Master Course Computer Networks IN2097
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1 Chair for Network Architectures and Services Prof. Carle Department of Computer Science TU München Master Course Computer Networks IN2097 Prof. Dr.-Ing. Georg Carle Christian Grothoff, Ph.D. Stephan Günther Chair for Network Architectures and Services Department of Computer Science Technische Universität München
2 Chair for Network Architectures and Services Prof. Carle Department of Computer Science TU München Transport Layer - continuation -
3 Roadmap q Advanced Transport Layer Concepts q Internet Protocol, The Internet Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/2013 3
4 Advanced Transport Layer Concepts q Buffer bloat q TCP for high bandwidth long distance connections q TCP Throughput Formula q Overview of Deployment of TCP variants q Detection of TCP-unfriendly Flows q Multipath TCP Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/2013 4
5 TCP Congestion Control q Variable Threshold q At loss event, Threshold is set to 1/2 of CongWin just before loss event triple duplicate ack Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/2013 5
6 TCP Reno q TCP Fast Recovery algorithm described in RFC 2581 q Implementation introduced 1990 in BSD Reno release q Behaviour sender only retransmits a packet after a retransmit timeout has occurred or after three duplicate acknowledgements have arrived triggering the Fast Retransmit algorithm. a single retransmit timeout might result in the retransmission of several data packets each invocation of the Fast Retransmit algorithm leads to retransmission of only a single data packet problems may arrive when multiple packets are dropped from a single window Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/2013 6
7 TCP and Buffer Bloat q q Capacities of router queues Large queue = good: Less packet losses at bottlenecks Do you agree? What would happen to TCP? Effects of large buffers at bottleneck on TCP connections Once queues are full: Queueing delays increase significantly or even dramatically TCP congestion control gets no early warning No duplicate ACKS ð no Fast Retransmit Instead: Sudden timeouts Congestion windows way too large Many parallel TCP connections over same link get warning way too late Synchronisation: Oscillation between All send way too much and all get frightened by timeouts and send way too little Huge variations in queueing delays ð DevRTT becomes very large ð Timeout value becomes very large Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/2013 7
8 Buffer bloat - ICSI Netalyzr Measurements Explored Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/2013 8
9 TCP for High Bandwidth Long Distance Connections q Several transport protocol variants for high bandwidth long distance connections (LFNs - Long Fat Networks) exist q Frequent property Effectively use available bandwidth Unfriendly doesn t play nicely with others Unfair to different RTT flows achieves better performance than standard TCP is not fair to standard TCP q General approaches for congestion control loss-based: NewReno, CUBIC delay-based: Vegas, CAIA Delay Gradiant (CDG) Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/2013 9
10 TCP NewReno q c.f. RFC April 2004, Proposed Standard q Properties addresses problems that may arrive when multiple packets are dropped from a single window Base algorithm described in RFC 2582 did not attempt to avoid unnecessary multiple Fast Retransmits after timeout. RFC 2582 also defined "Careful" variant that avoids these unnecessary Fast Retransmits Careful variant of RFC 2582 NewReno as default Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
11 TCP CUBIC q CUBIC Loss-based congestion control optimised for high bandwidth, high latency q Properties modified window-growth-control algorithm window grows slowly around W max fast probing growth away from W max Standard TCP outperforms CUBIC s window growth function in short RTT networks. CUBIC emulates standard (time-independent) TCP window adjustment algorithm, select the greater of the two windows (emulated versus cubic) q Implemenation: in Linux since kernel , in FreeBSD 8-STABLE Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
12 TCP Vegas q TCP Vegas by Lawrence Brakmo, Sean W. O'Malley, Larry L. Peterson at University of Arizona published at SIGCOMM 1994 q Properties delay-based congestion control uses i th RTT > min RTT + delay threshold, delay measured every RTT Additive Increase Additive Decrease (AIAD) to adjust cwnd q Properties implementations available for Linux and BSD Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
13 Delay Gradient TCP q D. Hayes, G. Armitage, "Revisiting TCP Congestion Control using Delay Gradients," IFIP/TC6 NETWORKING 2011, Valencia, Spain, 9-13 May q CDG ( CAIA Delay-Gradient ) modified TCP sender behaviour: uses delay gradient as a congestion indicator tolerates non-congestion packet loss, and backoff for congestion related packet loss works together with loss-based congestion control flows, e.g. NewReno Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
14 Comparison of TCP Variants q Grenville Armitage: A rough comparison of NewReno, CUBIC, Vegas and CAIA Delay Gradient TCP (v0.1), CAIA Technical report A, 29 July caia.swin.edu.au/reports/110729a/caia-tr a.pdf q SPP Synthetic Packet Pairs Tool Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
15 Multipath TCP q IETF Working Group Multipath TCP (mptcp) q Key goals deployable and usable without significant changes to existing Internet infrastructure usable by unmodified applications stable and congestion-safe, including NAT interactions q Objectives a. An architectural framework for congestion-dependent multipath transport protocols b. A security threat analysis for multipath TCP c. A coupled multipath-aware congestion control algorithm d. Multi-addressed multipath extensions to current TCP e. Application interface considerations Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
16 Multipath TCP q q TCP Extensions for Multipath Operation with Multiple Addresses, draft-ietf-mptcp-multiaddressed MPTCP Application Interface Considerations, draft-ietf-mptcp-api-06.txt Milestones Submit to IESG architectural guidelines and security threat analysis as informational RFC(s) Submit to IESG basic coupled congestion control as an experimental RFC Consensus on what high-level changes are needed to the current MPTCP Experimental document in order to progress it on the standards track Apr 2013 Implementation advice (Informational) to IESG Aug 2013 Use-cases and operational experiences (Informational) to IESG Dec 2013 MPTCP-enabled middleboxes (Informational) to IESG Dec 2013 MPTCP standards track protocol to IESG Jan 2014 Re-charter or close Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
17 Chair for Network Architectures and Services Prof. Carle Department of Computer Science TU München Internet Protocol
18 Functional Components routing protocol routing table updates Routing functions routing protocol Control incoming IP datagrams routing table lookup routing table IP Forwarding outgoing IP datagrams Datapath: per-packet processing Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
19 The Internet Network layer Host, router network layer functions: The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again. Transport layer: TCP, UDP Network layer Routing protocols path selection RIP, OSPF, BGP forwarding table IP protocol addressing conventions datagram format packet handling conventions ICMP protocol error reporting router signaling Link layer physical layer Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
20 ICMP: Internet Control Message Protocol q used by hosts & routers to communicate network-level information error reporting: unreachable host, network, port, protocol echo request/reply (used by ping) q network-layer above IP: ICMP msgs carried in IP datagrams q ICMP message: type, code plus first 8 bytes of IP datagram causing error Type Code description 0 0 echo reply (ping) 3 0 dest. network unreachable 3 1 dest host unreachable 3 2 dest protocol unreachable 3 3 dest port unreachable 3 6 dest network unknown 3 7 dest host unknown 4 0 source quench (congestion control - not used) 8 0 echo request (ping) 9 0 route advertisement 10 0 router discovery 11 0 TTL expired 12 0 bad IP header Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
21 Traceroute and ICMP q Source sends series of UDP segments to destination First has TTL =1 Second has TTL=2, etc. Unlikely port number q When nth datagram arrives to nth router: Router discards datagram And sends to source an ICMP message (type 11, code 0) Message includes name of router& IP address q When ICMP message arrives, source calculates RTT q Traceroute does this 3 times Stopping criterion q UDP segment eventually arrives at destination host q Destination returns ICMP dest port unreachable packet (type 3, code 3) q When source gets this ICMP, stops. Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
22 IP addressing: CIDR CIDR: Classless InterDomain Routing subnet portion of address of arbitrary length address format: a.b.c.d/x, where x is # bits in subnet portion of address subnet part /23 host part Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
23 IP addresses: how to get one? Q: How does network get subnet part of IP addr? A: gets allocated portion of its provider ISP s address space ISP's block /20 Organization /23 Organization /23 Organization / Organization /23 Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
24 Hierarchical addressing: route aggregation Hierarchical addressing allows efficient advertisement of routing information: Organization /23 Organization /23 Organization /23 Organization /23. Fly-By-Night-ISP Send me anything with addresses beginning /20 Internet ISPs-R-Us Send me anything with addresses beginning /16 Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
25 Hierarchical addressing: more specific routes ISPs-R-Us has a more specific route to Organization 1 Organization /23 Organization /23 Organization /23. Fly-By-Night-ISP Send me anything with addresses beginning /20 Internet Organization /23 ISPs-R-Us Send me anything with addresses beginning /16 or /23 Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
26 IP addressing: the last word... Q: How does an ISP get block of addresses? A: ICANN: Internet Corporation for Assigned Names and Numbers allocates addresses manages DNS assigns domain names, resolves disputes Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
27 How big is the Internet? q Many measures: networks (routed entities) domains, host names (but: several names per host!) directly (continuously) attached hosts ( ping able ) IP-connected hosts (including dialin, e.g. PPP) firewalled hosts reachable q What is the German Internet? Entities within Germany Entities operated by Germans / German organisations Entities used by Germans / German organisations Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
28 Counting q Worldwide q q > Hosts > Autonomous Systems > Assigned IP Addresses > Reachable IP Addresses Europe > Hosts > Autonomous Systems > Reachable IP Addresses > Assigned IP Addresses Germany > Hosts > Autonomous Systems > Assigned IP Addresses (5.500 prefixes) > Reachable IP Addresses Snapshot 2011 Network IN Master Security, Course WS 2008/09, Computer Chapter Networks, 9 WS 2012/
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