Recently upgraded to Telstra Internet Fibre fibre direct 50/50 meg in Sydney Office and Melbourne office on NBN 25/5
Our previous connection was ADSL2+ in both locations with Telstra
VPN Connection Between these offices was created using two Cisco ISA500 series devices this connection worked successfullt for many years but the speed could no longer support the number of users and we upgraded.
The hardware is Telstra supplied basement Cisco switch and NBN standard NTD.
The Cisoc ISA500 series devices remain the same but the IPSec VPN uptime is appealing it goes up and down with great regularity on a daily basis.