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Remote access vpn setup behind ADSL router

HI Everyone, 

Need some assistance with configuration setup for remote access.

I have and an ADSL router which unfortunately won't operate in "modem" mode, my UTM is behind this, in line, so the external address is nat'd on the firewall.

I have enabled the L2TP config and downloaded the config to my phone. The ADSL router is passing through traffic to the firewall.

When I make a connection I can talk to the firewall but the negotiation fails. I was wondering do I need a NAT rule or a masquerading rule to allow two way conversation from the firewall?

regards


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