MFC-5840CN FAQs & Troubleshooting MFC-5840CN Not your product? Sort by: Updated Date Popularity 3 Results 1. 03/25/2016 Discover the MAC address of the Brother network card 2. 01/08/2013 How do I know the current network configuration? 3. 06/29/2009 How do I factory reset the print server? Network Settings FAQs & Troubleshooting