth rates Some people think the
Page 79 and 80: Increasing Data Rates “Ethernet
Page 81 and 82: The Internet Today Local … Local
Page 83 and 84: Implicit vs. Explicit Information V
Page 85 and 86: Encapsulation Appl header user data
Page 87 and 88: • Transport layer • Port number
Page 89 and 90: IP “Protocol” field (RFC 1700)
Page 91 and 92: Decimal Keyword Protocol References
Page 97 and 98: Basic communication mechanism: data
Page 99 and 100:
Common Used Simple Services Name TC
Page 101 and 102:
Simple Campus Network WAN ISP’s r
Page 103 and 104:
How important are switches vs. rout
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LAN Protocols Data link Layer LLC S
Page 107 and 108:
IEEE 802.2/802.3 Encapsulation (RFC
Page 109 and 110:
SLIP (RFC 1055) IP datagram c0 1 db
Page 111 and 112:
Robust Header Compression (rohc) He
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PPP frames FLAG ADDR CNTL 7E FF pro
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Loopback interface IP output functi
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Virtual Interface (VIF) IP output f
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Wireshark, tcpdump, etc. Wireshark
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Figure 18: After capturing some pac
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Example: Comma Separated Values "No
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Figure 20: Second step in conversio
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Example of what can be done Figure
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print PTMP "$time $RSSId\n"; $count
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From an eariler version of the prog
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Address types • Unicast = one-to-
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Classless addressing: Subnetting IP
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Subnet mask 32 bit value with a 1 f
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Slash notation continued Length (CI
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Private addresses Private addresses
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ifconfig, route, and netstat Comman
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Summary • Course Introduction •
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References [1] Barry M. Leiner, Vin
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IK1550 & IK1552 Internetworking/Int
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Connection-oriented vs Connectionle
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Direct vs. indirect Delivery • Di
Page 155 and 156:
Processing Rouing daemon route comm
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Routing Table Search - Classless
Page 159 and 160:
Routing Tables • Aggregate IP add
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Host vs. router - two behaviors •
Page 163 and 164:
Routing Control Plane Routing Table
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ARP and RARP Address resolution (lo
Page 167 and 168:
Address Resolution: ARP, RARP Host
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ARP example 1 hostname ftp://B.kth.
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ARP Timeouts • If there is no rep
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Proxy ARP (RFC 826) Lets a router o
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Additional ARP commands • publish
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non ARP example 1 B packet demultip
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RARP - as seen with ethereal Time S
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Alternatives to RARP In a later lec
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For looking at and generating packe
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nucmed30:/home/maguire # /usr/sbin/
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Wireshark (formerly Ethereal) First
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Linux Socket filter If you want to
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Tools Used: sock + tcpdump tcpdump
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} if (inet_aton(destination_host, (
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Some statistics on this packet trac
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Traffic generators • Distributed
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References [1] Renesas Technology C
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Page 203 and 204:
Internet Protocol version 4 (IPv4)
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MTU≡Maximum Transmission Unit MTU
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Fields relevant to Fragmentation
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Serial line throughput At 9,000 bit
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Application Recommended Value for T
Page 213 and 214:
Problems with precedence • As soo
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Differentiated services If bits 3,
Page 217 and 218:
Header Checksum • Ensures integri
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IP Options Encoding Two styles: •
Page 221 and 222:
Internet Control Message Protocol (
Page 223 and 224:
ICMP Redirect ICMP Redirect message
Page 225 and 226:
PING examples On a Solaris machine:
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Ping with record route option $ pin
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ICMP Summary • Destination (Netwo
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References [1] K. Ramakrishnan, S.
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• UDP • Socket API • BOOTP
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Main Transport layer protocols Thre
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8 byte header + possible data UDP H
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Reserved and Available UDP Port Num
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MTU and Datagram Fragmentation If d
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Interaction between UDP and ARP Wit
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Still a problem? A UDP with 8192 pa
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Maximum UDP Datagram size • theor
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Socket API • int socket(int domai
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#include #include #include #incl
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#include #include #include #incl
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Building a UDP packet from scratch
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packetsize+=ip->ihlcheck=0; /* igno
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• the router gets all 100 packets
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BOOTP: Bootstrap Protocol (RFC 951)
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Vendor specific information (RFC 14
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• DHCP Message Type - the type of
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other identification information ab
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DHCP performance problems Most impl
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DHCP and DNS • There is no dynami
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IP header UDP header 20 bytes 8 byt
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DNS: Domain Name Service (RFC 1034,
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DNS Message format 0 16 31 Identifi
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New top level domains There is a pr
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Country Code Top-Level Domains (CCT
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See Stevens, Vol. 1, figure 14.2, p
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kth.se kth.se kth.se Authoritative
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Another examine in MX RR format: MX
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Storing other attributes - TXT reco
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Root servers ROOT-SERVERS.NET IP ad
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F root nameserver nodes Site Code L
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Where is i.root-servers.net ? trace
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DDNS RFC 2136: Dynamic Updates in t
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DNS performance From www.dnsserverl
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Web performance Using Page Speed (h
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Public/Commercial DNS services A nu
Page 305 and 306:
References [1] Joe Abley, f.root-se
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Lecture 4: Outline • TCP • HTTP
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Transmission Control Protocol (TCP)
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TCP Header 0 7 8 15 16 23 24 31 16
Page 313 and 314:
Control field - indicates the purpo
Page 315 and 316:
SYN Flooding Attack It is clear tha
Page 317 and 318:
TCP options These options are used
Page 319 and 320:
Sliding window Flow control • rec
Page 321 and 322:
keystroke Flow for an rlogin sessio
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Nagle Algorithm telnet/rlogin/... g
Page 325 and 326:
Delayed acknowledgements Rather tha
Page 327 and 328:
Bandwidth-Delay Product How large s
Page 329 and 330:
Congestion Control We introduce a C
Page 331 and 332:
• cwnd starts at number of bytes
Page 333 and 334:
Karn’s algorithm When a retransmi
Page 335 and 336:
Van Jacobson’s Fast retransmit an
Page 337 and 338:
TCP Persist Timer If the window siz
Page 339 and 340:
TCP Performance TCP’s path MTU di
Page 341 and 342:
Measuring TCP Performance Measured
Page 343 and 344:
TCP servers Stevens, Vol. 1, pp. 25
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2 message types: • request HTTP P
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HTTP Header names (See Stevens, fig
Page 349 and 350:
Client Caching Client can cache HTT
Page 351 and 352:
Multiple simultaneous connections t
Page 353 and 354:
Problems with multiple connections
Page 355 and 356:
What happens when you make an HTTP
Page 357 and 358:
HTTP performance Joe Touch, John He
Page 359 and 360:
Network File System (NFS) NFS is ba
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• program number, program version
Page 363 and 364:
Port Mapper RPC server programs use
Page 365 and 366:
NFSspy problem Imagine several stud
Page 367 and 368:
NFS protocol, version 2 (RFC 1094)
Page 369 and 370:
NFS File Handles To reference a fil
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NFS Procedures Procedure NFSPROC_GE
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NFS Statelessness NFS is designed t
Page 375 and 376:
• All clients (even those on diff
Page 377 and 378:
Xscope Interpose a process between
Page 379 and 380:
Program tcptrace xplot testrig aspa
Page 381 and 382:
Summary This lecture we have discus
Page 383 and 384:
Page 385 and 386:
Stream Control Transmission Protoco
Page 387 and 388:
SCTP Header 0 7 8 15 16 23 24 31 16
Page 389 and 390:
Association establishment - 4-way h
Page 391 and 392:
• Transmission sequence number (T
Page 393 and 394:
State Cookie Use of the COOKIE prev
Page 395 and 396:
COOKIE ACK Chunk 0 7 8 15 16 23 24
Page 397 and 398:
Multiple-Streams Sending Process Re
Page 399 and 400:
ERROR chunk Sent when an endpoint f
Page 401 and 402:
Association Shutdown Active close t
Page 403 and 404:
SCTP Example - Daytime [6] server#
Page 405 and 406:
ethereal capture - daytime - INIT-A
Page 407 and 408:
ethereal capture - daytime - COOKIE
Page 409 and 410:
ethereal capture - daytime - SACK F
Page 411 and 412:
ethereal capture - daytime - SHUTDO
Page 413 and 414:
Fault Management • Endpoint Failu
Page 415 and 416:
Heartbeat and ACK Frame x … Sourc
Page 417 and 418:
Path MTU Discovery • IPv4 • Bas
Page 419 and 420:
SCTP header continued • Reliabili
Page 421 and 422:
• Receiver can use the Stream i a
Page 423 and 424:
Transport Protocol Functional Overv
Page 425 and 426:
References [1] G. Sidebottom, K. Mo
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Page 429 and 430:
Routing Control Plane Routing Table
Page 431 and 432:
Basic Router Software Architecture
Page 433 and 434:
Routing packets in the Internet Rou
Page 435 and 436:
Routing Metrics A measure of which
Page 437 and 438:
Intradomain routing protocols also
Page 439 and 440:
RIP v1 operation As carried out by
Page 441 and 442:
Problems with RIP v1 • RIPv1 does
Page 443 and 444:
Split Horizon To counter the count
Page 445 and 446:
RIP extensions (aka RIP-2) Defined
Page 447 and 448:
Interior Gateway Routing Protocol (
Page 449 and 450:
IGRP Route Poisoning IGRP poisons r
Page 451 and 452:
Enhanced IGRP (EGRP) [6] Uses the d
Page 453 and 454:
OSPF uses the Shortest Path First a
Page 455 and 456:
Common header The 5 types of OSPF p
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Database Description packet 0 7 8 1
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• Length of the whole packet in b
Page 461 and 462:
Link state request packet 0 7 8 15
Page 463 and 464:
Interdomain routing protocols also
Page 465 and 466:
BGP - Border Gateway Protocol An ex
Page 467 and 468:
BGP operation BGP routers exchange
Page 469 and 470:
Classless Inter-Domain Routing (CID
Page 471 and 472:
Resulting BGP Architecture AS1 AS2
Page 473 and 474:
BGP Open Message 0 7 8 15 16 23 24
Page 475 and 476:
BGP Keepalive Message 0 7 8 15 16 2
Page 477 and 478:
Interconnections of networks Since
Page 479 and 480:
Commercial Internet eXchange (CIX)
Page 481 and 482:
Some of Sweden’s Internet exchang
Page 483 and 484:
NAPs today Using GigE, switch fabri
Page 485 and 486:
Internet Routing Registry (IRR) •
Page 487 and 488:
Cisco’s NetFlow Switching Routing
Page 489 and 490:
Cisco’s Tag Switching Combine rou
Page 491 and 492:
Tag Locations • in the Layer 2 he
Page 493 and 494:
Routers do more than routing Routin
Page 495 and 496:
References [1] J. Hawkinson and T.
Page 497 and 498:
Page 499 and 500:
Multicast and IGMP Maguire Multicas
Page 501 and 502:
Filtering up the protocol stack UDP
Page 503 and 504:
Other approaches to One-to-Many and
Page 505 and 506:
Multicast Backbone (MBONE) Expandin
Page 507 and 508:
Core Problem How to do efficient mu
Page 509 and 510:
IP WAN Multicast Requirements • C
Page 511 and 512:
Internet Multicast Addresses http:/
Page 513 and 514:
Mapping Multicast (Class D) address
Page 515 and 516:
IGMP: Internet Group Management Pro
Page 517 and 518:
Joining a Multicast Group • a pro
Page 519 and 520:
Group membership State Transitions
Page 521 and 522:
IGMP Version 3 [4] • Joining a mu
Page 523 and 524:
Frame 1: IGMP Membership Query Ethe
Page 525 and 526:
Frame 12: IGMP v1 Membership Report
Page 527 and 528:
Multicast routing AS1 AS2 AS3 AS4 A
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Multicasting Example: Transmitting
Page 531 and 532:
Delivery Trees: different methods
Page 533 and 534:
Link-State Multicast: MOSPF [5] Jus
Page 535 and 536:
• RPF results in a different span
Page 537 and 538:
RPB + Prunes ⇒ Reverse Path Multi
Page 539 and 540:
Multicast Routing - Steiner Tree’
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Protocol-Independent Multicast (PIM
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Multicast backbone (MBONE) [2] Why
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Benefits for Conferencing • IP Mu
Page 547 and 548:
MBONE growth 1600 1400 1200 Nodes 1
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MBONE connections MBONE is an “ov
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Multicast Source Discovery Protocol
Page 553 and 554:
Single Source Multicast (SSM) [15]
Page 555 and 556:
Tools for managing multicast “Man
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Protocol-Specific Multicast Routing
Page 559 and 560:
QoS & Scheduling algorithms Predict
Page 561 and 562:
Functionality • RSVP is receiver
Page 563 and 564:
Jitter Control • if network has e
Page 565 and 566:
RSVP Protocol Mechanism • Sender
Page 567 and 568:
RSVP operation S 1 R 1 R 2 S 2 Figu
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RSVP Summary • RSVP supports mult
Page 571 and 572:
Further reading IETF Routing Area,
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References [1] Joe Abley, f.root-se
Page 575 and 576:
Page 577 and 578:
ISO FCAPS Network Management Model
Page 579 and 580:
Network Management Process Simple N
Page 581 and 582:
SNMPv3 March 1997, the SNMPv3 Worki
Page 583 and 584:
Management Information Base: MIB MI
Page 585 and 586:
SNMP Traps Agent sends a trap to ma
Page 587 and 588:
RMON Probes or Monitors Network mon
Page 589 and 590:
Ethernet Statistics Group “These
Page 591 and 592:
EtherHistoryEntry::= SEQUENCE { eth
Page 593 and 594:
Host Top N group Used to prepare re
Page 595 and 596:
RMON2 Information collected from ne
Page 597 and 598:
Proprietary MIBs to extend RMON fun
Page 599 and 600:
WEB based Management Using the Web
Page 601 and 602:
Web Based Enterprise Management Ini
Page 603 and 604:
Four Elements of DMI • a format f
Page 605 and 606:
Java and Management Java Management
Page 607 and 608:
Policy Based Management See the rec
Page 609 and 610:
Voice over IP (VoIP) First we will
Page 611 and 612:
Deregulation continued ⇒ New oper
Page 613 and 614:
Increasingly IP based data+voice in
Page 615 and 616:
Voice over IP (VOIP) Gateways not o
Page 617 and 618:
VOIP Modes of Operation • PC to P
Page 619 and 620:
Cisco 3800 supports even more CODEC
Page 621 and 622:
Intranet Telephone System On Januar
Page 623 and 624:
http://www.homerun.telia.com/ Telia
Page 625 and 626:
VOIP vs. traditional telephony In
Page 627 and 628:
VON (Voice on the Net) Conferences
Page 629 and 630:
on the path. The one signal is read
Page 631 and 632:
VoIP details Carry the speech frame
Page 633 and 634:
RTP and H.323 for IP Telephony audi
Page 635 and 636:
Alice invites Bob to a SIP session:
Page 637 and 638:
Bob’s response 1 SIP/2.0 200 OK V
Page 639 and 640:
SIP Status codes SIP status codes a
Page 641 and 642:
Further Reading IP Telephony (iptel
Page 643 and 644:
Twitter Twitter is a service based
Page 645 and 646:
References [1] Paul McFedries, twit
Page 647 and 648:
• IPv6 Lecture 6: Outline Maguire
Page 649 and 650:
Growth • Currently IPv4 serves a
Page 651 and 652:
Networked Entertainment Your TV wil
Page 653 and 654:
IPv6 features • Expanded Addressi
Page 655 and 656:
Demultiplexing Initially, it was as
Page 657 and 658:
Quality-of-Service Capabilities •
Page 659 and 660:
IPv4 Protocol type ⇒ IPv6 Next He
Page 661 and 662:
Addressing • 128 bits long • th
Page 663 and 664:
Address Allocation [17] and [22] Bi
Page 665 and 666:
For an analysis of use from the poi
Page 667 and 668:
Special Address Formats Unspecified
Page 669 and 670:
Multicast Addresses 4 bit 4 bit 111
Page 671 and 672:
FF02:0:0:0:0:0:3 FF02:0:0:0:0:1:1 F
Page 673 and 674:
Anycast Sending a packet to a gener
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Routing header Next Header (8 bits)
Page 677 and 678:
Destination Options header Next Hea
Page 679 and 680:
Hop-by-Hop Options header Same basi
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IPSEC IPv6 implementation The US Na
Page 683 and 684:
Type: 1, 2, 3, or 4: IPv6 ICMP Erro
Page 685 and 686:
IPv6 ICMP and groups Three group me
Page 687 and 688:
DNS and IPv6 A new record type “A
Page 689 and 690:
Why IPv6? • solves Internet scali
Page 691 and 692:
RIR assignments of IPv6 addresses T
Page 693 and 694:
Migration to IPv6 A set of prioriti
Page 695 and 696:
Further information See: http://www
Page 697 and 698:
References [1] S. Deering and R. Hi
Page 699 and 700:
[26] J. Rajahalme, A. Conta, B. Car
Page 701 and 702:
• Mobile IP Outline Maguire Outli
Page 703 and 704:
Mobility γ Z C X A1 Y B α γ Z C
Page 705 and 706:
Objectives of Mobile IP • To prov
Page 707 and 708:
How can Z continue to communication
Page 709 and 710:
Establishing Identity When a node a
Page 711 and 712:
Could the MSR functionality be coll
Page 713 and 714:
Back to the original problem: Z wan
Page 715 and 716:
Alternative 2 Initially X is locate
Page 717 and 718:
Alternative 4 Initially X is locate
Page 719 and 720:
How does Z know to send things to M
Page 721 and 722:
Wireless Local Area Networks cell a
Page 723 and 724:
Simulcasting in Wireless Local Area
Page 725 and 726:
A Mobile-IP(V4) Scenario IP in IP t
Page 727 and 728:
IP-in-IP Encapsulation In-in-IP vs.
Page 729 and 730:
Temporary Address Assignment Two ty
Page 731 and 732:
Agent Advertisement Message Format
Page 733 and 734:
MN Requirements An MN must have:
Page 735 and 736:
HA Requirements Each HA must have:
Page 737 and 738:
Problems of Mobile IP (RFC2002) •
Page 739 and 740:
CDMA2000 Extension to Mobile IP A d
Page 741 and 742:
HAWAII extension is similar to Cell
Page 743 and 744:
Cellular IP (CIP): Location Update
Page 745 and 746:
Hierarchical FA and Regional Tunnel
Page 747 and 748:
Why not simply use Dynamic DNS (DDN
Page 749 and 750:
References [1] . B. Aboba and M. Be
Page 751 and 752:
• IPSec, VPN, … • Firewalls &
Page 753 and 754:
Virtual Private networks (VPNs) lea
Page 755 and 756:
GSS-API Generic Security Services A
Page 757 and 758:
ESP packet Consists of: • a contr
Page 759 and 760:
ISAKMP ISAKMP is based on the Diffi
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Firewalls exterior interior (often
Page 763 and 764:
Firewall Design apply basics of sec
Page 765 and 766:
SOCKs Permeo Technologies, Inc.’s
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MBONE through firewalls http://www.
Page 769 and 770:
U.S. DOE CIAC’s Network Security
Page 771 and 772:
The Network Mapper (NMAP) Network M
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Demilitarized zone (DMZ) Internet e
Page 775 and 776:
Security Organizations and Companie
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[1] IETF Security Area http://sec.i
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Prentice-Hall, 2001, ISBN 0-13-0861
Page 781 and 782:
Outline • Third generation of net
Page 783 and 784:
Third generation of networking Van
Page 785 and 786:
From PANs to RANs and beyond The co
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Delay Tolerant Networks (DTNs) Trad
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Growth rates n = number of users Sa
Page 791 and 792:
Growth in Internet hosts 6e+08 ✧
Page 793 and 794:
Long tail Frequency Items Figure 3:
Page 795 and 796:
Free Chris Anderson’s Free: The F
Page 797 and 798:
Working for free Once you have food
Page 799 and 800:
Quality of Service (QoS) QoS refers
Page 801 and 802:
Constraint-based Routing QoS routin
Page 803 and 804:
Routers: Performance 1/2 to 1 Milli
Page 805 and 806:
From the X2T11 standards activity F
Page 807 and 808:
• Internet Fibre Channel Protocol
Page 809 and 810:
Clustering Myricom, Inc. http://www
Page 811 and 812:
Very high-speed Backbone Network Se
Page 813 and 814:
Gigapops Who will be operating them
Page 815 and 816:
Terabit per second == 10 12 Future
Page 817 and 818:
Active networks A C F,d C F(d) A B
Page 819 and 820:
Internetworking as the future? Now
Page 821 and 822:
Counter currents However, there are
Page 823 and 824:
Implicit vs. Explicit Information V
Page 825 and 826:
Peer to peer networking Lots of the
Page 827 and 828:
Resource pooling Damon Wischik, Mar
Page 829 and 830:
Context of the module Personal comm
Page 831 and 832:
Personal monitoring Darwin Valderas
Page 833 and 834:
Vehicular ad hoc networks (VANETs)
Page 835 and 836:
Packages Logistics (tracking, routi
Page 837 and 838:
Appliances • Is the refrigerator
Page 839 and 840:
Environment Monitoring air and wate
Page 841 and 842:
Trossen’s Tussle Internet User Ag
Page 843 and 844:
Trossen’s Design principles to Ar
Page 845 and 846:
• Server and Network Bandwidth an
Page 847 and 848:
Evolution of new varieties of netwo
Page 849 and 850:
How do I know where I am? Location
Page 851 and 852:
Requirements • Systems with which
Page 853 and 854:
Badge Communications Model Badges a
Page 855 and 856:
Smart Badge Sensors Details of the
Page 857 and 858:
A view of the packaged badge As sho
Page 859 and 860:
Split the functions between access
Page 861 and 862:
Personal Computing and Communicatio
Page 863 and 864:
Future Systems Audio I/O GPS source
Page 865 and 866:
Non-metalic bi-directional neural i
Page 867 and 868:
Spotting trends at 1% Mark J. Penn
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Further Reading [1] Kalevi Kilkki,
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[23] Darwin Valderas Núñez, “In
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Thanks Best wishes on your written
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Internets - configuration 1 Figure
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Adding a firewall and router Intern
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Adding a WiMAX link Internets - con
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Adding two-way multimedia Configura
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