LinuxQuestions.org - wi-fi stopped working after nfs installation

I have managed to connect my desktop (kubuntu 9.04, 2.6.28-11-generic kernel with D-Link DWA 110 usb Wi-Fi adapter) to a Acer Timeline 4810G laptop (ubuntu 9.04). All went OK till this morning I installed nfs on both systems.

Now I can see from the laptop the network created on my desktop (via iwlist), but after I try to connect to it (iwconfig wlan0 essid _my_essid_) ping of my desktop returns

Code:

From 192.168.1.1 icmp_seq=6 Destination Host Unreachable

dmesg | grep wlan returns now

Code:

[ 3502.027059] wlan0: Trigger new scan to find an IBSS to join

[ 3504.968034] wlan0: Trigger new scan to find an IBSS to join

[ 3507.872033] wlan0: Trigger new scan to find an IBSS to join

[ 3510.668039] wlan0: Trigger new scan to find an IBSS to join

[ 3511.473337] wlan0: Creating new IBSS network, BSSID f2:96:e6:84:c6:2d

[ 3512.676031] wlan0: no IPv6 routers present

[ 3541.488046] wlan0: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)

[ 3572.312129] wlan0: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)

[ 3603.124035] wlan0: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)

[ 3603.969610] wlan0: Selected IBSS BSSID 8a:9f:71:7a:97:51 based on configured SSID

on the desktop and something similar on the laptop.

There weren't such messages before nfs installation, though I'm not sure that installation caused the problem. What does

Code:

wlan0: no IPv6 routers present

mean?

How do I connect? I don't use network managers, I connect manually, using the following procedure on the desktop and a similar one on the laptop:

Code:

sudo ifconfig wlan0 down

sudo iwconfig wlan0 mode ad-hoc

sudo iwconfig wlan0 channel 1

sudo iwconfig wlan0 key off

sudo ifconfig wlan0 up

sudo ifconfig wlan0 192.168.1.1

sudo iwconfig wlan0 essid '2111'