BSNL Nokia-Siemens H640V-G25E won't connect to the internet after trying to log in with an unregistered device.

Did you configure the VLAN on your main router?
 
If you were configuring the VLAN in the original ONT then you'd need to do the same here too. If you router doesn't support VLANs then that would be a problem.

Unless the BSNL internet VLAN is set as the default VLAN.
 
Definitely wasn't configuring VLAN in the original ONT either, there wasn't even a VLAN option in the original ONT. Does the default VLAN have a set value or does it change from SDO to SDO?
 
Alright, then it should be fine. Looks like they have set the default VLAN to the BSNL internet VLAN.

For me, my LCO provides internet service from BSNL and another local ISP plus TV services etc through the same fiber infea. So the VLANs for each service differ and BSNL also isn't configured as the default. So have to specify the VLAN in my case.

Yes, it would vary with the location and the implementation.
 



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