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Your description:

name    ip            ros_master_uri             ros_ip
-------------------------------------------------------------
master  192.168.1.99  http://localhost:11311     -
slave   192.168.1.12  http://192.168.1.99:11311  192.168.1.99

if I understand your setup correctly, you are running a roscore instance on the master machine, and need the slave machine to connect to that.

I don't really understand why "with internet" it works, but ROS_IP should be set to the ip address of the machine itself. It should not point to master in your case.

The use case for ROS_IP is one where you have no working DNS on your network, and it forces the middleware to use only addresses, not hostnames, when interacting with the rest of your graph. If "without internet" actually means "without a working DNS server", then setting ROS_IP correctly should allow your setup to work.

PS: be sure to not also have ROS_HOSTNAME set, as that will cause ROS_IP to be ignored. See Node Environment Variables - ROS_IP/ROS_HOSTNAME.

Your description:

name    ip            ros_master_uri             ros_ip
-------------------------------------------------------------
master  192.168.1.99  http://localhost:11311     -
slave   192.168.1.12  http://192.168.1.99:11311  192.168.1.99

if I understand your setup correctly, you are running a roscore instance on the master machine, and need the slave machine to connect to that.

I don't really understand why "with internet" it works, but ROS_IP should be set to the ip address of the machine itself. ("sets the declared network address of a ROS Node", see Node Environment Variables - ROS_IP/ROS_HOSTNAME). It should not point to master in your case.

The use case for ROS_IP is one where you have no working DNS on your network, and it forces the middleware to use only addresses, not hostnames, when interacting with the rest of your graph. If "without internet" actually means "without a working DNS server", then setting ROS_IP correctly should allow your setup to work.

PS: be sure to not also have ROS_HOSTNAME set, as that will cause ROS_IP to be ignored. See Node Environment Variables - ROS_IP/ROS_HOSTNAME.