You can use the ftplib library to download the file from the ftp://ifconfig.me domain in Python like this:

```
import ftplib

ftp = ftplib.FTP('ifconfig.me')
ftp.login()
ftp.cwd('/')

filename = 'largedataset.csv'
with open(filename, 'wb') as f:
    ftp.retrbinary('RETR ' + filename, f.write)

ftp.quit()
```
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