Cisco RV320 Configuraion for NBN

Wanting to swap out the Telstra Router for the RV320. THe settings are mostly pick up automatically but traffic issues develop with severe latency.

So the NBN connects directly to the RV320 and then to a SG200 series switch. Whilst I can resolve the host name i have no idea where to get the domain name.

I am also having issues with VOIP via the switch, geez Telstra don't make things easy.

Any assistance is appreciated.