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  1. Joined : Jul 2015
    Pacific Northwest, USA
    Posts : 310
    Win10 x64 Pro -2 desktops, 1 laptop
       12 Dec 2016 #11

    bro67 said: View Post
    Again you need to state what software you are using for Security, because yes it does matter. Being so cryptic and wanting to beat around the bush in trying to some how place all of this on Microsoft, when it is not always the case, is not going to change the fact that if you have a serious problem and want help, you have to do your part by putting in your post pertinent information, such as what Internet Security software that you are running on your computer.
    You've apparently missed the point of my posting. I'm not blaming Microsoft of anything. I'm not blaming the security software of anything, either. And I don't have the problem I mentioned or I'd do some experimenting myself.

    I saw the report of a problem that didn't make any sense, realized I didn't know what ipconfig /release and /renew actually do, and wanted to undo that ignorance. I've now done some experimentation, gained a little knowledge, and found that my ignorance was even greater than I supposed.

    The /release does have a significant side effect. Since it releases the IPv4 addrs (including default gateway and DNS servers) it obviously isolates the PC from the (IPv4) network. Windows reverts to Automatic Private IP Addressing (APIPA) and gives the adapter an addr in the APIPA range - 169.254.0.1 - 169.254.255.254. So even if the PC could communicate with the router it would no longer be on the router's subnet. This all goes back to normal with the /renew. (I expected Windows to start using a "public" network profile, but it does not.)

    The IPv6 addrs were not effected by any of this. Surprisingly, they were also not effected by /release6, but ISATAP tunneling shut down. Ipconfig /renew6 hung for a long time, and didn't seem to do anything except find an IPv6 DNS server ... and caused a complaint from the Teredo tunneling service.

    This probably makes sence to someone that really understands IPv6, but that's not me.
      My System SpecsSystem Spec


  2. Joined : Jul 2015
    Pacific Northwest, USA
    Posts : 310
    Win10 x64 Pro -2 desktops, 1 laptop
       12 Dec 2016 #12

    alphanumeric said: View Post
    ... What IP address you get the second time around depends on what your getting it from. If your router reserves an IP for each device based on its MAC address you'll just get the same IP again. If not it will be the next available one from the IP scope set on the router. If there is no reserving IP addresses its first come first serve. They are given out in order as each device asks for one, from lowest to highest in the scope set.
    Thank you. Our postings overlapped. I believe the DHCP server in my router reserves the IP addrs for (at least) the length of their lease - 24 hours. So if I disconnect and reconnect within 24 hours it will give the same address.
      My System SpecsSystem Spec


  3. Joined : Oct 2014
    Posts : 654
    Windows 7
       12 Dec 2016 #13

    Normally there should be no ill effects from releasing and renewing an IP address. Network communication is inherently unreliable and properly designed software will handle any temporary disruptions this may cause.
      My System SpecsSystem Spec


  4. Joined : May 2015
    Central IL
    Posts : 3,068
    EL Capitan
       12 Dec 2016 #14

    pokeefe0001 said: View Post
    You've apparently missed the point of my posting. I'm not blaming Microsoft of anything. I'm not blaming the security software of anything, either. And I don't have the problem I mentioned or I'd do some experimenting myself.

    I saw the report of a problem that didn't make any sense, realized I didn't know what ipconfig /release and /renew actually do, and wanted to undo that ignorance. I've now done some experimentation, gained a little knowledge, and found that my ignorance was even greater than I supposed.

    The /release does have a significant side effect. Since it releases the IPv4 addrs (including default gateway and DNS servers) it obviously isolates the PC from the (IPv4) network. Windows reverts to Automatic Private IP Addressing (APIPA) and gives the adapter an addr in the APIPA range - 169.254.0.1 - 169.254.255.254. So even if the PC could communicate with the router it would no longer be on the router's subnet. This all goes back to normal with the /renew. (I expected Windows to start using a "public" network profile, but it does not.)

    The IPv6 addrs were not effected by any of this. Surprisingly, they were also not effected by /release6, but ISATAP tunneling shut down. Ipconfig /renew6 hung for a long time, and didn't seem to do anything except find an IPv6 DNS server ... and caused a complaint from the Teredo tunneling service.

    This probably makes sence to someone that really understands IPv6, but that's not me.
    Again the only one missing the point here is you. So what is this widely known Security Software, that there are only about 20 or so different Security suites out there and none of them have anything to do with Windows, same as Windows has nothing to do with them. Also a 169 IP just means that the Ethernet NIC did not get a real IP and still has nothing to do with Windows or some unclaimed Security software.

    The fact remains that you are being so cryptic about your original post, we can all take it that you just wanted to raise your post count for no reason at all.
      My System SpecsSystem Spec


  5. Joined : May 2015
    Central IL
    Posts : 3,068
    EL Capitan
       12 Dec 2016 #15

    pokeefe0001 said: View Post
    Thank you. Our postings overlapped. I believe the DHCP server in my router reserves the IP addrs for (at least) the length of their lease - 24 hours. So if I disconnect and reconnect within 24 hours it will give the same address.
    All modern day Gateways reserve a lease up to 24 hours, unless your either do a hard reset or reboot it. Some even go as far as reserving them longer if the MAC ID of the device matches a IP in IPTables that was used up to 30 days prior.
      My System SpecsSystem Spec


 
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