Hi all,
 
Recently, I found that iwconfig shows increase in Rx invalid nwid on every 5 seconds approximately on
my Intel IXP425 board running OpenWRT and OpenWRT's stable version of madwifi trunk 3314.
 
Does the increase in  Rx invalid nwid degrades the performance of the AP. ? and how can this be minimized
or eliminated?
 
Actually, there are 4 other AP's and 2 stations within the same hall and  iwconfig shows
 
root@OpenWrt:/# iwconfig
lo        no wireless extensions.
eth0      no wireless extensions.
eth1      no wireless extensions.
br-lan    no wireless extensions.
wifi0     no wireless extensions.
ath0      IEEE 802.11g  ESSID:"OpenWrt"  Nickname:""
          Mode:Master  Frequency:2.437 GHz  Access Point: 00:0B:6B:09:2E:66
          Bit Rate:0 kb/s   Tx-Power:19 dBm   Sensitivity=1/1
          Retry:off   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=53/70  Signal level=-43 dBm  Noise level=-96 dBm
          Rx invalid nwid:44877  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0
 
dmesg shows
....
wlan: trunk
ath_hal: module license 'Proprietary' taints kernel.
ath_hal: 2008-10-02 (AR5210, AR5211, AR5212, AR5416, RF5111, RF5112, RF2413, RF5413, RF2133, RF2425, REGOPS_FUNC, DFS, X
R)
ath_rate_minstrel: Minstrel automatic rate control algorithm 1.2 (trunk)
ath_rate_minstrel: look around rate set to 10%
ath_rate_minstrel: EWMA rolloff level set to 75%
ath_rate_minstrel: max segment size in the mrr set to 6000 us
wlan: mac acl policy registered
ath_pci: trunk
PCI: enabling device 0000:00:0f.0 (0340 -> 0342)
Atheros HAL provided by OpenWrt, DD-WRT and MakSat Technologies
wifi0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
wifi0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
wifi0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
wifi0: turboA rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
wifi0: turboG rates: 6Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
wifi0: H/W encryption support: WEP AES AES_CCM TKIP
ath_pci: wifi0: Atheros 5212: mem=0x48000000, irq=28
 
any idea to eliminate this enormous increase ?