[Bluez-users] LAN over bluetooth connection hangs

[Bluez-users] LAN over bluetooth connection hangs

[Łukasz Hejnak]

Hi
I've got a problem with the LAN over bluetooth functionality.
I've got two bluetooth usb dongles and two linux machines, one of which =

is connected to the internet. The idea was simply to connect the second =

machine via bluetooth to the internet.
The basic instructions that I found at =

http://fedoranews.org/contributors/muhammad_al_ismail/bluetooth/
work... but not exactly.

I mean I get the connection established, the firewall is set up, icmp =

packets are passing ok, but when I try getting anything else over the =

connection (like when I fire up my browser, or even connect via ssh and =

do some stuff that needs more bandwidth, display dmesg for example) it =

stalls. Nothing else can get trough (not even ICMP). Everything else =

seems in order:
link quality is 255, the connection according to hcitool is established, =

bnep0 devices are visible on both ends, but what I get in the logs of =

the client machine is:
hci_acldata_packet: hci0 ACL packet for unknown connection handle 266

The valid connection handle as displayed by `hcitool con` is 1
Can anybody help me?
Is this a (cheap) hardware problem or maybe just some misconfiguration?
The dongles are the ever so popular BlueSoleil.

-- =

Pozdrawiam
=A3ukasz 'Szift' Hejnak
jid: Szift@jabster.pl
email: Lukasz@Hejnak.pl

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Re: [Bluez-users] LAN over bluetooth connection hangs [SOLVED]

[Łukasz Hejnak]

Hi
[for the impatient, scroll half way down for the solution - look for a =

'whoa']

Thought I'll update this thread with some info I gathered today.
First off, I'm using bluez version 3.22
I read the http://bluez.sourceforge.net/contrib/HOWTO-PAN and redone my =

configuration according to the second example, the effect is exactly the =

same: the connection get's established, I can send ICMP packets as well =

as small portions of information (like establishing an ssh session) and =

this works well. I left the ping working for an hour and everything =

worked ok.
BUT the minute I try to send/receive a bigger chunk of data (like load a =

webpage or do `dmesg` on my ssh terminal) the connection freezes.
Everything seems to be in order, `pand -l` shows the connection, =

`hcitool scan` shows the other interface, `hcidump -i hci0` shows no =

disruption at all. The packets are still flying back and forth, but icmp =

packets stop arriving, and everything else freezes as well.
`ifconfig bnep0` shows no errors/dropped/overruns/collisions etc.
MTU is set to 1500...

*whoa* here we go, just tried to set the mtu to something smaller like =

1000 and there it went.. for a moment longer - I managed to load up a =

page in lynx.. it worked for a while and then froze again
then I reduced the mtu on both sides to 500 and it works now
Just added `ifconfig bnep0 mtu 500` to both bnep0 init scripts (-u pand =

option) and it's done.
Strange though, none of the docs/how-to's I came across mention anything =

about changing the bnep0 interfaces mtu, but I'd shoot it's because of =

the damned cheap bluetooth dongles.
Anyway it works great & fast now. We'll see for how long.

-- =

Best Wishes
=A3ukasz 'Szift' Hejnak
jid: Szift@jabster.pl
email: Lukasz@Hejnak.pl

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