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  1. #1
    Soundwave
    Member #
    7151
    Join Date
    Aug 2011
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    Red face Obtaining IP Address - WIFI issue - Possible fix

    Hi Guys,

    I have seen this problem a number of times now; i have been able to reproduce it with dlink routers. I know a lot of people have posted with the same issue. After some investigation, I believe whatís causing this issue is the dhcp server on the router. The TF connects first time and gets an address then once its dis-connected from the wireless network and re-connected it will request a new address the dhcp server ignores the request as it believes the tf already has the old address. Exactly what is happening here I have not had time to check with a sniffer. It seems to be something weird in the way the tf releases and requests the address with certain brands of routers (possibly the dhcp server implementation is custom for that brand router) a different dhcp server. This is why often a hard reset on the router works as it is deleting the dhcp address table. The current workaround I have used so far is setting the dhcp lease to a shorter time that way when the tf requests a address lease renew the old address should have already expired. Itís not a perfect solution as shorter dhcp lease causes more network traffic (and if you are playing a online game or using a cloud app it can momentarily lose its connection) but it will eliminate the obtaining ip address error till this is solved properly.
    I would have suggested the static ip address but it seems with wifi each time you disconnect and reconnect the static address needs to be re-entered. Can anyone confirm if the static address can be permanently remembered or is it just mt TF trying to make me insane

    I hope this helps at least someone out, itís a frustrating problem. I have currently set my lease to 10 minutes as I do travel and disconnect and reconnect a fair bit so this has solved my issues for the time being on the affected wifi networks I use.



  2. #2
    Soundwave
    Member #
    13370
    Join Date
    Oct 2011
    Posts
    2
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    0 times

    a fix for my Wrt54g router

    Hello,
    I had this issue me too after OTA to HTK75_WW_epad--8.6.5.13.
    When screen was off wifi was endless trying to reconnect.
    Closing the pad was fixing until new screen off.
    My router is an old WRT54G V24-sp2 mini
    I found this fix:
    Network mode: G-only (no n-mode with Wrt54g)
    ACK Timing 0 (Default value was 2000.)

    In this way no need to have DHCP time down.
    I really dont know what ACK timing is used for, but this give me a fix!
    Hope this help.
    Claude

  3. #3
    Supporting Member
    Supporting Member

    Member #
    44
    Join Date
    Apr 2011
    Location
    North Jersey-USA
    Tablet
    TF101
    Posts
    2,166
    Liked
    343 times
    Hello Claude and welcome to the forum. Thanks for sharing.
    Kgs Original Transformer with dock- rooted (TF 101)- USA

    nook & libre pro e-readers-asus vivobook- samsung orig. galaxy note- Galaxy Note 8- asus TF 101 and dock with 4.4 kitkat- Iphone 5s- galaxy Mega
    "Never be afraid to try, but always know where your back-up is when you screw up!"

  4. #4
    Soundwave
    Member #
    10605
    Join Date
    Sep 2011
    Location
    Argentina
    Posts
    28
    Liked
    3 times
    This happened to me sometimes in a public place, where I can't modify the router settings.

    I did not think about the DHCP settings of the router. Tomorrow I will try to modify the network settings in the TF if I have the same issue in this place...
    Android Devices:
    - Asus Transformer TF101 16 GB B70 w/Keyboard Dock B60
    - Motorola Milestone


  5. #5
    Soundwave
    Member #
    13370
    Join Date
    Oct 2011
    Posts
    2
    Liked
    0 times

    my fix with my wrt54g

    A day later i am not very confident with what i said yesterday
    Now sometimes i have to go in parameters, about pad, status,
    here i see no Ip address
    closing the popup seems connection to bind ?
    sorry,

 

 

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