Sonicwall TZ105 WAN Interface gets private ip address?

I have a new Sonicwall TZ-105 firewall appliance which will be on a small office network and will participate in a site-site VPN.  The WAN interface is set to acquire an address via DHCP from the attached cable modem.   When I look at the configuration of the firewall, the LAN port has an IP of  The WAN interface has an ip address of and I can't figure out where that is coming from.  If I go to it gives me a correct public ip address and everything appears to function normally even with a private IP on the WAN interface.  Because the WAN port has a private IP, I can't manage the device over the Internet, do any port forwarding nor connect it to the VPN.  Why is the sonicwall giving the WAN interface a private IP address?  Does it need to be in some other mode?  I believe I chose the default setting, which was WAN/LAN switch.
Steve BantzIT ManagerAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Henk van AchterbergSr. Technical ConsultantCommented:
Your cable modem is probably a router which is also performing NAT and thus giving you a private IP.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Steve BantzIT ManagerAuthor Commented:
Good call.  The model of cable modem provided was a combination modem/router/wireless access point.  The cable company had to put it in bridge mode so it would pass the public IP directly to the WAN interface.  I was unaware that the cable modem was anything but a run of the mill device.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Hardware Firewalls

From novice to tech pro — start learning today.