Network is down

Cause
A transport connection failed because it encountered a dead network.
Action
Report this error to the system administrator for the network. If you are the person
responsible for this network, check why the network is dead and what repairs are
necessary.
Technical Notes
This error results from status information delivered by the underlying
communication interface.
The symbolic name for this error is ENETDOWN, errno=127.

Network is unreachable

Cause
An operational error occurred either because there was no route to the network or
because negative status information was returned by intermediate gateways or
switching nodes.

The returned status is not always sufficient to distinguish between a network that is
down and a host that is down. See the No route to host message.
Action
Check the network routers and switches to see if they are disallowing these packet
transfers. If they are allowing all packet transfers, check network cabling and
connections.
Technical Notes
The symbolic name for this error is ENETUNREACH, errno=128.