code: func (*protocol) ResolveStaticAddress(addr tcpip.Address) (tcpip.LinkAddress, bool) {
  	if addr == header.IPv4Broadcast {
  		return broadcastMAC, true
  	}
  	if header.IsV4MulticastAddress(addr) {
  		// RFC 1112 Host Extensions for IP Multicasting
  		//
  		// 6.4. Extensions to an Ethernet Local Network Module:
  		//
  		// An IP host group address is mapped to an Ethernet multicast
  		// address by placing the low-order 23-bits of the IP address
  		// into the low-order 23 bits of the Ethernet multicast address
  		// 01-00-5E-00-00-00 (hex).
  		return tcpip.LinkAddress([]byte{
  			0x01,
  			0x00,
  			0x5e,
  			addr[header.IPv4AddressSize-3] & 0x7f,
  			addr[header.IPv4AddressSize-2],
  			addr[header.IPv4AddressSize-1],
  		}), true
  	}
  	return "", false
  }
docs: // ResolveStaticAddress implements stack.LinkAddressResolver.