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Date: Thu, 12 Mar 2009 23:46:40 +1300
From: David Sainty <dave@dtsp.co.nz>
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To: yesir yao <yesiryao@gmail.com>
CC: linux-bluetooth@vger.kernel.org
Subject: Re: dund: how to config for handset platform
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yesir yao wrote:
>>> after I run "dund --listen --dialup --msdun --nodetach"
>>>       
>> I'm afraid dund is obsolete in Bluez 4. I think the right way to do it
>> is to use rfcomm to create a serial device like /dev/rfcomm0 and use
>> pppd to dial-up through that.
>>     
>
>
> I think, It is on the Data terminal side, not for the Gateway side.
> the profile looks like:
> pc (Data terminal : run pppd and dial to /dev/rfcomm0 )
> --> handset (Gateway : with bluetooth chip and modem on tty)
> --> gsm (gprs) --> net
>
> now, i want to run "dund --dialup --msdun" on handset,
> and receive ppp packet from pc, then send those to modem(ttyS1).
>   

I do essentially the following to provide IP connectivity over bluetooth
to my Palm:

: ${rfdevice:=rfcomm0}
sysctl -w net.ipv4.ip_forward=1
sdptool add --channel=1 SP
rfcomm --encrypt watch "$rfdevice" 1 pppd '{}'
"${localIP}:${bluetoothIP}" local nodetach noauth proxyarp $dns

This is with a recent BlueZ 4.x rfcomm.  I'm using an old kernel, which
has terrible bugs that are hopefully resolved in newer kernels (if I
disconnect from the Palm end before the Linux end, rfcomm seg faults
[might be a user level bug there] and I need to reboot in order to be
able to reconnect again).