B.A.T.M.A.N

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4255 discussions

[B.A.T.M.A.N.] batman routing clarification
by Stefano Scipioni 20 Sep '07

20 Sep '07

I am switching a 20 mesh node from olsrd but I have some problem in routing. I have no gateway node because I use openvpn to have a tunnel with PC. All nodes have: batman -g 0 -r 3 -o 3000 <interface> node C has: batman -g 0 -r 3 -o 3000 -a 10.0.0.0/24 <interface> I have several case like this: A----good----B----good-----C-----10.0.0.0/24----PC \---------------poor-------------/ three node can communicate with all others but radio link from A to C is poor. When node A want to communicate to node C it goes directly to C because batman calculate a direct route to it. But if I manually set routes to use node B connection from A to C is good. What is my mistake? -r parameter in batmand daemon works only in searching gateway node? ...or it works every time, also with normal node?

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Re: [B.A.T.M.A.N.] batman routing clarification
by elektra 19 Sep '07

19 Sep '07

Thanks! One thing that just came to my mind: when you used -o 3000 it takes very long to fill the sliding window size of OGM statistics. A sliding window size of 128 will take 384 seconds to fill up - more than 6 minutes! So if you just fire up the daemon and quickly start your measurements, the routing results can be quite arbitrary since there are not enough packets to make a reasonable decision. But it might very well be the case that the broadcasts of the stretched link are propagating too far. In this case there is a workaround: You can increase the broadcast datarate if your wireless drivers/cards support this feature. This way you will decrease the range of OGM broadcasts. This has proven to be a good solution for mesh networks using OLSR at Freifunk. Batman-0.2 still has some flaws in the routing metrics. The routing algorithm works nicely, but the metrics are sometimes unfortunate (choosing routes with bad performance in transmit direction, rumors saying it is preferring routes with small hopcount too much.) We are addressing this with 0.3 and in the experimental branch of batmand. Also it could indicate a problem with the wireless devices. cu elektra > 2007/9/19, elektra <onelektra(a)gmx.net>: > > Hi - > > > > which version of batman are you using? And you should provide us with > > more > > batman 0.2 > > > details. Just saying Link is 'poor' or 'good' is very unprecise. Remember: > A > > > direct route with 6 Megabit performs similar to a two-hop link with 12 > > Megabits on each link, since no retransmissions have to be made. > > poor respectly to radio signal, A to C without B give 100kbit/s unstable > > If you set the routes manually, it would be interesting to know the > transfer > > > performance of the following: > > A->C: 100kbit > > > A->B: full > > A->B->C: 1000kbit > > C->A: 100kbi > > C->B: 2500kbit > > C->B->A: 1000kbit > > > > > > How many OGMs does A count directly from C and via B? (And vice versa) > > By the way: -o 3000 is quite slow for sending Originator messages if you > > have > > 20 nodes only. The default should be fine. > > Ok, I removed -o 3000 and changed antenna in A node (less sensitive to node > C). > Now default route for A is B, that it is correct. > > > > I am switching a 20 mesh node from olsrd but I have some problem in > > > routing. I have no gateway node because I use openvpn to have a tunnel > > > > with > > > > > PC. All nodes have: > > > batman -g 0 -r 3 -o 3000 <interface> > > > > > > node C has: > > > batman -g 0 -r 3 -o 3000 -a 10.0.0.0/24 <interface> > > > > > > I have several case like this: > > > > > > A----good----B----good-----C-----10.0.0.0/24----PC > > > \---------------poor-------------/ > > > > > > three node can communicate with all others but radio link from A to C > > > is poor. > > > > > > When node A want to communicate to node C it goes directly to C because > > > batman calculate a direct route to it. > > > But if I manually set routes to use node B connection from A to C is > > > > good. > > > > > What is my mistake? > > > > > > -r parameter in batmand daemon works only in searching gateway node? > > > > ...or > > > > > it works every time, also with normal node?

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[B.A.T.M.A.N.] batman experience at wireless community weekend Graz 2007
by Axel Neumann 18 Sep '07

18 Sep '07

Hi, the wonderful people from graz.funkfeuer.at are simply the fastest in terms of realtime documentation of ongoing experiments. see: https://wiki.graz.funkfeuer.at/BatmanTestbed and particularly the smooth handover experiment when walking through the exhibition side (furnished with 20 mesh-routers) with an OLPC running batman (with a window size (NBRF) of 5 and an originator interval of 2 seconds). The ping -R indicates the route changes, the life audio stream, does not stop until getting outside the building into kind of blind spot. ciao, axel

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[B.A.T.M.A.N.] WRT54G Wireless Mode setup questions.
by karl＠skytecmail.com 15 Sep '07

15 Sep '07

Hello everyone!, I have a couple of question, and excuse me if they has been previously answered, but I can't find any straight answer. If I run "batmand" on a WRT54G, either running OpenWRT, Tomato, DD-WRT or similar firmware, what is the correct mode to set up the router? That is, do I leave it in AP mode, Repeater mode (as in the case of DD-WRT) or what mode? I still don't have clear how the routers talk/find each other. And then, how do you set up DHCP server on them? On one gateway?, meaning that it will supply addresses to all clients, or on each gateway? I assume there has to be a single DHCP server on the mesh (obviously!), but where? Please point me to some references as to how to set up on an existing WRT54G. I have already installed "batmand" on a WRT54G (v6) running DD-WRT (micro) and it runs!, but my setup will be on one master router WRT54GS V1, currently running Tomato VPN build that has tun driver) that will be my Internet gateway, and two WRT's running DD-WRT micro as satellites for the mesh. I'm confused, so I need a little guidance here :) Also, if I can use anything else other than DD-WRT firmware on the WRT54G V6's I have, please let me know. What I have available on hand is (1) WRT54G V1 and (2) WRT54G V6, so that's what I have to work with. Thanks!, -Karl

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[B.A.T.M.A.N.] B.A.T.M.A.N Talk and Workshop at WCW 07 in Graz/Austria
by Axel Neumann 14 Sep '07

14 Sep '07

Hello, just to forward this announcement from: http://open-mesh.net/news ciao, axel. B.A.T.M.A.N Talk and Workshop at wireless community weekend 07 in Graz/Austria At the wireless community weekend 07 in Graz / Austria will be an open presentation, discussions and workshops covering the current state of the B.A.T.M.A.N mesh routing protocol. There will be a general introduction into the protocol mechanisms and its capabilities during the mesh routing-protocols slot at Saturday, September 15th at 5 pm. We have also setup an experimental mesh network at the exhibition area with about 20 nodes running OLSR (0.5.4pre) and BATMAN (batman-0.2 and batman-experimental) in parallel. On Sunday, September 16th (as well as anytime between) will be time for real-live experience during the hands-on workshops at 2 pm. The event will take place at the Kunsthaus Graz in the city center. See http://wiki.graz.funkfeuer.at/WirelessCommunityWeekend for further details.

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[B.A.T.M.A.N.] translation of batman-adv
by 唐鼎 14 Sep '07

14 Sep '07

hi! Dose the translation of batman-adv support fast roaming between batman nodes(every batman node has two wireless interface under a bridge,one works in ap mode,another works in adhoc mode for batman' routing)

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[B.A.T.M.A.N.] something about 0.3
by a.anselmi＠oltrelinux.com 06 Sep '07

06 Sep '07

I've downloaded and installed the 0.3 current for fonera-kamikaze platform and it seems work fine in a robin mesh cloud... but I've a problem which I don't well undestand. When batmand starts it ask me for a /dev/batman (a modul kernel) which would improve performance. I never read before about /dev/batman, so, anyone can suggest where I can find more documentation? I believe that the originator messages compatibility number was been incremented in o.3 because a node running 0.2 doesn't see OGMs coming from batman o.3 nodes... is this correct? Thanks -- Antonio

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[B.A.T.M.A.N.] Multiple connections / prioritiy
by Freifunk Dresden 03 Sep '07

03 Sep '07

Hi Axel, this is great and I will try it, but I can not promise to give you results soon because the lack of time. If I have multiple connections between two nodes, is there a way to setup the quality or priority of those connection? Assume I have tree or more nodes connected in a line (A,B,C,D) and node A and Node D are connected via backbone tunnel over Internet, the wireless connection should be used until the quality falls below a certain level or the number of nodes exceeded a maximum value. setting up a hysteresis should be possible to avoid to much switching of the route. eth1: A ------- B ------- C ------- D bbs: A ============================D Regards Stephan

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[B.A.T.M.A.N.] Hops along the way
by Axel Neumann 27 Aug '07

27 Aug '07

Hello, On Sonntag 26 August 2007, Michael Burmeister-Brown wrote: > Regarding finding gateways: > > What I meant was, is there a way for a repeater node to find the current > route being used from the node to the Gateway? You can use tools like traceroute or ping -R. But you must use the ip of the currently selected GW node as the target address. You can get the currently selected GW-node with batmand -c -d 2 -b. This debugoutput level 2 shows the currently available GWs and the currently selected GW. It'll look like: $ batmand -c -d 2 -b Gateway Router (#/128) => 10.1.0.1 10.1.0.1 ( 31), gw_class 2 - 64 KBit (e.g. ISDN), reliability: 0 10.2.0.1 10.1.0.1 ( 30), gw_class 2 - 64 KBit (e.g. ISDN), reliability: 0 Note that 10.1.0.1 and 10.2.0.1 is actually one machine with two interfaces. And 10.1.1.1 and 10.2.1.1 is another machine with two interfaces. Note also that ping and traceroute are sometimes confusing when tracing a node with multiple IPs. Then any of the valid IPs on that machine may be returned as the traced hop. So there are two gateways avilable and 10.1.0.1 is the currently selected one. The following examples have been executed on node 10.1.1.2 $ ping -R 10.1.0.1 # shows the first 10 hops from source to destination and back PING 10.1.0.1 (10.1.0.1) 56(124) bytes of data. 64 bytes from 10.1.0.1: icmp_seq=1 ttl=64 time=19.1 ms RR: 10.1.1.2 10.2.1.1 10.1.0.1 10.1.0.1 10.1.1.1 10.1.1.2 $ traceroute 10.1.0.1 # shows only the intermediate hops from source to destination traceroute to 10.1.0.1 (10.1.0.1), 30 hops max, 40 byte packets 1 10.1.1.1 (10.1.1.1) 5.103 ms 3.608 ms 3.870 ms 2 10.1.0.1 (10.1.0.1) 7.762 ms 8.640 ms 7.650 ms ( If you do not have ping or traceroute available or do not have it compiled with the desired options (like -R for ping) for your hardware you can try the pre-compiled binaries at: http://downloads.open-mesh.net/misc/handy-tools/ ) > > It would be nice to be able to see how many hops are being used, the > quality of each link along the way, etc. Our Google maps (for Merakis) > will also highlight the route to the gateway, for example. To get detailed feedback about the quality of each individual hop you may install a central visualization server using the vis tool: svn co https://dev.open-mesh.net/batman/browser/trunk/vis/ Then each node must be configured to send information about the link qualities to its neighbors to the centralized server. ( There is no global knowledge at every node about every link , thats one of the big differences between batman and link-state-protocols ) Therefore simply start the client nodes with eg.: batmand -s <IP-of-central-visualization-server> wlan0 ciao, axel > > Thanks again, > > Mike >

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[B.A.T.M.A.N.] robin
by a.anselmi＠oltrelinux.com 25 Aug '07

25 Aug '07

Hi, I'm using BATMAN routing algorithm on an kamikaze based firwmare, realizing ROBIN (Routing Batman Inside) MESH: a 0-config, QoS capable mesh software which targets Atheros AP51 devices such as Meraki Mini or Fonera. As soon as flashed, mini-routers act as mesh-network appliances: all you need is power-on the devices and connect almost one of these to a xDSL DHCP capable router; users in the mesh cloud can associate with mesh nodes APs (open and WPA-PSK protected ones) and start browsing. ROBIN comes also with a precofigured NoDogSplash release offering firewalling and throttling. If you want test the ROBIN download it (images and docs) from: http://sourceforge.net/projects/ponte2/ the tarball contains the kernel (vmlinux.gz .lzma) and the root filesystem (jffs2-64k) needed for flashing Meraki Mini and Fonera. Many thanks to all for suggestions, reports and bug divering! -- Antonio a.anselmi(at)oltrelinux(dot)com www.blogin.it

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