Re: [Bluez-users] how get differenced two simultaneous bnep interfaces with the same IP address in a single Bluetooth dongle?

[Marcel Holtmann <marcel@holtmann.org>]

Hi Esteban,

>     I am working with a single USB dongle in a Linux laptop with BlueZ 
> and two PAN-profile access points connected to the same LAN. Each access 
> point is implemented with a PC with bridge-utils and bluez packets 
> installed. I stablish two simultaneous PAN connectionsfrom the laptop: 
> each one to a different access point. Having both connections would 
> prevent the loss of data between the LAN and the laptop. I would like to 
> receive all the packets through both connections, in order to have 
> redundancy.

this sound like a job for the Netfilter.

>     I configure both resulting bnep interfaces to have the same IP 
> address, since I don't want the other side of the communication to know 
> the existence of two different paths. When I do "ifconfig" in the  
> laptop, I realize that both bnep interfaces show the same hardware 
> address, which would let my laptop receive each packet from the LAN 
> twice. But the reality is that only one of the interfaces at a time 
> receives the packets.

The hardware of every BNEP virtual network card is taken from the
BD_ADDR of the local dongle. However how do you expect that using the
same IP address should work anyway. The bnepX devices are a virtual
network and they react the same like ethX.

>     I would like to know if this issue depends on the bnep 
> implementation and also would like to know how can the net make 
> differences between both interfaces, as they have same MAC and IP addresses.

This is not a BNEP issue, because it is only sending/receiving what the
network subsystem tolds it. Ask the Linux network guys for this kind of
specific thing you wanna do.

Regards

Marcel




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