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  1. #1
    Senior Member
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    No WiFi on phone.

    Problem:

    I recently noticed my android phone (Samsung Galaxy) wasn’t connecting to my preferred internet connection. After a couple of hours scrolling through the internet trying out various “fixes”, none of which worked I took a stab at it myself. This is what I found:

    Android device (Samsung Galaxy S5) does not connect to internet. Message: “AP currently not in use. Internet connection too slow.” then “Failed to obtain I.P. Address”. It was this second message that gave me my clue.

    My setup: I use a Netgear WiFi extender. Connection directly to the router is fine, however connection through the extender fails for some devices.

    Diagnosis:

    There seems to be a problem with DHCP automatically allocating I.P. Addresses to some Android devices. Why this is so I have no idea. I have tried (both on the phone and the extender) powering off and on, upgrading to the latest firmware and resetting to defaults all to no avail. However there is a solution.

    Solution:

    Set your device to use a static I.P. address. This is, of course, not optimal especially when in an environment where guests may be trying to connect, like in a bar or restaurant. It’s more of a sticking plaster really although businesses often prefer this method to enable them to identify particular machines. Nevertheless it works.

    Method:

    The first step is to find a working I.P. address. If you have another device that connects correctly you can use that. For example, if you have a connected P.C., click on the WiFi connections in the bottom bar. It should show your connection with the word “Properties” underlined, click on the word. This should bring up a properties screen (surprise surprise). Scroll to near the bottom to where you can see “IPv4 address”. This is your starting point.

    It takes the form of four sets of digits separated with periods: “192.168.0.23” or some such. This is a “local” I.P. address, i.e. relevant to your home network and shouldn’t be confused with your internet I.P. address which will take a similar form but the numbers will be different. Confusing? Don’t worry about it.

    Now, on your Android device, try to connect to the failing connection. After a minute or two you get the “AP currently in use” message. Underneath that there will be three options: retry, cancel and forget. Click forget.

    Then touch/click on the connection again. It will ask you for the password to the connection so type this in, but don’t hit connect. Instead there should be another option “Show advanced options” with a checkbox. Select this checkbox. You should then be able to scroll down. Do this and select “DHCP”, then select “Static”.

    Under I.P. address enter the number you found earlier, e.g. 192.168.0.23 except for the last group (in this case 23) you need to change this to a unique number greater than 1 and under 128. By unique I mean not used by another device. How do you know? Well, if you don’t have the ability to check then trial and error will have to do.

    So, the number you enter should be something like “192.168.0.64”

    Underneath this you will see “Gateway”. This should be the same set of numbers except the last number should be “1”.

    So, the number you enter should be something like “192.168.0.1”

    Then hit connect. Hey presto your internet is working.

    I know there are a number of members here with a much greater knowledge of networking than I have, so if you have noticed any mistakes in my solution, or if you have tried this and it didn’t work, please let me know.

    I also noticed that the default Gateway on my Samsung was 192.168.1.1 when it needed to be 192.168.0.1. and maybe this is the source of the problem.
    "Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." - Benjamin Franklin

  2. #2
    Senior Member rkspsm's Avatar
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    Re: No WiFi on phone.

    I like static IPs ... DHCP has given me problems too. In my home router, I have configured my routers DHCP to always give a fixed IP based on my MAC address, which happens to belong to my desktop. This has the advantage that on my desktop I can safely assume a static IP because no other device on my router's wifi network will ever be given that address (unless someone is trying something sneaky and modifies the MAC address of his device to match my desktop's MAC address).

    Also, regarding 192.168.1.1 vs 192.168.0.1, yeah this is one of the common issues, both are very popular by convention in private networks. But its just a convention, an IP address with 192.168.0.64 CAN exist on a network with gateway 192.168.1.1, it will only require that subnet mask be 255.255.0.0 instead of the conventional 255.255.255.0 (I am oversimplifying, its slightly incorrect in the sense, that there can be many other subnets satisfying the requirement).

    The number of 255s (actually number 1s in binary notation), determines what part of 192.168.x.y is considered network address. If subnet mask is 255.255.255.0, then 192.168.x is the network address, which means 192.168.0.64 and 192.168.1.1 are on different networks (192.168.1._ vs 192.168.0._). The gateway is just the device on the network, the other devices talk to when they need to talk to devices on other networks.
    "Truth is enough." - Curt Doolittle
    "Truth, and violence to enforce it." - Eli Harman


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