WiFi internet spojenie zlihava - preco?

Zdravim. Mam nasledujuci problem.
Sme traja napojeny cez router (OS Linux) v ktorom je WiFi karta na internet. Ked zapnem router, prebehnu inicializacne skripty - nastavenie firewallu sa spusta z rc.local, potom ide internet. Cez den po cca. po minute zliha spojenie. V noci vydrzi aj pol hodinu. Po spusteni rc.local - teda po inicializovani sa zasa rozbehne ale iba na nejaky cas, potom zase zliha spojenie. Mate nejaku predstavu cim to moze byt?

hromada různých možností -rušení, vadná karta, OS ...
jak je to připojeno do netu přes Wifi ?

Pozri vypis z programu dmesg a logy (/var/log).

Robi to cca. 3-4 dni dozadu, dovtedy siel v pohode. Pripojenie cez NAT.
No v logoch neviem co mam pozerat, ktory log? Nevidim tam nic uzitocne na toto. V noci ide lepsie - dlhsie intervaly medzi spadnutim.

iwconfig hadze toto:

v cca 1/3(niekedy lepsie, niekedy horsie) alebo aj viac (1/2 , 2/3) spusteni prikazu toto:

wlan0 v0.2.0pre3 ESSID:"GutaOmni"
Mode:Managed Channel:3 Access Point: 00:02:2D:3B:D3:19
Bit Rate=11Mb/s Tx-Power:18 dBm
Encryption key:off
Link Quality:75/100 Signal level:34/100 Noise level:25/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

a v cc 2/3 toto:

wlan0 v0.2.0pre3 ESSID:"GutaOmni"
Mode:Managed Channel:3 Access Point: 00:02:2D:3B:D3:19
Bit Rate=11Mb/s Tx-Power:18 dBm
Encryption key:off
Link Quality:100/100 Signal level:35/100 Noise level:0/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

a obcas toto:

wlan0 v0.2.0pre3 ESSID:"GutaOmni"
Mode:Managed Channel:3 Access Point: 00:02:2D:3B:D3:19
Bit Rate=11Mb/s Tx-Power:18 dBm
Encryption key:off
Link Quality:100 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

Napisal som maly skript. Riadky sa vypisuju kazdu sekundu. Hodnota je link quality - teda:
100 - noise = link_quality.
Tu je kusok z vystupu:

100 ==================================================
100 ==================================================
100 ==================================================
100 ==================================================
100 ==================================================
81 ========================================
80 ========================================
100 ==================================================
100 ==================================================
100 ==================================================
84 ==========================================
100 ==================================================
100 ==================================================
80 ========================================
100 ==================================================
100 ==================================================
100 ==================================================
100 ==================================================
83 =========================================
100 ==================================================
100 ==================================================
100 ==================================================
100 ==================================================
100 ==================================================
79 =======================================
100 ==================================================
78 =======================================
100 ==================================================
100 ==================================================
80 ========================================
100 ==================================================
==================================================
81 ========================================
81 ========================================

No ...
Updatol som driver wifi karty. Pribudla moznost nastavit retry parameter v iwconfigu, ktory som nastavil na 32. Sice neviem presne co to sposobi, alebo na co je ten parameter dobry. Vie niekto? Pomoze mi to?

Vyzera to, ze spojenie pada, ked je velky noise level dlhsi cas (cca 10 sekund). Teraz v noci je signal znacne cisty, velmi zriedka sa vykytuje noise a spojenie je stabilne. Uvidim co bude cez den.

No ja mam Link quality momentalne najviac 22/92. Pada mi to len ked to klesa na nulu.
Aku tam mas kartu?

Mam kartu SMC2402W.
Zatial sa zda sa ze novy driver vyresil problem, lebo uz 9 hodin stahujem bez toho, aby ma odpojilo. Spozoroval som dlhsi interval vacsieho noisu, kedy sa na par sekund zastavil traffic, ale spojenie sa vratilo po uplynuti tej doby a nemusel som spustat nastavovaci skript wlan spojenia. Neviem ci za to mozem dakovat opravam v driveri alebo parametru retry, ktory som nastavil na 32.

Pouzivam driver:
Open-Source wireless driver for TI ACX100 chipset
http://acx100.sourceforge.net

A changelog od verzie 0.2.0pre3, ktory som pouzival doteraz vyzera:

2003.11.16 - 0.2.0pre6 released
- fix kernel OOPS on driver init failure
- add support for new wireless extension ioctl implementation format,
move set_retry from iwpriv to standard ioctl
- add support for scanning ioctls (needed for apradar etc.)
- add /proc entry for acx100
- change iwconfig name from driver version to 802.11 ID string,
move driver version into default nick name
- change channel in start_net to a non-overlapping channel
- add human-readable ACX100 explanations for reasons of failure codes
- don't try to modify Tx level for unknown radio types
- fix compiler warnings
- README updates
- remove unnecessary includes

2003.11.07 - 0.2.0pre5 released
- fix problem causing all sorts of machine lockups:
implemented centralized card settings management
- changed net queue mechanism to avoid netdev watchdog timeout messages
- initial ACX100 USB (DWL-120+) firmware loading support
- enable EXPERIMENTAL_VER_0_3 features by default now:
- replace CPU-burning loops by scheduled delays / faster timing loops
- radio Tx level phy setting
- show error when loading empty firmware file
- fix crash in acx100_probe_pci() on error cleanup
- PowerPC compile fixes (WIP)
- small fixes in start_net
- HUGE README update
- remove many unneeded header file includes
- added crashme script for stability testing

2003.10.07 - 0.2.0pre4 released
- fix for APs with hidden ESSID: make sure we use user configured ESSID here
- fix Tx ring buffer overflow
- probable fix for deauthen packet receiving resulting in dropped link
- fix module unload crash uncovered by card hotplug functionality
- show current network mode only after getting associated
- slight optimizations
- card EEPROM ID cleanup
- improve README