3 Replies Latest reply: Sep 23, 2011 2:35 PM by mariaL RSS

Dynamic Public IP address ?


Hi is there such a thing as a dynamic public IP address, the idea being that I want my device in a remote location to register its dynamically assigned public IP address as a client and then listen in as a server for incoming data as a server for sockets connecting to that IP .

I assume that if the modem is to be connected as a server it requires a public IP adress.



  • Re: Dynamic Public IP address ?

    Dynamic IP addresses are most frequently assigned on LANs and broadband networks by Dynamic Host Configuration Protocol (DHCP) servers. They are used because it avoids the administrative burden of assigning specific static addresses to each device on a network. It also allows many devices to share limited address space on a network if only some of them will be online at a particular time. In most current desktop operating systems, dynamic IP configuration is enabled by default so that a user does not need to manually enter any settings to connect to a network with a DHCP server. DHCP is not the only technology used to assign dynamic IP addresses. Dialup and some broadband networks use dynamic address features of the Point-to-Point Protocol.


    Sticky dynamic IP address

    A sticky dynamic IP address is an informal term used by cable and DSL Internet access subscribers to describe a dynamically assigned IP address that seldom changes. The addresses are usually assigned with the DHCP protocol. Since the modems are usually powered-on for extended periods of time, the address leases are usually set to long periods and simply renewed upon expiration. If a modem is turned off and powered up again before the next expiration of the address lease, it will most likely receive the same IP address.

  • Re: Dynamic Public IP address ?

    Registering your assigned upon connection IP-address to a dynamic DNS server like dyndns.org will work using the very same technology as used in fixed line modems. If your device will be accessible from the outside world will depend on other factors like if incoming traffic is permitted by the network operator. As it is not necessarily in the MNOs (mobile network operator) interest to have devices acting as a server online in their networks all the time it may not be supported at all unless you opt in for special M2M tariff/rate that in many cases provides a fixed IP address within a mobile VPN (virtual private network) anyway.


    And wehen planning to keep a device connected over an extended period of time, think of variable session time-out thresholds on different networks that will terminate the connection if you don't keep the connection active by sending a heartbeat every few minutes. In order to not create a misbehaving application that may consume irresponsible amounds of bandwith or too much signaling on the mobile network, please get in touch with your MNO's M2M competence center in an early development state.

  • Re: Dynamic Public IP address ?

    Hi Aley,


    What kind of device do you want to work with?


    We provide M2M-710D which is a remote maintenance device that solves the problem of having to use a Static IP.  You can use one as a client at a remote location and then one at your location as a server.  These can be configured as a pair and can allow you to access your remote devices through firewalls.  You can configure them with a web browser.  You can use multiple clients and use the same M2M-710D server device with many of the M2M-710D client devices.  The solution uses a DDNS Service.


    M2M-710D: $289.00  Remote Maintenance with serial streaming Solution




    User's Manual: http://www.icpdas-usa.com/documents/m2m-710duser%20manual-env1.01.pdf


    Best Regards,


    Maria Lemone

    ICP DAS USA, Inc.

    1-888-971-9888 ext 105