[Olsr-users] Subnet settings of NICs and mobility

[Henning Rogge]

On 09/24/2012 11:59 AM, Vigneswaran R wrote:
> On Monday 24 September 2012 02:51 PM, Henning Rogge wrote:
> [...]
>>> You mean all the NICs of a single machine should be in different subnets
>>> for OLSR to establish routes properly, right?
>>
>> They should have different subnets to make the IP stack work properly.
>> Using the same subnet for all interfaces/NICs is a problem with and
>> without OLSRd.
>
> Ok.
>
>>> In that case, while connecting two machines, if the NICs being part of
>>> the link have different subnet settings, will OLSR establish route?
>>> (assume that this connection happened due to node movement).
>>
>> A group of NICs which might have a connection should share a subnet.
>
> I agree. However, in a scenario where nodes are *mobile* and have
> (multiple) *point to point radio* devices (with directional antennas)
> for communication between them, is it possible for the following to occur?
>
> (Note: I don't have much idea about the radio devices).
>
> +-----------------+        +-----------------+
> |eth0: 10.1.1.1/16|        |eth1: 10.2.1.2/16|
> |                 |        |                 |
> |      Node1      |        |      Node2      |
> |                 |        |                 |
> |eth1: 10.2.1.1/16|<------>|eth0: 10.1.1.2/16|
> +-----------------+        +-----------------+
>
> If yes, are there any workarounds? Thank you.

It might work with OLSRd because the routing protocol sets up 
host-routes for each target, but its trouble for testing (because it 
will not work correctly without the routing protocol).

If you control the whole mesh/network, I would suggest use one subnet 
for each wifi-channel you are using.

If you cannot do this, try to make sure that you use different subnets 
for the ethernets and the wifi-mesh.

Henning Rogge

> Regards,
> Vignesh
>
>
>


-- 
Diplom-Informatiker Henning Rogge , Fraunhofer-Institut für
Kommunikation, Informationsverarbeitung und Ergonomie FKIE
Kommunikationssysteme (KOM)
Fraunhofer Straße 20, 53343 Wachtberg, Germany
Telefon +49 228 9435-961,   Fax +49 228 9435 685
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