[Olsr-users] Broadcast Packets & Windows Routing

[Erik Tromp]

Hello Justin,
 
Broadcast packets are by default not forwarded by the OLSR daemon. For that, you need the BMF plugin. It comes standard
with OLSR but you have to enable it in the configuration file.
 
In the unpacked OSLR directory structure, cd to lib/bmf and read README_BMF.txt for more information. For basic
operation, including the forwarding of broadcast packets, add the following lines to your olsrd.conf file:
 
LoadPlugin "olsrd_bmf.so.1.5.2"
{
}
 
Between the curly braces you might want to add the routers' network interfaces into the local LAN (the interfaces of
which you are advertising the IP subnets as HNA). Let's say your Hna4 section of your config file looks like this:
 
Hna4
{
   192.168.2.0  255.255.255.0
   192.168.3.0  255.255.255.0
}

Suppose the IP subnet 192.168.2.0  255.255.255.0 is on eth2 and 192.168.3.0  255.255.255.0 is on eth3. Then the BMF
should be configured like this:
 
LoadPlugin "olsrd_bmf.so.1.5.2"
{
    PlParam     "NonOlsrIf"  "eth2"
    PlParam     "NonOlsrIf"  "eth3"
}
 
BMF works nice with the broadcast-based flavour of NetBIOS over TCP/IP. Just run the BMF-enabled OLSR daemon in all your
routers and your windows machines will see each other - I've seen it working :-) BMF will translate the IP-broadcast
addresses inside the IP packets to cater for the different IP subnets you have inside, or connected to, your ad-hoc
network.
 
Note that the BMF plugin is only available on Linux; you will not be able to use BMF on a Windows-based (OLSR) router.
But of course, running on a Linux-based router, BMF will forward the broadcast packets generated by Windows computers.
 
Regards,
Erik
 
 


  _____  

Van: (spam-protected) [mailto:(spam-protected)] Namens Justin Krohn
Verzonden: donderdag 21 februari 2008 19:53
Aan: (spam-protected)
Onderwerp: [Olsr-users] Broadcast Packets & Windows Routing


Hello,

  I have to questions that I have not been able to find an answer for.  I am attempting to use Freifunk based routers
(running OLSR) to create a mobile, ad-hoc vehicular network.  I am planning on writing an application to run on the
routers, but am concerned about how to figure out what other systems running the software are around.  Typically on LANs
and WLANs I would just send out a broadcast packet to a waiting piece of software on another computer which would
respond with information on what services the system was running, but thus far all of my broadcasts have been filtered
by the OLSR daemon.  Is there a specific type of broadcast packet/method to get a broadcast message out to all
nodes/clients?
  Also, I have been doing some testing with the Windows OLSR daemon available at
http://download.berlin.freifunk.net/sven-ola/binaries/ , and while using it I have been able to easily
connect/communicate with the various nodes in the mesh network, the computer does not act as a multi-hop node, meaning
that while it will connect across multiple nodes to communicate with other nodes, it does not allow other nodes to use
it to communicate with other nodes.
  I am a relative newbie to OLSR, so if these questions are exceedingly simple/stupid I apologize, and would appreciate
any help the mailing list can give. Thanks,

Justin


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