ESP32 Forum

Hi
for a project I'm working, I'm intercepting incoming WIFI traffic with esp_wifi_internal_reg_rxcb.
I have noticed in WIFI STA mode, only the packets for the DST-MAC = ESP32 wifi sta mac are forwarded to the callback.
The problem I have is that ARP packets entering the ESP32 WIFI are not being sent to the callback function.
I'm working on a PROXY-ARP function so I need to catch the incoming ARP packets which don't reach the my callback function. In WIFI AP mode it works but I need it to work in WIFI STA mode.

Is there any low level callback function to intercept ARP packets? I have digging into lwip etharp and it seems low level wifi functions connects to etharp then it forward packets but ARP.

Thanks
Antonio

Not sure if an ARP packet would be forwarded to other stations by an AP/router in the first place, when the AP itself can provide the answer.

May be I didn't explain correctly as I'm not English speaker.

When an ARP packet is sent from the a WIFI AP to the ESP32 (WIFI STA), it seems to be processed a etherarp task which seems hooked between the wifi driver and the lwip tcp/ip stack.

If I intercept the received packets from the wifi driver with the "esp_wifi_internal_reg_rxcb" function, the ARP packets are not arriving to my function so I guess the etherarp task which resolves ARPs is between the wifi driver and my function.

The question is Can I intercept the received wifi packets at some other point which let me receive the ARP packets?

Regards
Antonio

So we're talking about ARP responses?