If you use Debian, then it's quite easy if you can lend a screen and network for your RPi for just some minutes from a friend. If not, you could just test the commands for 'nmap' and 'ssh' from your Ubuntu host.
Just check that the package openssh-server are installed, and you are up and going. You do that from the command line with
aptitude install openssh-server. You could also check or rename the RPi when your are logged into the machine. You could also check that the package
avahi-daemon are installed, just try
aptitude install avahi-utils.
The avahi package/program will implement Apples protocoll mDNS/DNS-SD which will announce itself to other computers that uses that protocoll as a computer in the DNS domain
local. So if your machine is called
rpi-machine, try to connect to the machine with
You could check in the file
/etc/nsswitch.conf to see if you have this line there:
hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4
Both your Apple and Ubuntu machine should implement this. Your MS Windows 7 machine doesn't do that though. On the Ubuntu machine you could try this command:
You should then get all your machines and their services, like SSH and HTTP listed.
You could also try to install the package
nmap in your Ubuntu machine. Then can you check which net you are on with the command
ip route list to see which IP-net you are on. For example on my machine I could get something like this (this is from example.com, so don't use it):
126.96.36.199/24 dev eth0 proto kernel scope link src 188.8.131.52 metric 1
tells me that I am on net
184.108.40.206/24 and the router are
220.127.116.11. So if you run the command
nmap 18.104.22.168/24 will try to find all machines in your net and tell which ports are open. Look for port
22/tcp, as that are the ssh servers.