How can I get mac address？

[SpicyChicken1010]

if I don't know the mac address,how can i encapsulate packet.
Arp request is designed for getting dst mac address,sending arp request is the network interface's responsibility,how can i make network interface to do this work for me？

[su-404]

You can obtain the MAC address of the gateway to facilitate contracting.

[gaoxingliang]

@SpicyChicken1010 you can refer https://github.com/gaoxingliang/mac-address-detector-java