I have the following Wireless adaptor Intel Corporation Centrino Ultimate-N 6300 (rev 35) Ever since I installed Ubuntu 11.10, I am unable to connect to an ad-hoc network. I assume it is not getting the ip address. Anybody with the same Wireless adaptor facing this issue on Ubuntu 11.10 (Shell) ? This used to work perfectly in Ubuntu 11.04.
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.