Sonicwall NSA 220 vpn issue

Hi All, I'm trying to set up a tunnel VPN connection with a third party and I'm having trouble. I am pretty sure the connection details are correct but i'm having trouble configuring the VPN to present itself as one of my static WAN IP's.  
I have 4 static addresses, and 1 WAN interface.  When I initiate the VPN connection, the sonicwall begins the authentication process, but from the wrong external IP, thus it error's out.  
I can't see a way of forcing this VPN to use a particular WAN IP for initiating VPN connections, and have tried routing and NAT rules without success.

Any ideas?
jonny lightfootAsked:
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It seems you have multiple WAN interfaces, SonicWALL chooses the Primary WAN interface IP while sourcing a VPN connection.
jonny lightfootAuthor Commented:
Yes that looks to be the issue.  I can't change the default WAN easily due to other firewall rules in place, so in a perfect world I'd just like to change the IP the VPN want's to use on default.
JohnBusiness Consultant (Owner)Commented:
It is likely that the SonicWall VPN is using the External IP address that is registered in the Setup area of the SonicWall. Is this true?  That is the way my Cisco routers are configured.

If this is true, you may not be able to change it.

1. Are you able to use the IP address known to the Sonic Wall?
2. Can you change the Sonic Wall setup to use a different external IP address?
jonny lightfootAuthor Commented:
HI All,
Got it sorted by creating a site to site VPN instead.

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jonny lightfootAuthor Commented:
Job done
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