forked from freifunk-franken/docs
vxlan in der Node-Firmware
Signed-off-by: Robert Langhammer <rlanghammer@web.de>
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---
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title: "Node Firmware"
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date: 2022-11-25T23:29:16+01:00
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---
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Einblick in die Technik der node-firmware
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<!--more-->
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{{< section >}}
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---
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title: "Batman über VXLAN"
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date: 2022-11-25T23:31:14+01:00
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---
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Anbindung der node-Router an die Gateways via VXLAN
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<!--more-->
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## Motivation
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VXLAN ist eine ressourcenschonende Möglichkeit den Layer 2 Tunnel zum Gateway zu realisieren.
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Die Erfahrungen mit fastd haben gezeigt, dass dies bei kleinen Routern mit schwacher CPU (z.B WR841) der Flaschenhals ist.\
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[SpeedTest Vergleich fastd und VXLAN](speedtest-vxlan-vs-fastd.txt)
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Es lassen sich auch sehr günstige Gateways realisieren, die mehrere Hoods performant versorgen können.
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## Konzept
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Die Daten für den VXLAN-Tunnel erhält der Router mit dem Hoodfile. Ein entsprechender `vpn` Eintrag muss vorhanden sein:
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```
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---
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"vpn": [
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{
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"protocol": "vxlan",
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"address": "gateway.url"
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}
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],
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---
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```
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Der Router konfiguriert damit ein VXLAN Interface `vxlan0` als weiteres batmaninterface.
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Das VXLAN interface wird mit einer geringeren `hop_penalty` konfiguriert und somit bevorzugt.
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In aller Regel werden die node-Knoten über einen Router mit NAT Funktionalität am Internet teilnehmen. Darüber ist nur ein einziger VXLAN-Tunnel via IPv4 möglich. Diese Einschränkung gilt für IPv6 nicht. Aus diesem Grund ist VXLAN nur via IPv6 implementiert.
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Auf den Gateways wird die jeweilige VXLAN Gegenstelle konfiguriert und ebenfalls als weiteres batman-adv Interface in die Hood gehängt.
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## Konfiguration des Gateways
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[Freifunk-Gateway aufsetzen/VPN/vxlan -> Freifunk Wiki](https://wiki.freifunk-franken.de/w/Freifunk-Gateway_aufsetzen/VPN/vxlan)
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## Testen
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Zum Testen `http://rl-fff1.fff.community/v2/` als keyserver eintragen. Man findet den Eintrag in der Datei
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`/usr/lib/functions/fff/hoodfile`
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```
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echo "Getting hoodfile from Keyserver"
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if /bin/busybox wget -T15 -O "$file" "http://rl-fff1.fff.community/v2/?lat=$lat&long=$long"; then
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return 0
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```
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In den Hoods Schweinfurt, Hassfurt, Ebern, Coburg, Gerolzhofen ist VXLAN aktiv.
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Messung direkt vom Gateway via 100/40 dsl
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Gerät: WR841N v9.0
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Am Clientport
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Via VXLAN
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Download
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Connecting to host 10.83.44.2, port 5201
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Reverse mode, remote host 10.83.44.2 is sending
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[ 5] local 10.83.47.127 port 33214 connected to 10.83.44.2 port 5201
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[ ID] Interval Transfer Bitrate
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[ 5] 0.00-1.00 sec 8.09 MBytes 67.8 Mbits/sec
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[ 5] 1.00-2.00 sec 8.63 MBytes 72.4 Mbits/sec
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[ 5] 2.00-3.00 sec 8.65 MBytes 72.5 Mbits/sec
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[ 5] 3.00-4.00 sec 8.69 MBytes 72.9 Mbits/sec
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[ 5] 4.00-5.00 sec 8.67 MBytes 72.7 Mbits/sec
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[ 5] 5.00-6.00 sec 7.75 MBytes 65.0 Mbits/sec
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[ 5] 6.00-7.00 sec 8.61 MBytes 72.2 Mbits/sec
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[ 5] 7.00-8.00 sec 8.64 MBytes 72.5 Mbits/sec
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[ 5] 8.00-9.00 sec 7.06 MBytes 59.2 Mbits/sec
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[ 5] 9.00-10.00 sec 8.53 MBytes 71.5 Mbits/sec
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- - - - - - - - - - - - - - - - - - - - - - - - -
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[ ID] Interval Transfer Bitrate Retr
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[ 5] 0.00-10.04 sec 84.7 MBytes 70.7 Mbits/sec 143 sender
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[ 5] 0.00-10.00 sec 83.3 MBytes 69.9 Mbits/sec receiver
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Upload
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Connecting to host 10.83.44.2, port 5201
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[ 5] local 10.83.47.127 port 38846 connected to 10.83.44.2 port 5201
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[ ID] Interval Transfer Bitrate Retr Cwnd
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[ 5] 0.00-1.00 sec 4.22 MBytes 35.4 Mbits/sec 41 45.6 KBytes
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[ 5] 1.00-2.00 sec 3.92 MBytes 32.9 Mbits/sec 3 52.8 KBytes
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[ 5] 2.00-3.00 sec 2.45 MBytes 20.5 Mbits/sec 3 64.2 KBytes
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[ 5] 3.00-4.00 sec 1.47 MBytes 12.3 Mbits/sec 1 58.5 KBytes
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[ 5] 4.00-5.00 sec 2.70 MBytes 22.6 Mbits/sec 5 52.8 KBytes
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[ 5] 5.00-6.00 sec 3.92 MBytes 32.9 Mbits/sec 7 61.3 KBytes
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[ 5] 6.00-7.00 sec 3.68 MBytes 30.8 Mbits/sec 9 45.6 KBytes
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[ 5] 7.00-8.00 sec 3.92 MBytes 32.9 Mbits/sec 10 51.3 KBytes
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[ 5] 8.00-9.00 sec 3.92 MBytes 32.9 Mbits/sec 2 61.3 KBytes
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[ 5] 9.00-10.00 sec 3.86 MBytes 32.4 Mbits/sec 4 55.6 KBytes
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- - - - - - - - - - - - - - - - - - - - - - - - -
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[ ID] Interval Transfer Bitrate Retr
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[ 5] 0.00-10.00 sec 34.1 MBytes 28.6 Mbits/sec 85 sender
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[ 5] 0.00-10.05 sec 33.6 MBytes 28.1 Mbits/sec receiver
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Via fastd
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Download
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Connecting to host 10.83.44.2, port 5201
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Reverse mode, remote host 10.83.44.2 is sending
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[ 5] local 10.83.47.127 port 42080 connected to 10.83.44.2 port 5201
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[ ID] Interval Transfer Bitrate
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[ 5] 0.00-1.00 sec 1.61 MBytes 13.5 Mbits/sec
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[ 5] 1.00-2.00 sec 1.78 MBytes 15.0 Mbits/sec
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[ 5] 2.00-3.00 sec 1.74 MBytes 14.6 Mbits/sec
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[ 5] 3.00-4.00 sec 1.80 MBytes 15.1 Mbits/sec
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[ 5] 4.00-5.00 sec 1.80 MBytes 15.1 Mbits/sec
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[ 5] 5.00-6.00 sec 1.77 MBytes 14.8 Mbits/sec
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[ 5] 6.00-7.00 sec 1.81 MBytes 15.2 Mbits/sec
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[ 5] 7.00-8.00 sec 1.79 MBytes 15.0 Mbits/sec
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[ 5] 8.00-9.00 sec 1.78 MBytes 15.0 Mbits/sec
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[ 5] 9.00-10.00 sec 1.80 MBytes 15.1 Mbits/sec
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- - - - - - - - - - - - - - - - - - - - - - - - -
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[ ID] Interval Transfer Bitrate Retr
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[ 5] 0.00-10.04 sec 17.9 MBytes 15.0 Mbits/sec 26 sender
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[ 5] 0.00-10.00 sec 17.7 MBytes 14.8 Mbits/sec receiver
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Uplad
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Connecting to host 10.83.44.2, port 5201
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[ 5] local 10.83.47.127 port 51834 connected to 10.83.44.2 port 5201
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[ ID] Interval Transfer Bitrate Retr Cwnd
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[ 5] 0.00-1.00 sec 1.94 MBytes 16.2 Mbits/sec 0 130 KBytes
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[ 5] 1.00-2.00 sec 1.72 MBytes 14.4 Mbits/sec 0 205 KBytes
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[ 5] 2.00-3.00 sec 1.96 MBytes 16.4 Mbits/sec 0 279 KBytes
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[ 5] 3.00-4.00 sec 1.90 MBytes 15.9 Mbits/sec 0 355 KBytes
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[ 5] 4.00-5.00 sec 1.53 MBytes 12.8 Mbits/sec 0 429 KBytes
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[ 5] 5.00-6.00 sec 1.84 MBytes 15.4 Mbits/sec 0 505 KBytes
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[ 5] 6.00-7.00 sec 2.08 MBytes 17.5 Mbits/sec 0 542 KBytes
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[ 5] 7.00-8.00 sec 1.04 MBytes 8.73 Mbits/sec 0 542 KBytes
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[ 5] 8.00-9.00 sec 1.04 MBytes 8.73 Mbits/sec 0 542 KBytes
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[ 5] 9.00-10.00 sec 1.04 MBytes 8.74 Mbits/sec 1 542 KBytes
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- - - - - - - - - - - - - - - - - - - - - - - - -
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[ ID] Interval Transfer Bitrate Retr
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[ 5] 0.00-10.00 sec 16.1 MBytes 13.5 Mbits/sec 1 sender
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[ 5] 0.00-11.74 sec 14.2 MBytes 10.2 Mbits/sec receiver
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