Re: checking wireless cable
On Aug 19, 2011, at 10:22 PM, Oleg Goldshmidt wrote: geoffrey mendelson geoffreymendel...@gmail.com writes: My guess is that you changed the region/country/jusridiction In different parts of the world, different channels are legal. For example, in some places channels 1-13 are legal, others, 1-12, or 3-14. In Israel it is 4-8 with 1-3 and 9-13 shared with the IDF. Since a wifi channel really uses 3 channels, one one each side of the main channel, if your router is set for one jurisdiction and the computer another, channels at either end may not work. I'm sure is not applicable to you, is that if you don't change the SSID or use encryption, your computer will sign on to the strongest network of the same name. As the signal fades or gets stronger (roaming) the computer will switch to the strongest signal it finds. All those people who got BEZEQ wifi routers with an SSID of SIEMENS were using each other's wifi without knowing it. Don't say it's not happening now, when I was in the hospital in April, there were 3 networks I could reach, the hospital's protected network for internal use, the hopsital's open networks giving almost 100% coverage on several channels and an open network with a default name from another building. A friend of mine just moved to haifa, and he found that there was free wifi in his new apartment. :-( Geoff. -- Geoffrey S. Mendelson, N3OWJ/4X1GM ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: checking wireless cable
geoffrey mendelson geoffreymendel...@gmail.com writes: My guess is that you changed the region/country/jusridiction What do you mean? to one where channel 2 is not legal. CHANNEL is set to auto... Where you just in the new world? The old one, actually, and I didn't use my laptop there at all. -- Oleg Goldshmidt | p...@goldshmidt.org ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: checking wireless cable [SORT OF SOLVED]
OK, it is sort of solved, but I don't know what combination of incantations was crucial. In the hope that it may help someone in the future here is a rough reconstruction of what I did, minus various futile attempts. I added PERSISTENT_DHCLIENT=yes to ifcfg-wlan0, commented out KEY_MGMT=WPA-PSK, and disabled security on the router. I also kept NM_CONTROLLED=no. I removed all the *.lease and *.leases files from /var/lib/dhclient. I restarted the computer. I kept watching /var/log/messages and iwevent in two terminals to see what was going on. This led to success - I connected. I concluded that the problem was related to WPA-PSK in one way or another. I reenabled WPA2/personal security on the router and set the PSK to a new value. I uncommented KEY_MGMT in ifcfg-wlan0 and modified WPA_PSK in keys-wlan0. This led to an interesting conclusion that despite all this iwevent still showed that wlan0 operated with Encryption key: off which I thought was weird (wpa_supplicant was running - I checked). As a result I saw in syslog that there were no DHCP offers and the thing evenually timed out (multiple times since I kept PERSISTENT_DHCLIENT=yes). I had a hunch that wpa_supplicant was somehow controlled by NetworkManager which, since I had disabled its control over wlan0, did not pick up the configuration change. This was a complete WAG (not the British variety - the American one - wild-assed guess), I really have no idea what I am talking about here - I could never figure out what the bloody NM did or did not do - its documentation is appaling/non-existent. Am I right that it is a GNOME thingy (I am a KDE user)? I re-enabled NM_CONTROLLED=yes in the hope that NM would somehow affect wpa_supplicant. It did - *somehow*, I don't understand exactly how - but now syslog got flooded with NM messages related to wpa_supplicant's state changing between disconnected and scanning. Unfortunately, the link never got to a working state - NM kept issuing a link timed out warning. It was absolutely unclear to me what was going on (googling at various stages did not help) and on a hunch I went the Microsoft way and rebooted the computer once again (I do not know if just reloading iwlagn module would help as much). Lo and behold, I had wireless working after boot! So now I am basically back to the original configuration, with a different WPA_PSK and with PERSISTENT_DHCLIENT=yes, but I seriously doubt either of these changes is actually relevant. It didn't work until I rebooted, but I had rebooted more than once in the original configuration, too... It's got to be simpler. I consider myself to be fairly knowledgeable and experienced, but it took me quite a while and I still don't know what the problem was or what the fix was. Proudly sent through a wireless interface... -- Oleg Goldshmidt | p...@goldshmidt.org ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
checking wireless cable
Hi, I have a weird - and rather embarrassing - problem after returning home from a trip. My laptop's wireless card can't connect to the wireless router (D-Link DIR-615) anymore. I am fairly certain that no configuration has changed. Fedora 14 on an X200 ThinkPad with Intel iwl5100AGN card. Firmware installed, kernel 2.6.35.13-91.fc14.x86_64, # lsmod | grep iwlagn iwlagn209445 0 iwlcore 195698 1 iwlagn mac80211 229063 2 iwlagn,iwlcore cfg80211 134981 3 iwlagn,iwlcore,mac80211 (tried to reload iwlagn multiple times). Restarting the network yields: Bringing up interface wlan0: Determining IP information for wlan0... failed; no link present. Check cable? (a fun message IMHO). In /var/log/messages I see kernel: [ 2355.907603] ADDRCONF(NETDEV_UP): wlan0: link is not ready Things I've tried (beyond fruitless googling, of course - no forums have useful info of any kind): 1. disabling wireless security 2. making sure the device is not under NetworkManager control (switched on and off, uninstalled NM and reinstalled again) - NM is not to blame 3. restarting everything multiple times (and checking BIOS settings) 4. making sure another wireless device (phone) connects to the same router without a problem 5. making sure that wpa_supplicant does not run 6. Ethernet works fine so it is not a general networking issue 7. tried connecting with WiFiRadar, wlassistant - to no avail None of the above makes any difference. Has anyone encountered anything similar? Any suggestions for things I should try? For completeness here is ifcfg-wlan0 (asterisks mask irrelevant identifying info): TYPE=Wireless DEVICE=wlan0 BOOTPROTO=dhcp ONBOOT=yes USERCTL=yes IPV6INIT=no NM_CONTROLLED=no MODE=Managed RATE=auto HWADDR=**:**:**:**:**:** KEY_MGMT=WPA-PSK DEFROUTE=yes PEERDNS=yes PEERROUTES=yes DHCP_HOSTNAME=** IPV4_FAILURE_FATAL=yes NAME=wlan0 ESSID= CHANNEL= I played with NM_CONTROLLED, KEY_MGMT (disabled security), and ESSID (setting to specific value). Thanks, -- Oleg Goldshmidt | p...@goldshmidt.org ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: checking wireless cable
On Thu, Aug 18, 2011 at 10:02:14PM +0300, Oleg Goldshmidt wrote: Has anyone encountered anything similar? Any suggestions for things I should try? What is the output of 'iwconfig' and of 'iwlist scanning', both as root? I have a feeling it won't say much, but just in case. -- Didi ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: checking wireless cable
Yedidyah Bar-David linux...@didi.bardavid.org writes: On Thu, Aug 18, 2011 at 10:02:14PM +0300, Oleg Goldshmidt wrote: Has anyone encountered anything similar? Any suggestions for things I should try? What is the output of 'iwconfig' and of 'iwlist scanning', both as root? I have a feeling it won't say much, but just in case. # iwconfig wlan0 wlan0 IEEE 802.11abgn ESSID:off/any Mode:Managed Frequency:2.417 GHz Access Point: Not-Associated Tx-Power=15 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off In the following the important part is related to ESSID=oleggw (my router): # iwconfig scanning # non-wireless output/errors omitted wlan0 Scan completed : Cell 01 - Address: 00:21:04:D2:EF:22 Channel:1 Frequency:2.412 GHz (Channel 1) Quality=51/70 Signal level=-59 dBm Encryption key:on ESSID:orange-6PSR Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s 9 Mb/s; 12 Mb/s; 18 Mb/s Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s Mode:Master Extra:tsf=000c7003f722 Extra: Last beacon: 3232ms ago IE: Unknown: 000B6F72616E67652D36505352 IE: Unknown: 010882848B968C129824 IE: Unknown: 030101 IE: IEEE 802.11i/WPA2 Version 1 Group Cipher : TKIP Pairwise Ciphers (2) : CCMP TKIP Authentication Suites (1) : PSK IE: WPA Version 1 Group Cipher : TKIP Pairwise Ciphers (2) : CCMP TKIP Authentication Suites (1) : PSK IE: Unknown: 2A0100 IE: Unknown: 3204B048606C IE: Unknown: DD180050F2020101830003A427A442435E0062322F00 IE: Unknown: DD0900037F01010020FF7F IE: Unknown: DD0A00037F040100 IE: Unknown: DDB00050F204104A000110104400010210570001001041000100103B00010310470010565AA94967C14C0EAA8FF349E6F593111021001B4A756E676F20536F66747761726520546563686E6F6C6F676965731023001C4F72616E676520475720506F72746120322E3020506C6174666F726D1024000B6F72616E676567772D70321042000C3030323130343031353438371054000800060050F2040001101100064F70656E5247100800020084103C000101 Cell 02 - Address: 00:18:E7:E8:4A:4B Channel:2 Frequency:2.417 GHz (Channel 2) Quality=70/70 Signal level=-22 dBm Encryption key:on ESSID:oleggw Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s 9 Mb/s; 12 Mb/s; 18 Mb/s Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s Mode:Master Extra:tsf=0207805f Extra: Last beacon: 3228ms ago IE: Unknown: 00066F6C65676777 IE: Unknown: 010882848B960C121824 IE: Unknown: 030102 IE: IEEE 802.11i/WPA2 Version 1 Group Cipher : TKIP Pairwise Ciphers (1) : TKIP Authentication Suites (1) : PSK IE: WPA Version 1 Group Cipher : TKIP Pairwise Ciphers (1) : TKIP Authentication Suites (1) : PSK IE: Unknown: 2A0100 IE: Unknown: 32043048606C IE: Unknown: DD180050F2020101010003A427A442435E0062322F00 IE: Unknown: DD1E00904C334C101B00 IE: Unknown: 2D1A4C101B00 IE: Unknown: DD1A00904C3402001B00 IE: Unknown: 3D1602001B00 IE: Unknown: DD0900037F0101FF7F IE: Unknown: DD0A00037F0401000400 IE: Unknown: DD7B0050F204104A00011010440001021041000100103B00010310470010565AA94967C14C0EAA8FF349E6F5931110210006442D4C696E6B1023000D442D4C696E6B20526F75746572102400074449522D363135104200046E6F6E651054000800060050F204000110110006442D4C696E6B100800020084103C000101 Cell 03 - Address: 00:21:04:89:81:12 Channel:6 Frequency:2.437 GHz (Channel 6) Quality=42/70 Signal level=-68 dBm Encryption key:on ESSID:swl-u Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
Re: checking wireless cable
On Aug 19, 2011, at 12:21 AM, Oleg Goldshmidt wrote: What is the output of 'iwconfig' and of 'iwlist scanning', both as root? I have a feeling it won't say much, but just in case. My guess is that you changed the region/country/jusridiction to one where channel 2 is not legal. Where you just in the new world? Geoff. -- Geoffrey S. Mendelson, N3OWJ/4X1GM ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
