Please follow this step-by-step guide to enable DNS for private APN
Connect to router web interface
2. Under administration enable remote SSH. Normally it is available on port 2222
3. Start putty and connect to router IP and port 2222
4.login with root and password. The default admin login is: admin01
5. Open configuration file for editing with command: vi /etc/config/dhcp
6. When the configuration file is opened with text editor you must add or delete qoutes around values
If there are no quotes around values:
:%s/option rebind_protection 1/option rebind_protection 0/g
If there are quotes around values:
:%s/option rebind_protection '1'/option rebind_protection '0'/g
7. Save file with command: :wq
8. After you save the changes to the configuration file you need to reboot Teltonika. You can do it simply by typing in the command: reboot