Wireless (bg)scan and ARP

Hi

Recently (over the past month or so) I've been having issues with
my wirless NIC.  I'm using wpa_supplicant and DHCP.

Something happens either at the time the lease is renewed, or the
NIC does a background scan or association is lost for a short while
that breaks the ARP table.  The interface remains up, reassociates,
keeps its IP address and the ARP table has entries for hosts on the
local network.  However, until I delete all the entries in the ARP
table, it cannot communicate with hosts that it has ARP entries
for.

Sometimes it take hours to occur, other times it can happen a few
times in a 5 minute interval.

ath_hal: 0.9.20.3 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
ath0: <Atheros 5424/2424> mem 0x98100000-0x9810ffff irq 17 at device 0.0 on pci3
ath0: [ITHREAD]
ath0: using obsoleted if_watchdog interface
ath0: Ethernet address: 00:17:f2:50:66:16
ath0: mac 10.3 phy 6.1 radio 10.2

hw.ath.hal.swba_backoff: 0
hw.ath.hal.sw_brt: 10
hw.ath.hal.dma_brt: 2
hw.ath.hal.version: 0.9.20.3
hw.ath.txbuf: 200
hw.ath.rxbuf: 40
hw.ath.regdomain: 0
hw.ath.countrycode: 0
hw.ath.xchanmode: 1
hw.ath.outdoor: 1
hw.ath.calibrate: 30

dev.ath.0.%desc: Atheros 5424/2424
dev.ath.0.%driver: ath
dev.ath.0.%location: slot=0 function=0 handle=\_SB_.PCI0.RP02.PXS2
dev.ath.0.%pnpinfo: vendor=0x168c device=0x001c subvendor=0x106b subdevice=0x008
6 class=0x020000
dev.ath.0.%parent: pci3
dev.ath.0.smoothing_rate: 95
dev.ath.0.sample_rate: 10
dev.ath.0.countrycode: 0
dev.ath.0.regdomain: 106
dev.ath.0.slottime: 9
dev.ath.0.acktimeout: 48
dev.ath.0.ctstimeout: 48
dev.ath.0.softled: 0
dev.ath.0.ledpin: 0
dev.ath.0.ledon: 0
dev.ath.0.ledidle: 2700
dev.ath.0.txantenna: 0
dev.ath.0.rxantenna: 1
dev.ath.0.diversity: 1
dev.ath.0.txintrperiod: 5
dev.ath.0.diag: 0
dev.ath.0.tpscale: 0
dev.ath.0.tpc: 0
dev.ath.0.tpack: 63
dev.ath.0.tpcts: 63
dev.ath.0.fftxqmin: 2
dev.ath.0.fftxqmax: 50
dev.ath.0.monpass: 24
dev.ath.0.wake: 0

ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:17:f2:50:66:16
        inet 10.0.0.6 netmask 0xffffff00 broadcast 10.0.0.255
        media: IEEE 802.11 Wireless Ethernet autoselect (OFDM/48Mbps)
        status: associated
        ssid cluelan channel 13 (2472 Mhz 11g) bssid 00:30:4f:55:f8:c6
        authmode WPA privacy ON deftxkey UNDEF TKIP 2:128-bit txpowmax 35
        bmiss 7 scanvalid 60 bgscan bgscanintvl 300 bgscanidle 250
        roam:rssi11g 14 roam:rate11g 5 protmode CTS burst roaming MANUAL
        bintval 100


--
Ian Freislich