DHCP - WLAN behaviour of Windows Notebooks

Sat Sep 8 12:37:45 UTC 2007

Hi,

some questions:

- What version of chilli are you using? Check your root crontab for any
chilli init script calls with argument "arping" - it's a feature, actually,
I will completely remove in the next release. If you're using 1.0.7, it
shouldn't be an issue (the init script no longer has the feature).

- Are your WiFi clients using any client software (a smart-client or that
sort of thing)? Maybe running something in the background (boingo, whisher,
whatever)?

- Have you tried using 'uamanyip' to see if that makes any difference?

- Do you do any kind of signal scanning from your AP or dynamic changing of
settings?

It's an interesting problem - in the client. I think chilli does the right
thing upon getting a DHCP release... but would be interesting for it to
reserve the IP for a short time.

David

On 9/8/07, lc <chilli at silverserver.at> wrote:
>
>
> I had also a small e-mail conversation about the following with David
> (thanks for keeping chilli alive!) - but I still do not know how this
> "problem" can be dealt with.
>
>
> It seems that there are machines that - for no obvious reason -
> disassociate and reassociate to the AP even when they signal quality
> is excellent and no other disturbing radio exists. This seems to
> happen intentionally because the client seems to release the DHCP
> address before disassociating. And this is why chilli releases the
> address and closes the session. If the client would just lose the
> connection and reassociate, chilli wouldn't know about it unless the
> DHCP lease time has been reached (=no problem).
>
> After such a client re-associates, chilli hands out a new IP address
> and the user has to log-in again. While the re-login could be handled
> automatically (so the user won't notice it) the new IP address is a
> problem - existing connections (e.g. google mail etc) get interrupted.
>
> I have noticed this behaviour on Windows notebooks. The user can also
> see it because at the Windows task bar a message pops up telling the
> user that he is now connected to the WLAN xyz although this is the
> very same WLAN he has been already using.
>
> I see this behaviour on many locations, and I also see that it does
> not happen with all clients. e.g. on the same location at the same
> time one client behaves like in the log below while others stay
> connected for hours without any interruption. This is why I believe
> the client's machine is the cause.
>
> Here is a log showing that there are only a few seconds between the
> releasing of the address and handing out a new address for the same
> client.
>
> Chilli-Log:
> Jul 26 14:29:20 OpenWRT kern.notice chillispot[841]: chilli.c: 2905:
> Successful UAM login from username=00-18-DE-77-9B-43 IP=192.168.100.25
> Jul 26 14:33:09 OpenWRT kern.info chillispot[841]: chilli.c: 2690:
> DHCP addr released by MAC=00-18-DE-77-9B-43 IP=192.168.100.25
>
> Jul 26 14:33:12 OpenWRT kern.notice chillispot[841]: chilli.c: 2608:
> New DHCP request from MAC=00-18-DE-77-9B-43
> Jul 26 14:33:12 OpenWRT kern.notice chillispot[841]: chilli.c: 2570:
> Client MAC=00-18-DE-77-9B-43 assigned IP 192.168.100.27
> Jul 26 14:35:42 OpenWRT kern.notice chillispot[841]: chilli.c: 2905:
> Successful UAM login from username=00-18-DE-77-9B-43 IP=192.168.100.27
> Jul 26 15:03:30 OpenWRT kern.info chillispot[841]: chilli.c: 2690:
> DHCP addr released by MAC=00-18-DE-77-9B-43 IP=192.168.100.27
>
> Jul 26 15:06:36 OpenWRT kern.notice chillispot[841]: chilli.c: 2608:
> New DHCP request from MAC=00-18-DE-77-9B-43
> Jul 26 15:06:36 OpenWRT kern.notice chillispot[841]: chilli.c: 2570:
> Client MAC=00-18-DE-77-9B-43 assigned IP 192.168.100.30
> Jul 26 15:12:55 OpenWRT kern.info chillispot[841]: chilli.c: 2690:
> DHCP addr released by MAC=00-18-DE-77-9B-43 IP=192.168.100.30
>
> Jul 26 15:13:30 OpenWRT kern.notice chillispot[841]: chilli.c: 2608:
> New DHCP request from MAC=00-18-DE-77-9B-43
> Jul 26 15:13:30 OpenWRT kern.notice chillispot[841]: chilli.c: 2570:
> Client MAC=00-18-DE-77-9B-43 assigned IP 192.168.100.31
> Jul 26 15:14:41 OpenWRT kern.notice chillispot[841]: chilli.c: 2905:
> Successful UAM login from username=00-18-DE-77-9B-43 IP=192.168.100.31
> Jul 26 15:19:49 OpenWRT kern.info chillispot[841]: chilli.c: 2690:
> DHCP addr released by MAC=00-18-DE-77-9B-43 IP=192.168.100.31
>
> Jul 26 15:23:22 OpenWRT kern.notice chillispot[841]: chilli.c: 2608:
> New DHCP request from MAC=00-18-DE-77-9B-43
> Jul 26 15:23:22 OpenWRT kern.notice chillispot[841]: chilli.c: 2570:
> Client MAC=00-18-DE-77-9B-43 assigned IP 192.168.100.33
> Jul 26 15:28:24 OpenWRT kern.info chillispot[841]: chilli.c: 2690:
> DHCP addr released by MAC=00-18-DE-77-9B-43 IP=192.168.100.33
>
> Jul 26 15:30:42 OpenWRT kern.notice chillispot[841]: chilli.c: 2608:
> New DHCP request from MAC=00-18-DE-77-9B-43
> Jul 26 15:30:42 OpenWRT kern.notice chillispot[841]: chilli.c: 2570:
> Client MAC=00-18-DE-77-9B-43 assigned IP 192.168.100.34
> Jul 26 15:32:54 OpenWRT kern.notice chillispot[841]: chilli.c: 2905:
> Successful UAM login from username=00-18-DE-77-9B-43 IP=192.168.100.34
> Jul 26 15:42:15 OpenWRT kern.info chillispot[841]: chilli.c: 2690:
> DHCP addr released by MAC=00-18-DE-77-9B-43 IP=192.168.100.34
>
> Jul 26 15:42:17 OpenWRT kern.notice chillispot[841]: chilli.c: 2608:
> New DHCP request from MAC=00-18-DE-77-9B-43
> Jul 26 15:42:17 OpenWRT kern.notice chillispot[841]: chilli.c: 2570:
> Client MAC=00-18-DE-77-9B-43 assigned IP 192.168.100.36
> Jul 26 15:44:28 OpenWRT kern.notice chillispot[841]: chilli.c: 2905:
> Successful UAM login from username=00-18-DE-77-9B-43 IP=192.168.100.36
> Jul 26 15:49:39 OpenWRT kern.info chillispot[841]: chilli.c: 2690:
> DHCP addr released by MAC=00-18-DE-77-9B-43 IP=192.168.100.36
>
> Jul 26 15:50:00 OpenWRT kern.notice chillispot[841]: chilli.c: 2608:
> New DHCP request from MAC=00-18-DE-77-9B-43
> Jul 26 15:50:00 OpenWRT kern.notice chillispot[841]: chilli.c: 2570:
> Client MAC=00-18-DE-77-9B-43 assigned IP 192.168.100.37
> Jul 26 15:52:07 OpenWRT kern.notice chillispot[841]: chilli.c: 2905:
> Successful UAM login from username=00-18-DE-77-9B-43 IP=192.168.100.37
> Jul 26 16:29:56 OpenWRT kern.info chillispot[841]: chilli.c: 2690:
> DHCP addr released by MAC=00-18-DE-77-9B-43 IP=192.168.100.37
>
> Jul 26 16:30:18 OpenWRT kern.notice chillispot[841]: chilli.c: 2608:
> New DHCP request from MAC=00-18-DE-77-9B-43
> Jul 26 16:30:18 OpenWRT kern.notice chillispot[841]: chilli.c: 2570:
> Client MAC=00-18-DE-77-9B-43 assigned IP 192.168.100.40
> Jul 26 16:36:48 OpenWRT kern.notice chillispot[841]: chilli.c: 2905:
> Successful UAM login from username=00-18-DE-77-9B-43 IP=192.168.100.40
> Jul 26 16:50:15 OpenWRT kern.info chillispot[841]: chilli.c: 2690:
> DHCP addr released by MAC=00-18-DE-77-9B-43 IP=192.168.100.40
>
> Jul 26 16:51:42 OpenWRT kern.notice chillispot[841]: chilli.c: 2608:
> New DHCP request from MAC=00-18-DE-77-9B-43
> Jul 26 16:51:42 OpenWRT kern.notice chillispot[841]: chilli.c: 2570:
> Client MAC=00-18-DE-77-9B-43 assigned IP 192.168.100.41
> Jul 26 16:55:22 OpenWRT kern.notice chillispot[841]: chilli.c: 2905:
> Successful UAM login from username=00-18-DE-77-9B-43 IP=192.168.100.41
>
> So the question is:
>
> Does anybody know what triggers this behaviour of Windows (maybe some
> energy saving issue which works in a weird way)?
> Is there a way to make chilli temporarily bind an IP address to a mac
> address so that it would re-assign the same IP to the same client MAC
> within a certain timeframe?
>
> Thanks,
>
> lc
>
>
> Am 15.08.2007 um 10:20 schrieb Yannick Deltroo:
>
>
> > Alex,
> >
> > I've seen that you've changed the DHCP range of IPs from the default.
> > Check that the three parameters net/dynip/statip are correctly set (in
> > particular the netmask part).
> >
> > Also check that the lease parameter is not too short for the client
> > operating system to accept the DHCP lease returned by Chilli.
> >
> > By the way, Chillispot is going to NAT your public addresses in the
> > default configuration.
> > For more info, see this thread,
> > http://coova.org/phpBB3/viewtopic.php?
> > f=4&t=157&sid=6d5907c41c5aa11b528345295892dff9
> >
> > Cheers
> >
> > On 8/15/07, Alex Nderitu <anderitu at africaonline.co.ke> wrote:
> >
> >>
> >>  Hi All,
> >>  I have a problem where wireless clients are not allocated dhcp
> >> addresses on accessing chillispot. However from the log files I
> >> can see chillispot is issuing the addresses on accessing the
> >> wireless network. Has anyone come across this and whats the work
> >> around.
> >>
> >>  Logs from chilli
> >>  -----------------------
> >>  Aug 14 15:40:03 hotspot chillispot[7333]: chilli.c: 3082: DHCP
> >> addr released by MAC=00-16-6F-C3-7E-5F IP=41.207.76.34
> >>  Aug 14 15:40:05 hotspot chillispot[7333]: chilli.c: 3041: New
> >> DHCP request from MAC=00-16-6F-C3-7E-5F
> >>  Aug 14 15:40:05 hotspot chillispot[7333]: chilli.c: 3011: Client
> >> MAC=00-16-6F-C3-7E-5F assigned IP 41.207.76.35
> >>  Aug 14 15:40:18 hotspot chillispot[7333]: chilli.c: 3082: DHCP
> >> addr released by MAC=00-16-6F-C3-7E-5F IP=41.207.76.35
> >>  Aug 14 15:40:21 hotspot chillispot[7333]: chilli.c: 3041: New
> >> DHCP request from MAC=00-16-6F-C3-7E-5F
> >>  Aug 14 15:40:21 hotspot chillispot[7333]: chilli.c: 3011: Client
> >> MAC=00-16-6F-C3-7E-5F assigned IP 41.207.76.36
> >>  Aug 14 15:41:31 hotspot chillispot[7333]: chilli.c: 3041: New
> >> DHCP request from MAC=00-19-D2-30-B3-A1
> >>  Aug 14 15:41:31 hotspot chillispot[7333]: chilli.c: 3011: Client
> >> MAC=00-19-D2-30-B3-A1 assigned IP 41.207.76.37
> >>  Aug 14 15:45:49 hotspot chillispot[7333]: chilli.c: 3082: DHCP
> >> addr released by MAC=00-16-6F-C3-7E-5F IP=41.207.76.36
> >>  Aug 14 15:45:51 hotspot chillispot[7333]: chilli.c: 3041: New
> >> DHCP request from MAC=00-16-6F-C3-7E-5F
> >>  Aug 14 15:45:51 hotspot chillispot[7333]: chilli.c: 3011: Client
> >> MAC=00-16-6F-C3-7E-5F assigned IP 41.207.76.38
> >>  Aug 14 15:48:32 hotspot chillispot[7333]: chilli.c: 3041: New
> >> DHCP request from MAC=00-16-6F-55-01-21
> >>  Aug 14 15:48:32 hotspot chillispot[7333]: chilli.c: 3011: Client
> >> MAC=00-16-6F-55-01-21 assigned IP 41.207.76.39
> >>  Aug 14 15:49:10 hotspot chillispot[7333]: chilli.c: 3041: New
> >> DHCP request from MAC=00-06-F4-0D-4B-DA
> >>  Aug 14 15:49:10 hotspot chillispot[7333]: chilli.c: 3011: Client
> >> MAC=00-06-F4-0D-4B-DA assigned IP 41.207.76.40
> >>  Aug 14 15:52:12 hotspot chillispot[7333]: chilli.c: 3082: DHCP
> >> addr released by MAC=00-16-6F-C3-7E-5F IP=41.207.76.38
> >>  Aug 14 15:52:14 hotspot chillispot[7333]: chilli.c: 3041: New
> >> DHCP request from MAC=00-16-6F-C3-7E-5F
> >>  Aug 14 15:52:14 hotspot chillispot[7333]: chilli.c: 3011: Client
> >> MAC=00-16-6F-C3-7E-5F assigned IP 41.207.76.41
> >>  Aug 14 15:53:46 hotspot chillispot[7333]: chilli.c: 3082: DHCP
> >> addr released by MAC=00-16-6F-C3-7E-5F IP=41.207.76.41
> >>  Aug 14 15:53:53 hotspot chillispot[7333]: chilli.c: 3082: DHCP
> >> addr released by MAC=00-19-D2-30-B3-A1 IP=41.207.76.37
> >>  Aug 14 15:53:59 hotspot chillispot[7333]: chilli.c: 3041: New
> >> DHCP request from MAC=00-16-6F-C3-7E-5F
> >>  Aug 14 15:53:59 hotspot chillispot[7333]: chilli.c: 3011: Client
> >> MAC=00-16-6F-C3-7E-5F assigned IP 41.207.76.43
> >>  Aug 14 15:55:04 hotspot chillispot[7333]: chilli.c: 3082: DHCP
> >> addr released by MAC=00-16-6F-C3-7E-5F IP=41.207.76.43
> >>  Aug 14 15:55:06 hotspot chillispot[7333]: chilli.c: 3041: New
> >> DHCP request from MAC=00-16-6F-C3-7E-5F
> >>
> >>
> >> --
> >>
> >>  Regards,
> >>
> >>  Alex Nderitu
> >>  Systems Administration
> >>  Africa Online, Kenya
> >>  Tel: +254 (20) 27 92 253
> >>  Fax: +254 (20) 27 100 10
> >>  Email: anderitu at africaonline.co.ke
> >>  AIM: nderitualex
> >>
> >>
> >>    A member of the Telkom South Africa Group
>
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