WLAN loss has nothing with DNS. You hit something else. What do you mean "loss" - your N900 disconnected WLAN? Or you just can't ping host.wlan.yourdomain because it host.wlan.youdomain is unknown? EDIT: Try connect VLAN again and disconnect (no modifications of any resolve.conf), it looks like it helps. Sorry, I can't setup vpnc connection now and test. EDIT2: After second look I think it has sense to you stop debugging vpnc-script and return it to usual one or just reinstall vpnc. Sorry, but it is difficult to debug via conference thread. I had no time to do it (I use Cisco VPN from time to time, on business trip), so - please stop debugging it.