ad-hoc mode issues

[botik32]

There seem to be issues with ad-hoc mode (short version: it did not work on my gentoo machine). is ad-hoc mode supported by this driver?

long version:

after iwconfig wlan0 essid daihinia mode ad-hoc on two machines with tl-wn723n I get this:

machine 1:

Mode:Ad-Hoc Frequency:2.412 Ghz Cell: 02:11:87:C6:B2:FE
Link Quality:0 Signal level:0 Noise level:0

machine 2:

Mode:Ad-Hoc Frequency:2.412 Ghz Cell: 02:11:87:6A:20:FF
Link Quality:0 Signal level:0 Noise level:0

Then there is no way I can get them to be in the same cell, and ping does not work between them (after setting them to the same network with ifconfig)

possibly related, I get this in the log:

[45541.999446] Chip Version Info: CHIP_8188E_Normal_Chip_TSMC_A_CUT_1T1R_RomVer(0)
[45542.032799] usbcore: registered new interface driver rtl8188eu
[45542.540705] MAC Address = f8:1a:67:26:34:0e
[45542.557066] RTL8188: ERROR indicate disassoc

I can provide more details if needed.
Thanks.
Alex.

[botik32]

See latest 3 posts in the thread below, someone else seems to be experiencing the same issues. They said they got other cards that use 8192cu working properly:

http://www.raspberrypi.org/phpBB3/viewtopic.php?t=49870&p=387391

[sergforce]

I can confirm that 2 rtl8188eu devices doesn't work in ad-hoc mode with each other. I used TP-LINK 723N and DLink DWA-125 Rev D1. But if I use a rtl8188eu device in ad-hoc mode on one side and BCM4321 (PCIe card) on the other it works, but rtl8188eu should be configured last. If rtl8188eu is configured first and then BCM4321 is configured in ad-hoc latter they doesn't see each other.

More interesting I set 3 machines in ad-hoc mode (in the same network):
A: BCM4321 (10.0.0.1)
B: TP-LINK 723N (10.0.0.2)
C: DLink DWA-125 Rev D1 (10.0.0.3)

in 3 machines configuration on (B) and (C) I get ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready (it never become ready on 2 machines rtl8188eu to rtl8188eu ad-hoc link)

(A) can see both (B) and (C)
(B) sees only (A) if I start pinging (C) it never replies
(C) sees only (A) if I start pinging (B) it never replies

Do you have any idea of what it could be? I can do more testing if you tell me what to test

[botik32]

Yeah, same here, got it connecting to an existing ad-hoc network (used broadcom too). But if there is no ad-hoc network to connect to, then it is impossible to initiate the ad-hoc network from a rtl8188eu.

[botik32]

To confirm, the same behaviour of both rtl cards seeing the third one, not each other, and the other one sees both.

[lwfinger]

I seldom use ad-hoc mode, and it will be some time before I would be able to work on this problem.

It would be helpful if you set up wireshark on a third computer to capture the over-the-air traffic. You need to capture the working case when the non-8188eu device is started first, and the non-working case when the 8188eu unit is started before the BCM4321.

Which driver are you using on the 4321?

[botik32]

I also tried intel centrino on my laptop, same story with ad-hoc and cards not seeing each other but seeing the centrino one. Driver is iwlwifi.

[botik32]

The broadcom was on ARM (driver is bcm40181)

[botik32]

I believe I could get you the tcpdump for both cases. Please stay tuned.
Thanks,
Alex.

[lwfinger]

The tcpdump output will likely not be sufficient. It only sees what makes it through the driver. Any discarded packets are not seen, but will be present in the over-the-air info.

[sergforce]

For 4321 I used wl and tried b43 to get captures on air but without a luck
so far.

[botik32]

no worries, got a wireshark capture for successful join, and getting the
bad case capture in 10 minutes

On Tue, Oct 1, 2013 at 10:33 PM, sergforce notifications@github.com wrote:

For 4321 I used wl and tried b43 to get captures on air but without a luck
so far.

On Tue, Oct 1, 2013 at 4:04 PM, lwfinger notifications@github.com
wrote:

I seldom use ad-hoc mode, and it will be some time before I would be
able
to work on this problem.

It would be helpful if you set up wireshark on a third computer to
capture
the over-the-air traffic. You need to capture the working case when the
non-8188eu device is started first, and the non-working case when the
8188eu unit is started before the BCM4321.

Which driver are you using on the 4321?

—
Reply to this email directly or view it on GitHub<
https://github.com/lwfinger/rtl8188eu/issues/4#issuecomment-25443412>
.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/4#issuecomment-25444942
.

[botik32]

I wish I could attach a file here. Otherwise I'll just send them by e-mail

[botik32]

https://docs.google.com/file/d/0B5QI4DmQSXpxaU5LLXNaekRtOFE/edit?usp=drive_web
https://docs.google.com/file/d/0B5QI4DmQSXpxU2xkTWM1VnhUWFk/edit?usp=drive_web

The bad case tried connecting to essid "daihinia2", since it appears some of my neighbours latched onto "daihinia".
The good case connected to essid "daihinia" which someone was part of.
Also note that 2 identical rtl8188eu devices were connecting from the same machine.
Please let me know if this is ok.

[sergforce]

Hi Alex,

Is it capture with 802.11 ? I tried to open it in Wireshark and it says
it's Ethernet with 0x886c packet type. And it doesn't know 0x886c. Which
dissector are you using?

Air capture isn't working on BCM4321 :( Trying to get one which supports.

On Tue, Oct 1, 2013 at 5:25 PM, botik32 notifications@github.com wrote:

https://docs.google.com/file/d/0B5QI4DmQSXpxaU5LLXNaekRtOFE/edit?usp=drive_web

https://docs.google.com/file/d/0B5QI4DmQSXpxU2xkTWM1VnhUWFk/edit?usp=drive_web

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/4#issuecomment-25448119
.

[botik32]

same here, wireshark did not know how to decode it...

On Tue, Oct 1, 2013 at 11:58 PM, sergforce notifications@github.com wrote:

Hi Alex,

Is it capture with 802.11 ? I tried to open it in Wireshark and it says
it's Ethernet with 0x886c packet type. And it doesn't know 0x886c. Which
dissector are you using?

Air capture isn't working on BCM4321 :( Trying to get one which supports.

On Tue, Oct 1, 2013 at 5:25 PM, botik32 notifications@github.com wrote:

https://docs.google.com/file/d/0B5QI4DmQSXpxaU5LLXNaekRtOFE/edit?usp=drive_web

https://docs.google.com/file/d/0B5QI4DmQSXpxU2xkTWM1VnhUWFk/edit?usp=drive_web

—
Reply to this email directly or view it on GitHub<
https://github.com/lwfinger/rtl8188eu/issues/4#issuecomment-25448119>
.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/4#issuecomment-25451434
.