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Thread: automatic IP address

  1. #1
    Join Date
    Jun 2008
    Beans
    87

    automatic IP address

    When I use an automatic network configuration under ubuntu, dhcp returns somethink like 89.136....but under windows returns something like 83.103...
    Only the last one really work. I could not understand why dhcp returns two different addresses from the some isp. Is there anyone that could offer me some informations on that?
    Things are getting more interesting when I see that under Windows, there are blocked connections attempts by firewall on address 89.136...even that the current IP is 83.103...
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  2. #2
    Join Date
    May 2008
    Beans
    24

    Re: automatic IP address

    It's entirely feasible that you get different IPs under Linux and Windows due to the way that DHCP works. The fact that the networks vary so much is an artifact of large scale cable deployments and is not a concern by itself.

    Blocked connections on your windows firewall are not at all uncommon, from any source address. There may be more connections TO your other address if your ISP's aggregation router still has an ARP entry for your other IP address. The router may not know that you've changed IPs and will continue to send packets to you until it's ARP entry expires.
    Last edited by yogensha; October 10th, 2008 at 10:34 PM. Reason: Minor grammatical faux pas.

  3. #3
    Join Date
    Jun 2008
    Beans
    87

    Re: automatic IP address

    Thanks for your reply yogensha. How ever, my problem is that the address that I get under Ubuntu is not working, I mean the renewal of IP it seems not working well.

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