SonicWALL with private IP on X1 WAN port

Networking isn't my specialty, it's more like my weak spot.  I came across this setup in which they are using a SonicWALL T100-W for their router/firewall, DNS/DHCP is handled by Server 2008R2 ADDS.

In the SonicWALL the WAN port X1 has a private IP address.  I can see via the ARP cache within the SonicWALL the private IP belongs to a Juniper device.

They get their Internet through their VoIP provider.

I tried copying the port forwarding that already exists and works for port 443 which is used by Exchange 2010.

I even tried using the pubic server wizard to no avail.  I want to know why the IP on the X1 port is a private IP address.  Also I am trying to setup OpenVPN but like I said I can't hit it from the outside at all.  I have a weird feeling there's something in front of that SonicWALL but I already contacted the ISP and they said they don't do any type of port forwarding so I am guessing it just passes the traffic directly onto the SonicWALL?
NerdfaceKillahAsked:
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nappy_dThere are a 1000 ways to skin the technology cat.Commented:
This is because the ISP modem is not in passthrough mode. Contact your ISP and request they put your internet modem into passthrough mode. This will allow your sonicwall to get an IP address that is public instead of the class C non routable IP and also allow proper L2TP or IPSec VPN to work.
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NerdfaceKillahAuthor Commented:
Come to find out that the ISP actually does have a firewall service for client.  I had them forward the ports and now it is working properly.
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NerdfaceKillahAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for NerdfaceKillah's comment #a40244754
Assisted answer: 500 points for nappy_d's comment #a40221903

for the following reason:

Thank you
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nappy_dThere are a 1000 ways to skin the technology cat.Commented:
Hi, I think my comment should be awarded fulfill points as I was spot on with the resolution.
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NerdfaceKillahAuthor Commented:
It actually is 500 points nothing goes to me.

I've requested that this question be closed as follows:

 Accepted answer: 0 points for NerdfaceKillah's comment #a40244754
 Assisted answer: 500 points for nappy_d's comment #a40221903

 for the following reason:

 Thank you
0
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