4 Replies Latest reply: Nov 12, 2013 11:03 AM by AMBER93
AMBER93 Level 1 (0 points)

Using a Dlink wired router for 2 Mac Mini's.

works fine, but need to understand more about the IP address as having problems with a specific host server and changing the IP address should solve it

Comcast provides the connection. Do they issue the IP #?  If so, is it likely they can change it?


Or is there a way that restarting the router will cause it to automatically have a different number?


Another test option: at one time each mac mini was connected to the internet without the router. One at this physical location via Comcast. The other at a different physical location with a different internet provider. If the router is temporarily taken out of the connection to the Comcast internet connection, and one of them is directly attached to the Comcast Cable will their 'old' IP address be the one that is in use?


(Having a different IP will help show a hosting firm the problem is at their end (automatically rejecting a connect to a specific server, when it is possible to connect to a different server on their site  which is at MacHighway). For 10 days they've been saying it's my computer that is faulty, but I can FTP the exact same material created in Freeway Express 6.11 to a different MacHighway computer via a different user name and password.... Yet, they keep saying  they have "turned off the stop" that prevents the connect - but it never connects from the FTP attempt for it is automatically re-stopping the connect as shown with a FileZilla test). I calculate that changing the IP (that specific server is rejecting automatically) will finally get through to them to assign the hosting account to a different server - which I've proven I can connect into.)

Mac mini, Mac OS X (10.6.8), 1.83 GHz Intel Core Duo 2GB
  • BobHarris Level 6 (17,709 points)

    Comcast provides the connection. Do they issue the IP #?



    If so, is it likely they can change it?

    They will give you a static IP address if you pay for one.  Generally this involves getting a Business account connection.


    You can try disconnecting your Comcast cable modem from the cable for a few hours, and maybe Comcast will reassign the IP address you were using to another customer, and give you a new one, when you reconnect your Comcast cable modem back to the cable.  Then again, they may just give you the same IP address again, as they may have it locked to your cable modem's identifier.  Your mileage may vary.

  • AMBER93 Level 1 (0 points)

    Thanks for the reply.

    If I were not using a router, but had two different mac's and connected them alternately to Comcast. would the both have the same static IP address? 

    And if I added and connected a lap top would it also have the same IP address

    all because it is one common connect to Comcast?  and not the computer that is the determinent?

  • BobHarris Level 6 (17,709 points)

    Comcast provides the address.


    The address is not static, in the Internet sense of the term. But Comcast dynamically assigned IP addresses tend to be stable, until they are not.


    I do not know what Comcast uses to decide the address to assign to your cable location, nor what will make them reclaim the IP address and assign it to someone else.


    Since you have been direct connecting you Macs, you can check you assigned IP address via system preferences -> network -> Ethernet -> advanced -> TCP/IP, or use http://whatismyip.com, Google "my IP address"


    If you IP address does not change, then chances are Comcast uses your cable modem to identify your location, and is just reassigning the same stable IP address to you. Disconnecting the cable modem from the cable may cause Comcast to reclaim the IP address, or not.

  • AMBER93 Level 1 (0 points)

    Turned out that the problem was in the software Net Barrier from Intego.. where a special setting needed to be made to allow one to act as a 'server' to the other...After making that change any computer on the network could connect to any other.

    In hindsight, it is obvious it was a learning process at age 86