add instruction to how to make vms correctly connected with vm-start

README.md

@@ -24,7 +24,7 @@ script which permit to launch easily some virtual machines via qemu
 - can support launching vm in uefi mode [ok] (doesn't fully support the UEFI in conf mode, preffer use the option uefi while launching vm.)
 - can add customs options to a vm [ok]
 - take option create_disk to know what disk to use when creating a vm. [ok]
-- compatible to an extensive network configuration [NO] (actually only support nat with ssh forward on localhost:10022)
+- compatible to an extensive network configuration [~ok] (can work either with nat or bridge of even without any network. By default it is one interface by nat, and don't work whith the config file yet.)
 
 
 
@@ -46,4 +46,29 @@ you can of course add options like uefi to tun in uefi mode, or nproc=<nb_proc>
 
 If you go to the conf folder created the first time you launch the script, you will find all configured variables for each of your vm.
 
+### to connect two vm on different networks at a gateway nat.
+
+first, run the script set-tap.sh to create two bridges.
+```
+set-tap.sh --add-br-id=br0
+set-tap.sh --add-br-id=br1
+```
+
+after that change the mac address of all vm in conf folder.
+
+```
+vm-1 from 00:00:00:00:00:00 to 00:00:00:00:00:01
+vm-2 from 00:00:00:00:00:00 to 00:00:00:00:00:02
+```
+and start the gateway and the vms after.
+
+```
+vm-start.sh gateway start net=br:br0 net=br:br1 net=nat:id01
+vm-start.sh vm-1 start net=br:br0
+vm-start.sh vm-2 start net=br:br1
+```
+
+And that's it, your three vm are now connected. You just have now to do some configurations on thoses vms.
+
+