ARP problem.

Hello,

I'm trying to correct firmware for Edimax BR-6204Wg WiFi/router ->
RTL-8186(MIPS 4Kc), 2M flash / 16M RAM, kernel 2.4.18.

My config is:

--------------
| Edimax |
| |
--------------
| |
WiFi |
|
|
--------------
| Switch |
--------------
|
WiFi |
--|------------
| PC |
--------------

Adressing: LAN is 192.168.1.0/24 WiFi is 192.168.2.0/24.
Edimax is Wireless ISP mode.

Problem: when I try to send something (ex ping) from Edimax to PC THRU
WiFi, at the beginning it works. After ARP times out, response is "no
response from PC". /proc/net/arp shows PC IP addr with zeros (unresloved
AFAIK).

If then I issue ex ping from PC -> ARP becomes valid, ping works.

Question: where to look to try to solve this? Does IPTABLES on PC in
some kind blocks ARP? (as it name suggests it shouldn't). On PC I have
full normal "toolkit", but on Edimax my tools are VERY limited.

Anyone has ideas??

W.P.

Użytkownik W.P. napisał:
> Hello,
>
> I'm trying to correct firmware for Edimax BR-6204Wg WiFi/router ->
> RTL-8186(MIPS 4Kc), 2M flash / 16M RAM, kernel 2.4.18.
>
> My config is:
>
> --------------
> | Edimax |
> | |
> --------------
> | |
> WiFi |
> |
> |
> --------------
> | Switch |
> --------------
> |
> WiFi |
> --|------------
> | PC |
> --------------
>
> Adressing: LAN is 192.168.1.0/24 WiFi is 192.168.2.0/24.
> Edimax is Wireless ISP mode.
>
> Problem: when I try to send something (ex ping) from Edimax to PC THRU
> WiFi, at the beginning it works. After ARP times out, response is "no
> response from PC". /proc/net/arp shows PC IP addr with zeros (unresloved
> AFAIK).
>
> If then I issue ex ping from PC -> ARP becomes valid, ping works.
>
> Question: where to look to try to solve this? Does IPTABLES on PC in
> some kind blocks ARP? (as it name suggests it shouldn't). On PC I have
> full normal "toolkit", but on Edimax my tools are VERY limited.
>
> Anyone has ideas??
>
> W.P.

Problem was with network driver: it seems that the one located in
/kernel/rtl8186 (rtl8186.o file, small: 17K) is buggy. When changed to
driver in /kernel/drivers/net/rtl8186.o (a big one 195K) problem with
ARP is gone. Switching drivers is mage by kernel .config:

CONFIG_DRIVER_SPEEDUP=n
DRIVER_SPEEDUP=n

in network drivers -> Realtek section.

W.P.