====== DynDNS/Remote Access Problems ======
A common problem mobile networks is that depending on the SIM cards type the router can't be accessed even a service like //DynDNS// and //port forwarding// is used.
This problem has nothing todo with the router functionality because it is a general problem with IP networks. In most case the terms static(fixed)/dynamic are mixed up with public/private IP addresses.

Most likely the SIM card has a //dynamic// but only a **private** IP address and it will not work.
For using //DynDNS// or //port forwarding// you need a **public** IP address.

//Port forwarding// will not working because the NetModule router is behing a second router of the mobile operator. Port forwarding in the NetModule router will not solve this because you also would need the port forwarding of the mobile operators router. //DynDNS// will also not work because the NetModule will get a //private// IP which can't be accessed from the internet.

IP address types have two dimensions which are independent:
   * **Static** means the IP address never changes as long as you stay with the same provider or same server. (Fixed IP)
  * **Dynamic** means the IP address can change from time-to-time.
vs.
  * **Public** means the IP address can be visited from any computer in the world.
  * **Private** means the IP address can only be used by those on the same network. 

Private addresses are not routed an the ranges are: 
  * 10.0.0.0 - 10.255.255.255
  * 172.16.0.0 - 172.31.255.255
  * 192.168.0.0 - 192.168.255.255

Please check if the IP address of the router in the mobile network is in the range of a **private** IP address:
{{:faq:wwanaddress1.png|}}

If the router has an **private** IP address remote access with port forwarding will not work. If you need remote access you can use an external VPN Server like the Netmodule NB1600-R Wireline or CloudRouter. See: {{:configuration:the_m2m_cook_book.pdf|Setting up an OpenVPN Server}} and 
{{:configuration:netmodule_remote_access_solutions.pdf|Remote access solutions}}.

Using services like //whatsmyip.com// will show you another address which is the address of the router of the mobile operator. 

This is the same situation like having a private DSL-Router (= operators router) at home which has a public and often dynamic (e.g. 79.4.3.2) IP. Local computers (= NetModule router) can't be reached from the Internet because they have a private IPs (e.g. 192.168.1.100). All local routers will report the same public IP if //whatsmyip// is used (79.4.3.2). But looking on the IP address of the computers it will show the private addresses (192.168.1.100).