Hello
This is the same issue discussed in this Whirlpool thread,
https://forums.whirlpool.net.au/forum-replies.cfm?t=2475327
and here
https://forums.whirlpool.net.au/forum/index.cfm?action=reply&t=2496981
It is the same issue I have reported here, without recent response despite my recent comments,
It is the same issue reported here,
Yet the problem persists for many people.
I have reported the problem at length to Telstra tech support a number of times, each time having to repeat the problem from the start. I keep being told the problem has been escalated, but there appears to be no fix in site.
The level 1 Bigpond tech support are completely incapable of understanding the problem, or even the basic concepts involved.
As soon as you mention server / port forward / VPN, they immediately revert to their script of "Telstra does not support this, we must direct you to Telstra Platinum..."
This problem has arised directly following the recent cable upgrades, and is preventing certain cable customers from making any form of direct connection between them.
From the discussion on Whirlpool, it appears to be a bad configuration in the upgraded Cable Modem Termination Systems (CMTS) related to ARP Proxying.
If anyone at Telstra is actually reading this, could you please refer all this information up the chain to someone who actually understands the problem and has access to the technicians who can actually fix this.
To anyone else having this problem, I suggest you demand that the problem be escalated. The tech support are reluctant to escalate something when they can just follow their script to force you into Telstra Platinum.
This is definitely a Telstra configuation problem, and not a problem with anyone's modem / firewall / port forward etc and you should demand that the problem be properly considered and referred up the chain to someone who actually understands what you are talking about.