MAC, IP, GT, SN information

Question

Hi everyone! Maybe this is a stupid questions, but I want to be sure about it. When you initialize W5500 you need to set net information. In mi case, I want to set as an static IP to understand its I use cmd-> ipconfig/all and cmd->arp -a to see my network information how it works. With arp -a I can see what IPs are being used, so I can choose one, and with ipconfig, I can see gw and sn, but I don’t sure about what MAC. I’m electronic student and I’m don’t know too much about ethernet nets. But I’m trying to learn Could someone help me please?

becky · Answer

What’s your question? The MAC address must have a unique address assigned by the IEEE for each device. Even if you use DHCP rather than static IP, you still need to set the MAC address.

becky · Answer

WIZnet can’t be a substitute for user’s MAC address. W5500 is a product without a MAC address. Should write a MAC address directly from the MCU. Refer to IEEE SA - IEEE Registration Authority

Glomumu · Answer

Hi! Thank you! This MAC could be a “random MAC”. I mean, following the standard. I’m right?

becky · Answer

No, MAC address must be allocated from IEEE. Mac address must have a unique number for each device, which is managed by the IEEE.

Glomumu · Answer

Hi becky, thanks for your response. To study and testing Wiznet, I could use a generated MAC, only for testing. If in the future, I want to sell a product with include W5500, it should have an unique MAC address, using for example, a dvice that provides that MAC, for example, Microchip device’s AT24MAC402. I’m right? Thank you in advance

becky · Answer

Yes, you need to buy mac address from IEEE or get other way. You can purchase the MAC address types MA-S, MA-M, and MA-L from the IEEE. image748×620 43.8 KB This is Registration Fees of MA-S. You can use a 28 Please refer to link. https://standards.ieee.org/products-services/regauth/oui36/index.html

Glomumu · Answer

OK Becky Thank you for helping me understand this topic.

Mxyxixptlick · Answer

If your W5500 is NOT sitting on the Internet with no router or firewall in between, you can give it a locally-administered MAC address that costs nothing. Just make sure it’s unique on your LAN. https://en.wikipedia.org/wiki/MAC_address#Universal_vs._local