@Shikinami
I have not set anything particular to make the vpn working. And I noticed that the HW NAT is enabled.
The only additional setting made are the port forwarding for emule.
Sorry for late reply.
I can confrim that with this new version of firmware 1.0.1.4m the AT&T IBM vpn connection (for example) is now working perfect, when before hangs constantly.
And that the browser navigation on the net when before hangs the first time you connect to a site and after a minute or so goes smooth...