VPN Issue on Bridge Mode

[bk~]

I have problem in Cisco AnyConnect VPN particularly when I put the ONU( HG323RGW ) in the bridge mode and connect with the MiR3. The VPN connects successfully but I can't access internet saying DNS_PROBE_FAILED. When I tried to ping 1.1.1.1 it's working but can't browse anything. But I did not face any such problem if I disable bridge and directly connects to the HG323RGW using Ethernet/Wi-Fi.
Will provide if any more details needed.

 

[varkey]

I don't think it has to do with the bridge mode. Does the VPN server enforce you to use any specific DNS resolver?

 

[bk~]

There was no option to specify DNS in the VPN Client.
The connection works properly in Jio Hotspot and without using the bridge Mode.
If I use my MiR3 in dump AP/router with the ONU it is working perfectly. Also checked the MTU but could not figure out the issue.