[Solved] W5500 ignores "Wi-Fi" ARP request with padding

TCP/IP Chip W5500
1

Hi,

I’ve noticed that if I use the scheme PC-Ethernet-Router-Ethernet-W5500 (I) all comunication is OK, but on using PC-WiFi-Router-Ethernet-W5500 (II) all fails, even ping. Wireshark analyse showed, that in scheme II ARP packet has 18 padding bytes, and w5500 ignored these packets. I tried 2 development boards with w5500, with the same result. Please, advice what to do for getting reply for type II packets. Wireshark log and screenshots included.
Thanks.

1920×830 768 KB

1890×825 720 KB


packets capture.zip (707 Bytes)

2

Change MAC address of the device from 03:08:DC:00:AB:CD to, for example, 00:08:DC:00:AB:CD, and try again.

3

It works! Thanks :slight_smile:

4

Conclusion - bits 0 and 1 of the MSB of MAC address should be used with caution as they are reserved for special purposes: en.wikipedia.org/wiki/MAC_addre … _vs._local