5Ghz Atheros
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Je 5GHz legální? Jaké jsou frekvence, kanály a povolené výkony?
Vše viz
http://cz-free.net/phpBB2/viewforum.php?f=11
Střípky z indoor testovani karet Atheros AR5212 (na 5.8 GHz) v Linuxu
hardware: http://www.i4shop.net/cz/iObchod/Catalog.asp?ca=1626&it=9153 v PCI redukci, Pentium III 450 MHz. software: Linux 2.4.27-hk11b, madwifi CVS 20.4.2005
Jak to vidí PCI sběrnice:
# lspci 0000:00:09.0 Ethernet controller: Atheros Communications, Inc. AR5212 802.11abg NIC (rev 01) 0000:00:0a.0 Ethernet controller: Atheros Communications, Inc. AR5212 802.11abg NIC (rev 01) # lspci -n 0000:00:09.0 0200: 168c:0013 (rev 01) 0000:00:0a.0 0200: 168c:0013 (rev 01)
Ovladače madwifi po zkompilování
08:52:39 CF-Linux-router:~# ll /lib/modules/2.4.27-hk11b/net/ -rw-r--r-- 1 root vojta 161580 Apr 19 09:32 ath_hal.o -rw-r--r-- 1 root vojta 58144 Apr 19 09:32 ath_pci.o -rw-r--r-- 1 root vojta 8136 Apr 19 09:32 ath_rate_onoe.o -rw-r--r-- 1 root vojta 118808 Apr 19 09:32 wlan.o -rw-r--r-- 1 root vojta 4304 Apr 19 09:32 wlan_acl.o -rw-r--r-- 1 root vojta 6676 Apr 19 09:32 wlan_ccmp.o -rw-r--r-- 1 root vojta 11380 Apr 19 09:32 wlan_tkip.o -rw-r--r-- 1 root vojta 5100 Apr 19 09:32 wlan_wep.o -rw-r--r-- 1 root vojta 1696 Apr 19 09:32 wlan_xauth.o
Ovladače madwifi startují (modprobe ath_pci)
ath_hal: 0.9.14.9 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413) ath_rate_onoe: 1.0 ath_pci: 0.9.4.12 (EXPERIMENTAL) PCI: Found IRQ 7 for device 00:09.0 ath0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps ath0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps ath0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps ath0: turbo rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps ath0: mac 5.6 phy 4.1 radio 3.6 ath0: 802.11 address: 00:60:b3:c5:c3:b1 ath0: Use hw queue 0 for WME_AC_BE traffic ath0: Use hw queue 1 for WME_AC_BK traffic ath0: Use hw queue 2 for WME_AC_VI traffic ath0: Use hw queue 3 for WME_AC_VO traffic ath0: Atheros 5212: mem=0xec010000, irq=7 PCI: Found IRQ 9 for device 00:0a.0 ath1: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps ath1: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps ath1: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps ath1: turbo rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps ath1: mac 5.6 phy 4.1 radio 3.6 ath1: 802.11 address: 00:60:b3:c5:c4:19 ath1: Use hw queue 0 for WME_AC_BE traffic ath1: Use hw queue 1 for WME_AC_BK traffic ath1: Use hw queue 2 for WME_AC_VI traffic ath1: Use hw queue 3 for WME_AC_VO traffic ath1: Atheros 5212: mem=0xec000000, irq=9
Testovaci nastaveni - jedna karta je AP a druha karta je klient
ifconfig ath0 up ifconfig ath1 up iwconfig ath0 mode master iwconfig ath0 channel 161 # To jest 5.805 GHz iwconfig ath0 essid "Garaz" iwconfig ath1 mode managed iwconfig ath1 essid any
Behem chvile se ath1 asociuje na ath0:
ath0 IEEE 802.11a ESSID:"Garaz"
Mode:Master Frequency:5.805GHz Access Point: 00:60:B3:C5:C3:B1
Bit Rate:0kb/s Tx-Power:50 dBm Sensitivity=0/0
Retry:off RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality:83/0 Signal level:-12 dBm Noise level:-95 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
ath1 IEEE 802.11a ESSID:"Garaz"
Mode:Managed Frequency:5.805GHz Access Point: 00:60:B3:C5:C3:B1
Bit Rate:36Mb/s Tx-Power:50 dBm Sensitivity=0/0
Retry:off RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality:83/0 Signal level:-12 dBm Noise level:-95 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
A pomoci skriptu od pavkrize (zde na wiki) muzeme z jedne sitovky na druhou pingat venkem pres radio.
ping s 64B pakety temer nerozezname od ethernetoveho spojeni: 0.4 ms
# ping -i 0.1 192.168.10.1 PING 192.168.10.1 (192.168.10.1) 56(84) bytes of data. 64 bytes from 192.168.10.1: icmp_seq=1 ttl=64 time=0.381 ms 64 bytes from 192.168.10.1: icmp_seq=2 ttl=64 time=0.387 ms 64 bytes from 192.168.10.1: icmp_seq=3 ttl=64 time=0.385 ms 64 bytes from 192.168.10.1: icmp_seq=4 ttl=64 time=0.393 ms 64 bytes from 192.168.10.1: icmp_seq=5 ttl=64 time=0.387 ms 64 bytes from 192.168.10.1: icmp_seq=6 ttl=64 time=0.385 ms 64 bytes from 192.168.10.1: icmp_seq=7 ttl=64 time=0.385 ms 64 bytes from 192.168.10.1: icmp_seq=8 ttl=64 time=0.376 ms 64 bytes from 192.168.10.1: icmp_seq=9 ttl=64 time=0.384 ms 64 bytes from 192.168.10.1: icmp_seq=10 ttl=64 time=0.381 ms --- 192.168.10.1 ping statistics --- 10 packets transmitted, 10 received, 0% packet loss, time 914ms rtt min/avg/max/mdev = 0.376/0.384/0.393/0.018 ms
ping s 1.5kB pakety: 1.1 ms
# ping -i 0.1 192.168.10.1 -s 1490 PING 192.168.10.1 (192.168.10.1) 1490(1518) bytes of data. 1498 bytes from 192.168.10.1: icmp_seq=1 ttl=64 time=1.10 ms 1498 bytes from 192.168.10.1: icmp_seq=2 ttl=64 time=1.08 ms 1498 bytes from 192.168.10.1: icmp_seq=3 ttl=64 time=1.06 ms 1498 bytes from 192.168.10.1: icmp_seq=4 ttl=64 time=1.36 ms 1498 bytes from 192.168.10.1: icmp_seq=5 ttl=64 time=1.07 ms 1498 bytes from 192.168.10.1: icmp_seq=6 ttl=64 time=1.08 ms 1498 bytes from 192.168.10.1: icmp_seq=7 ttl=64 time=1.06 ms 1498 bytes from 192.168.10.1: icmp_seq=8 ttl=64 time=1.06 ms 1498 bytes from 192.168.10.1: icmp_seq=9 ttl=64 time=1.06 ms --- 192.168.10.1 ping statistics --- 9 packets transmitted, 9 received, 0% packet loss, time 878ms rtt min/avg/max/mdev = 1.060/1.107/1.365/0.100 ms
Zveřejnil VojtaLhota 4/2005
Pokud nechcete aby se karta zavadela jako ath ale napr. jako eth pouzijte pri zavadeni modulu tento prikaz:
modprobe ath_pci ifname="eth"
Nastaveni regionu napr. Nemecko (meni rozsah kanalu - ten je mozne zjistit prikazem: iwlist channel):
modprobe ath_pci countrycode=276
AirCA8 a jeho regulace výkonu
HW klient http://www.i4shop.net/cz/iObchod/Catalog.asp?ca=1620&it=9240 má nastavení TX power ve 4 krocích: 100%, 75%, 50%, 25% nebo no power.
Při použití tohoto klienta proti AP (atheros AR5212, Linux, madwifi) hlásí toto AP sílu signálu od klienta takto:
100% 00:0B:6B:3B:F2:96 : Quality=32/94 Signal level=-63 dBm Noise level=-95 dBm 75% 00:0B:6B:3B:F2:96 : Quality=28/94 Signal level=-67 dBm Noise level=-95 dBm 50% 00:0B:6B:3B:F2:96 : Quality=24/94 Signal level=-71 dBm Noise level=-95 dBm 25% 00:0B:6B:3B:F2:96 : Quality=18/94 Signal level=-77 dBm Noise level=-95 dBm
- Jedná se o měření na koleně, údaje v dBm nemají v absolutní hodnotě význam, šlo mi jen o srovnání. Krok 25% tedy odpovídá zhruba 5 dBm.
- Při nastavení "no power" se přenos dat na cca 10s zastavil a poté znovu rozběhl se signal level okolo -64 dBm (odpovida 100%) i přesto, že AirCA stále ukazuje nastaveni "no power".
Zveřejnil VojtaLhota 4/2005
