Re: How to troubleshoot why ath0 can't connect to a passwordless wireless network?

Yuri wrote:
I have a several wireless networks without password that my linux box easily connects to.

On FreeBSD 'ifconfig ath0 up scan' command shows it. 'ifconfig ath0 ssid <my-ssid> up' brings interface to 'associated' state. But dhclient fails to set it up.

I have another device on the same system: ral0. It sometimes connects to these networks ok, sometimes has the same problem.

What can I do to understand what may be a problem with ath0 in my case?

I tried to use tcpdump. It shows outbound DHCP packets and nothing is inbound.

I asked similar question here before, somebody asked me to downgrade atheros driver to one particular lower version. But this didn't help.

Relevant dmesg lines are:
ath_hal: 0.9.30.13 (AR5210, AR5211, AR5212, AR5216, RF5111, RF5112, RF2413, RF5413, RF2133)
ath0: <Atheros 5212> mem 0xcffe0000-0xcffeffff irq 16 at device 5.0 on pci0
ath0: mac 7.8 phy 4.5 radio 5.6

I use 71-PRERELEASE

You seem to say your network is open (no security). If not you need to show your network configuration.

wlanstats shows statistics collected by the 802.11 layer. athstats show stats collected by the ath driver. Both are important tools for diagnosing problems.

tcpdump can be used to tap traffic at 3 layers: 802.3, 802.11, and driver. It can be used to identify where packets are lost in the hierarchy (if at all).

Assuming packets are going out but not coming back you can sniff from a 3rd station to look for traffic in the air but not received.

Given how little info you posted it's virtually impossible to advise you what is wrong. When in doubt c&p real output; describing a problem often causes useful info to be left out.

BTW hal version 0.9.30.13 was a test build; RELENG_7 has 0.9.20.3 and HEAD has source code for a much newer version.

Sam

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