The network manager should not control the interfaces managed by the universal node:
interfaces provided at the bootstrapping through the config file
interfaces created dynamically and attached to the VNFs
As described here, to specify that the network manager must not control a specific interface, on Ubuntu (it's fine, since we explicitly say that the UN must be installed on Ubuntu) it is necessary to edit the file /etc/NetworkManager/NetworkManager.conf as follows:
where xx:xx:xx:xx:xx:xx is the mac address of the interface you want to ignore.
Then, each time the UN creates an interface, it has to retrieve the MAC address (e.g., through ifconfig) and edit the file above.
Note that it is not necessary to restart the network manager when the file is edited.
This avoids that the nasty network manager keeps control of an interface when is created, it assigns it an IP address which (very likely in a live demo) will conflict with some other addresses we already configured on the box, with the consequence of messing up the entire routing and bringing the live demo to fail.
The network manager should not control the interfaces managed by the universal node:
As described here, to specify that the network manager must not control a specific interface, on Ubuntu (it's fine, since we explicitly say that the UN must be installed on Ubuntu) it is necessary to edit the file
/etc/NetworkManager/NetworkManager.confas follows:where
xx:xx:xx:xx:xx:xxis the mac address of the interface you want to ignore.Then, each time the UN creates an interface, it has to retrieve the MAC address (e.g., through
ifconfig) and edit the file above. Note that it is not necessary to restart the network manager when the file is edited.This avoids that the nasty network manager keeps control of an interface when is created, it assigns it an IP address which (very likely in a live demo) will conflict with some other addresses we already configured on the box, with the consequence of messing up the entire routing and bringing the live demo to fail.