Now we need to start a UML session and connect it to our tap device. The following line is merely an example and will most likely not work "out of the box". The important thing to notice is that "eth0" is connected to a tuntap device. Anything after the first comma is considered extra parameters, for tuntap we need only specify the name of the tun device on the host we wish to connect to.
./linux ubd0=./root_fs mem=64M con=null con0=fd:0,fd:1 \ devfs=nomount eth0=tuntap,uml-conn0
Presuming we've now managed to get into the UML session the
next step is to login as the superuser and configure the
devices. For the network in our example we want to configure
our UML with an IP of
192.168.0.X and a subnet mask of
ifconfig eth0 192.168.0.201 netmask 255.255.255.0 up
We should now be able to communicate with other machines on
the local network! Test this by pinging other hosts on the
network, connecting to services etc. On the network in the
example our gateway to networks other than our own (the
Internet, for example) is
192.168.0.100, which can be set as
route add default gw 192.168.0.100
We do not need to set the gateway in order for our UML to communicate with other machines on the network. It just happens that in this example our gateway to the internet is the same host that is running the UML session.
Don't forget to create
We should now have a host with a bridge running on it that sends traffic around to our UML sessions. If there is a gateway and it is set inside the UML session we should also be able to access the internet.