Past Present Future Conclusion - wiki.freifunk.net · 2013-10-07 · batman-adv scalability Layer 2...
Transcript of Past Present Future Conclusion - wiki.freifunk.net · 2013-10-07 · batman-adv scalability Layer 2...
![Page 1: Past Present Future Conclusion - wiki.freifunk.net · 2013-10-07 · batman-adv scalability Layer 2 Mesh Networks - Myths and Risks Linus Lüssing Freifunk Hamburg Geekend02, Sep.](https://reader033.fdocuments.us/reader033/viewer/2022050314/5f771b85b8c712060e48dcaf/html5/thumbnails/1.jpg)
IntroductionPast
PresentFuture
Conclusion
batman-adv scalabilityLayer 2 Mesh Networks - Myths and Risks
Linus Lüssing
Freifunk Hamburg Geekend02, Sep. 2013
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IntroductionPast
PresentFuture
Conclusion
Outline
1 IntroductionLayer 2 Mesh Networks
2 PastExperiences From Lübeck
3 PresentStatistics From Hamburg
4 FutureFeatures in Development
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IntroductionPast
PresentFuture
Conclusion
Layer 2 Mesh Networks
Outline
1 IntroductionLayer 2 Mesh Networks
2 PastExperiences From Lübeck
3 PresentStatistics From Hamburg
4 FutureFeatures in Development
![Page 4: Past Present Future Conclusion - wiki.freifunk.net · 2013-10-07 · batman-adv scalability Layer 2 Mesh Networks - Myths and Risks Linus Lüssing Freifunk Hamburg Geekend02, Sep.](https://reader033.fdocuments.us/reader033/viewer/2022050314/5f771b85b8c712060e48dcaf/html5/thumbnails/4.jpg)
IntroductionPast
PresentFuture
Conclusion
Layer 2 Mesh Networks
batman-adv: Big, Virtual Switch
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IntroductionPast
PresentFuture
Conclusion
Layer 2 Mesh Networks
batman-adv: Big, Virtual Switch
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IntroductionPast
PresentFuture
Conclusion
Layer 2 Mesh Networks
batman-adv: Encapsulation
Encapsulates ethernet framesIn own batman-adv header
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IntroductionPast
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Layer 2 Mesh Networks
Advantages
Supports IPv4, IPv6, probably IPv42, ...Your non-IP / link-layer protocol?More flexible than Linux IP routing table:
Interface bondingNetwork coding...
Simple configurationMAC addresses are uniqueNo IP subnet coordination
Fast Roaming...
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IntroductionPast
PresentFuture
Conclusion
Layer 2 Mesh Networks
Disadvantage: Overhead
Layer 3 mesh routing protocol:Mesh protocol overhead
Layer 2 mesh routing protocol:Mesh protocol overhead+ Layer 2 specific overhead
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IntroductionPast
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Conclusion
Layer 2 Mesh Networks
Disadvantage: Overhead
IEEE 802.11s:Designed for ∼32 nodes
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IntroductionPast
PresentFuture
Conclusion
Layer 2 Mesh Networks
Disadvantage: Overhead
”Layer 2 Mesh Networks? Don’t Scale!”
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IntroductionPast
PresentFuture
Conclusion
Experiences From Lübeck
Outline
1 IntroductionLayer 2 Mesh Networks
2 PastExperiences From Lübeck
3 PresentStatistics From Hamburg
4 FutureFeatures in Development
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IntroductionPast
PresentFuture
Conclusion
Experiences From Lübeck
Experiences from Freifunk Lübeck
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IntroductionPast
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Experiences From Lübeck
1 Node: Kernel panics
2009, pre 0.1 firmwareDid not boot: batman-adv crashing
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IntroductionPast
PresentFuture
Conclusion
Experiences From Lübeck
1 Node: Kernel panics
2009, pre 0.1 firmwareDid not boot: batman-adv crashing
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IntroductionPast
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Experiences From Lübeck
10 Nodes: Too Large Neighbourhood on VPN
Trying out batman-adv over VPN, using tinc:tinc does meshing, too:Large neighbourhood on VPN: many rebroadcastsOverhead on DSL got close to 1MBit/s
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IntroductionPast
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Experiences From Lübeck
Changes in 0.2
October 2011
Added tincOGM (= route update + link quality) interval:
1s -> 3s
Should scale to 30 nodes then, right?
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IntroductionPast
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Experiences From Lübeck
15-20 Nodes: Again, Too Large Neighborhood on VPN
Wrong assumption about OGM scalability:
Linear to number of nodes in line topologyBut squared to number of local neighbour nodes
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IntroductionPast
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Conclusion
Experiences From Lübeck
Changes in 0.3
August 2012: fastd
Decreased neighbourhood size on VPNPeer-Groups: Connection to two of n gateway nodes
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IntroductionPast
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Experiences From Lübeck
80 Nodes: Multicast Overhead
Two wifi neighboursMeasured on adhoc wifi interfaceResult: Losing about 25% airspace
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IntroductionPast
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Experiences From Lübeck
80 Nodes: Multicast Overhead - Types
Service Announcements: SSDP, LLMNR, MDNSAddress Resolution: ARP+ICMPv6
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IntroductionPast
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Experiences From Lübeck
Changes in 0.3.2.1
April, 2013batman-adv 2013.0.0: Distributed ARP TableMulticast Rate: 1MBit/s⇒ 12MBit/sRebroadcasts on VPN: 3⇒ 1Filter for non-essential multicast packets
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IntroductionPast
PresentFuture
Conclusion
Statistics From Hamburg
Outline
1 IntroductionLayer 2 Mesh Networks
2 PastExperiences From Lübeck
3 PresentStatistics From Hamburg
4 FutureFeatures in Development
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IntroductionPast
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Conclusion
Statistics From Hamburg
Test Setup
tcpdump on fastd VPN tunnel interfaceThu Sep 19 00:00:00 2013 - Thu Sep 19 23:59:59 2013
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IntroductionPast
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Statistics From Hamburg
RX by batman-adv type, average Bits/s
fastd:+66Bytesheaders∼ 94KBit/saverage1.5% of ADSL,6MBit/s
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IntroductionPast
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Statistics From Hamburg
TX by batman-adv type, average Bits/s
∼ 80KBit/saverage14% of ADSL,576KBit/s
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IntroductionPast
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Statistics From Hamburg
RX by batman-adv type, Packets/180s
OGM ��∝ #clientsBCAST ∝ #clients
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IntroductionPast
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Statistics From Hamburg
RX by multicast type, average Bits/s
Bandwidth hog:ICMPv6
Many nodes withold firmware:
DAT notrunning idealStill much:SSDP+MDNS+NBNS+LLMNR
Size vs. Rate
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IntroductionPast
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Statistics From Hamburg
RX by ICMPv6 type, average Bits/s
Most:NeighborDiscovery
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IntroductionPast
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Statistics From Hamburg
Statistics: Conclusions
OGM and layer 2 specific multicast overhead about thesameIPv6 ND is currently the largest layer 2 specific overheadGetting close to the ADSL upload limit
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IntroductionPast
PresentFuture
Conclusion
Features in DevelopmentVillains
Outline
1 IntroductionLayer 2 Mesh Networks
2 PastExperiences From Lübeck
3 PresentStatistics From Hamburg
4 FutureFeatures in Development
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IntroductionPast
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Conclusion
Features in DevelopmentVillains
”Split horizon” for multicast payload frames
No rebroadcasts for packets on/from VPN interface
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IntroductionPast
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Features in DevelopmentVillains
”Split horizon” for multicast payload framesThu Sep 26 21:14:08 UTC 2013eth1 / traffic statistics
rx | tx--------------------------------------+------------------
bytes 19.83 MiB | 10.39 MiB--------------------------------------+------------------
max 572 kbit/s | 340 kbit/saverage 90.25 kbit/s | 47.31 kbit/s
min 32 kbit/s | 16 kbit/s--------------------------------------+------------------
packets 223391 | 102620--------------------------------------+------------------
max 758 p/s | 395 p/saverage 124 p/s | 57 p/s
min 38 p/s | 16 p/s--------------------------------------+------------------
time 30.00 minutes
Thu Sep 26 21:44:08 UTC 2013
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IntroductionPast
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Features in DevelopmentVillains
”Split horizon” for multicast payload framesThu Sep 26 21:14:06 UTC 2013eth2 / traffic statistics
rx | tx--------------------------------------+------------------
bytes 19.59 MiB | 3.24 MiB--------------------------------------+------------------
max 488 kbit/s | 56 kbit/saverage 89.16 kbit/s | 14.73 kbit/s
min 32 kbit/s | 4 kbit/s--------------------------------------+------------------
packets 222931 | 28916--------------------------------------+------------------
max 635 p/s | 57 p/saverage 123 p/s | 16 p/s
min 45 p/s | 7 p/s--------------------------------------+------------------
time 30.00 minutes
Thu Sep 26 21:44:06 UTC 2013
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IntroductionPast
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Conclusion
Features in DevelopmentVillains
”Split horizon” for multicast payload frames
Here: 47.31KBit/s vs. 14.73KBit/sEliminates next bottleneck: ADSL upload
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IntroductionPast
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Features in DevelopmentVillains
Distributed Address Table
Distributed Hash Table for IPv6 Neighbor DiscoveryLike current DAT (Distributed ARP Table), but for IPv6, tooEliminates current largest ICMPv6 overhead:
IPv6 Neighbor Discovery
Status: Patchset submitted, not upstream yet
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IntroductionPast
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Features in DevelopmentVillains
Multicast Awareness
Send multicast packets to interested nodes onlyRemoves most ICMPv6 overhead:
Neighbor Solicitations, MLD Reports, ...
Status: First basic patchset submitted
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Features in DevelopmentVillains
B.A.T.M.A.N. IV - Echo Location Protocol
Image Source: Petteri Aimonen, Wikimedia Commons, CC-BY-SA
Perform link quality measurements with own packet type:ELPReduced overhead through different intervals for OGMsand ELPEasier to optimize OGM propagation
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IntroductionPast
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Features in DevelopmentVillains
Script-Kiddie: Mallory
Playing with physical or virtual link layerLocal disaster (mostly?)
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IntroductionPast
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Features in DevelopmentVillains
Super Villain: Joker
Knows batman wellGlobal disaster
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IntroductionPast
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Conclusion
Current batman-adv algorithm is optimized for sparsenetworks
Keep node neighbourhood smallCommon LL-Service-Announcement protocols:
Don’t scale... :(
With this flat and VPN architecture,batman-adv / layer 2 meshing works with:
80 nodes: without multicast filters300+ nodes: with multicast filters
Eliminating Layer 2 specific overhead:Is on the horizon