[Olsr-users] (no subject)

[Vigneswaran R]

On 10/31/2014 11:19 AM, akshay mithyantha wrote:
> Hello,
>
> A project I've been working on requires data to be sent on multihop 
> network.
>
> I've used 3 DELL laptops which has Broadcom BCM4365 wireless hybrid 
> adapter and a Linksys WRT 54GL router. The devices are running OLSR 
> 0.6.7. As the loss was very high when the devices were kept afar, I've 
> put the devices in the same room.
>
> Consider device A, B, C to be the laptops and device D to be the router.
> Currently all devices can communicate with each other.
>
> Now as I wanted the devices to communicate only to its immediate 
> neighbor, I manually blocked the 2nd hop and 3rd hop neighbors using 
> the following command.
>    sudo iptables -A INPUT -m mac --mac-source <mac id> -j DROP
>
> The device A can send data only to B blocking C and D, B can send data 
> to A and C but blocked D, C can send data to B and D, but blocked A 
> and D can send data to C but blocked A and B.
>
> The topology being
>      A <-----> B <-----> C <-----> D
>
> An example of the current routing table of A after manually blocking 
> of other neighbors is
>   1st hop       2nd hop
>      B                 C
>
> The device A can ping its 2nd hop neighbor device C through B.
>
> But the device B cannot ping its 2nd hop neighbor router D.
> The device A cannot pass data to 3rd hop neighbor router D.
> The router can ping only its immediate neighbor C.
>
> Is this problem due to incompatibility of network adapters of laptop 
> and the router? Should I replace the laptops with the routers or is 
> there any other issue that I don't know of?

To ensure that your network configuration is correct, do the following:-

On A:
1. manually add route to C via B
2. manually add route to D via B

On B:

1. enable ip_forward
2. manually add route to D via C

On C:

1. enable ip_forward
2. manually add route to A via B

On D:
1. manually add route to A via C
2. manually add route to B via C

Now, you should be able to ping end to end (A ==> D, D ==> A).

If that happens, there is no problem with your network adapters and 
configuration.

Regards,
Vignesh

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.olsr.org/pipermail/olsr-users/attachments/20141031/ee71d442/attachment.html>