Unable to connect to wireless adhoc/hotspot with Ubuntu 11.10

Solution 1:

1. Make sure connection network is available in your list. If not then enter these lines in terminal:

    sudo rfkill unblock all
   

   This one enable your wireless networking.

2. Edit connection > Select network which you want to connect and Edit. In IP section try manual for adhoc. For example:

   IP: 192.0.0.1
   netmask: 255.255.255.0
   gateway: 0.0.0.0

   and then connect your ad-hoc network

Solution 2:

Try this: Go to network connections -> Wireless choose the network you want to connect select edit->ipv6-settings->ignore

A technical note: We can use our wifi adapter (NIC) in four modes: managed, monitor, ad-hoc and Access Point(master).

Managed: It is the default mode. It helps us to connect to access points only. So if you are connected to AP it means your card is in managed mode.

Monitor: In this mode you don't connect to any of the networks but simply catch the packets in air. Usually used for hacking wifi passwords.

Ad-hoc: It is like a P2P connection. If two machines are connected via an ad-hoc connection both the machines should be in ad-hoc mode , using managed mode you can't connect to an ad-hoc but only access point.

Access Point: In this your card behaves like a router/access point. You need HostAP daemon to create an AP.

Now, if you can't create an ad-hoc connection this means your driver does not support ad-hoc mode and hence you can't connect to an ad-hoc network. But you should always be able to connect to an AP.