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

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

[Esteban Monturus]

    Hi all.

    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.

    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.

    For example, when "ping" my laptop from a computer connected to the 
LAN, only bnep0 receives ICMP requests, and bnep1 doesn't. If I use the 
metrics of the routing table to force bnep1 to answer the ping, then 
ICMP requests start to be received by bnep1, and bnep0 receives nothing now.

    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.

    Thanks a lot.


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

[Alfredo Meraz]

Hi Esteban:
This doesn't seem like a bluetooth problem to me,
rather a network problem. And the root, as it appears
to me, is that at some point you will have to
dupplicate the network packets so that they go through
both access points :) ... and manage your routing
table acordingly... and some more tweakings :S
I had a simpler problem a few months back, when I
inserted 2 NIC's of the same brand into a
server-router. The second NIC, even when configured
properly, would not receive packets at all! Using a
network sniffer, ethereal, I found out that packets
would leave the second NIC, with the right IP address,
but with the MAC address of the first NIC!
The solution? I had to use a second NIC of a different
brand, and now it works :D
Regards.
Alfredo

 --- Esteban Monturus <emonturus@teltronic.es>
escribió: 
>     Hi all.
> 
>     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.
> 
>     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.
> 
>     For example, when "ping" my laptop from a
> computer connected to the 
> LAN, only bnep0 receives ICMP requests, and bnep1
> doesn't. If I use the 
> metrics of the routing table to force bnep1 to
> answer the ping, then 
> ICMP requests start to be received by bnep1, and
> bnep0 receives nothing now.
> 
>     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.
> 
>     Thanks a lot.
> 
> 
>
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Re: [Bluez-users] how get differenced two simultaneous bnep interfaces with the same IP address in a single Bluetooth dongle?

[Marcel Holtmann]

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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