TG582n + Mac VPN (L2TP)

[#1]

I have configured the ports to forward (500, 1701, 4500) from the internet to my mac. As far as I can see this is exactly the same as my old O2 router config - yet I can't make a VPN connection while I'm roaming. I don't even get logs on the router about the connection attempt...?
It works when I assign the mac to the DMZ - but I'm sure I don't want this a a solution.
So, my questions are:
- should port-forwarding be enough to enable the VPN?
- do I need to configure the router via the command line (I read other posts that talk of unbinding stuff? but these don't seem to be the same type of VPN)
- do I need to use the DMZ - don't really want this...
Many thanks,
Derek
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Edit: my firewall is turned off in the plus.net firewall config.

[#2]

Quote

do I need to configure the router via the command line (I read other posts that talk of unbinding stuff? but these don't seem to be the same type of VPN)

IPSec is commonly used in association with L2TP so I would suggest trying the unbind of ike & esp

[#3]

Thanks MisterW!
I'll try that when I get back.