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Contents 1 More Info 2 Topology 3 6Mesh 3.1 Easy way to 5 ghz - Meshing at congress: 3.2 Next steps: 3.3 problems

[edit] More Info

http://wiki.freifunk.net/6mesh.freifunk.net

[edit] Topology

For topology, see http://quamquam.org/~jow/6mesh.png - image is refreshed every 5 minutes. OLSR state can be found at http://81.163.28.204/topo.txt

[edit] 6Mesh

• runs olsrd
• uses fdca:ffee:babe:dada::/64 for mesh: http://www.sixxs.net/tools/grh/ula/list/
• uses rfc 2765 for transporting v4 throught v6: http://blogs.k-ita.de/~alx/?p=91
• kernel module for kernel 2.6 untested right now, please test: http://blogs.k-ita.de/~alx/?p=115
• ff-leipzig will build a 25c3 firmware, coming soon:
• We encounter a typical probe storm on site. Please apply this patch to your madwifi source tree:

http://nbd.name/500-probereq.patch

• A complete madwifi tree can be found here:

http://download-master.berlin.freifunk.net/sven-ola/binaries/

• Typical config to be added in /etc/network/interfaces and activated using "ifup vap0" is:

iface vap0 inet static
        address 104.198.65.66
        netmask 255.0.0.0
        broadcast 104.255.255.255
        wireless_mode ad-hoc
        wireless_key off
        wireless_rts off
        wireless_fraq off
        wireless_channel 1
        wireless_ap 02:25:C3:CA:FF:EE
        wireless_essid 6mesh.freifunk.net
        up sh -c "ip addr add dev $IFACE 172.16.0.3/16"
        up sh -c "echo 'nameserver 81.169.139.12\nnameserver 212.91.230.58'>/etc/resolv.conf"
        up sh -c "iwpriv $IFACE doth 0;iwpriv $IFACE uapsd 0;iwpriv $IFACE bgscan 0;iwpriv $IFACE ap_bridge 0;iwpriv $IFACE rssi11b 11;iwpriv $IFACE rssi11g 11;iwpriv $IFACE rssi11a 11;iwpriv $IFACE mcast_rate 5500;iwpriv $IFACE bintval 1000;iwpriv $IFACE probereq 0"
        pre-up sh -c "for if in ath0 vap0 vap1 vap2 vap3;do if grep -q \$if: /proc/net/dev;then ip link set dev \$if down;wlanconfig \$if destroy;fi;done;wlanconfig $IFACE create wlandev wifi0 wlanmode ad-hoc nosbeacon>/dev/null"
        post-down sh -c "grep -q $IFACE: /proc/net/dev && wlanconfig $IFACE destroy;exit 1"

Wireless 6Mesh Channel 1 und Channel100 ( 5ghz )

Konfiguration der ipv6 nodes: Wireless:ipv6-config
Ips fuer den SIIT Asistenten: Wireless:IPs

Download der Firmware ( beta )
http://dev.luci.freifunk-halle.net/siit-snapshots/x86/

[edit] Easy way to 5 ghz - Meshing at congress:

-> console -> edit in /etc/modules.d/50-madwifi

 ath_pci 

in

 ath_pci outdoor=1 countrycode=276 

, then reboot.

now change on luci - adminpage the wireles settings to channel 100 / bssid 05:25:c3:ca:ff:ee -> reboot -> fun!

[edit] Next steps:

some guys of Freifunk will set up a Developer-Mesh-Network for Testing. visit here or here, both only (de)

[edit] problems

• Dec 29 02:50:39 siit-77-87-52-145 user.info kernel: NETDEV WATCHDOG: wifi0: transmit timed out
• ICMP6 nach ICMP4 Translation nicht einwandfrei, daher funktioniert PMTU-D nicht, händische MTU Abstimmung als Workaround noch notwendig
• Ugly implementation in Olsrd. aaron fixed some things last night.