I've installed isc-dhcp-server and followed all the instructions for setting up an encrypted ad-hoc network as per http://lcdev.dk/2012/11/18/raspberry-pi-tutorial-connect-to-wifi-or-create-an-encrypted-dhcp-enabled-ad-hoc-network-as-fallback/. I seem to be able to connect to the wifi network after being prompted for the WEP key, although the wifi icon on the idevice does not appear, and I seem to have an ip address of 169.254.112.187 (169.254.x.x IP address ranges seem to indicate issues?) on the idevice, and whatever I try to access over iSSH from the idevice I never seem to get a working connection (I've tried to connect to 10.0.0.200 from the idevice). I've even tried setting up static ip of 10.0.0.x and a subnet mask of 255.255.255.0 on the idevice - no luck.
Am I missing something obvious, am I expecting to be able to SSH from the idevice to the RPI over an ad-hoc network when you simply cannot?