Efficient End-to-End Mobility Support in IPv6
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1 Efficient End-to-End Mobility Support in IPv6, Mark Doll,
2 Communicating Anywhere, Anytime 1
3 Mobile IPv6 Basics mobile home address Internet visited network home network correspondent node 2
4 Mobile IPv6 Basics (2) binding home address c/o address home home address c/o address visited network home network correspondent node bidirectional tunneling 3
5 Mobile IPv6 Basics (3) home home address c/o address visited network home network correspondent node route optimization 4 binding home address c/o address
6 Caution! Issue 1: Connection hi-jacking Attacker pretends to own victim's (home) address attacker victim's peer victim 5 Solution: Verify reachability at home address
7 Caution! (2) Issue 2: Redirection-based flooding Attacker pretends to be at victim's (c/o) address attacker attacker's peer victim 6 Solution: Verify reachability at c/o address
8 Conservative Mobile IPv6 include tokens authenticated w/both tokens 7
9 Conservative Mobile IPv6 (2) 3 RTT 4 RTT 8 switch to new c/o address switch to new c/o address
10 Optimistic Mobile IPv6 2 3 RTT in parallel Return-routability procedure and home registration simultaneously 4 RTT 3 switch to new c/o address switch to new c/o address 9
11 Reduce handoff latency Early Binding Updates for Mobile IPv6 Credit-Based Authorization 10
12 Mobile IPv6 + Optimizations Home Test (Init) exchange prior to handoff home and correspondent registration simultaneously Test of c/o address in parallel with data exchange tentative registration without test of new c/o address standard registration with test of new c/o address 11
13 Mobile IPv6 + Optimizations (2) switch to new c/o address ~ 0 RTT switch to new c/o address 1 RTT 12
14 Mobile IPv6 + Optimizations (3) Correspondent node may send to incorrect c/o address 13
15 While C/O Address is Unverified Without protection amplified redirection-based flooding Amplification attacker attacker's peer victim investment << ROI 14
16 While C/O Address is Unverified (2) Credit-Based Authorization precludes amplification redirection-based flooding unattractive No amplification attacker attacker's peer victim investment >= ROI 15
17 While C/O Address is Unverified (3) Credit-Based Authorization precludes amplification redirection-based flooding unattractive No amplification attacker attacker's peer victim Correspondent node counts bytes recently received from mobile node 16 Sends no more bytes to unverified c/o address
18 Experimental Evaluation MAC filter FreeBSD Kame-Shisa Mobile IPv6 17 extended to support optimistic Mobile IPv6, Early Binding Updates, Credit-Based Auth.
19 IP Telephony: Parameters 18 Application bidirectional 64 kbps payload 10ms chunks 164B per packet (IPv6, IPv6 extensions, UDP, RTP) Round-trip times 200ms btw. home agent, routers, correspondent node Mobile IPv6 versions conservative optimistic Early Binding Updates, Credit-Based Authorization Confidence 500 handoffs per Mobile IPv6 version
20 Handoff Delay w/ip Telephony RTT = 200ms 1 RTT+ε 3 RTT+ε 4 RTT+ε 19
21 TCP File Downloads: Parameters 20 Application unidirectional download: correspondent node to mobile node 60s duration 1024 kbps bandwidth TCP Reno Round-trip times 40ms to 200ms btw. home agent, routers, correspondent node Mobile IPv6 versions conservative optimistic Early Binding Updates, Credit-Based Authorization Confidence 20 experiments per round-trip time per Mobile IPv6 version 5 handoffs per experiment
22 Handoff Delay w/tcp File Transfers 21
23 Throughput w/tcp File Transfers Why does TCP benefit so much? 22
24 Why TCP Benefits So Much 1st timeout new c/o address ebu/cba 1st timeout old c/o address 2nd timeout new c/o address conserv 23
25 Why TCP Benefits So Much (2) After 1st timeout set cwnd = 1 set ssthresh = flightsize do Slow Start until cwnd > ssthresh After 2nd timeout set cwnd = 1 set ssthresh = 2 (minimum) skip Slow Start, do Congestion Avoidance 24
26 Conclusions, Future Perspectives 25 Handoff latencies are high in standard Mobile IPv6 4 RTT in conservative Mobile IPv6 3 RTT in optimistic Mobile IPv6 Early Binding Updates, Credit-Based Authorization 1 RTT disadvantage: some additional signaling UDP, TCP applications benefit significantly Handoff latencies down by 75% in UDP 1 TCP retransmission timeout instead of 2 Faster throughput ramp-up after handoff Efforts within IETF and IRTF Adopted by Mobopts research group Credit-Based Authorization adopted by Mipshop, HIP working groups Current work: Proactive registration before handoff Eliminate/reduce remaining 1 RTT handoff latency
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