Add mail sender configuration.

Originally-by: Estuardo Gorián <egorian@gmail.com>
Signed-off-by: Daniel Díaz <yosoy@danieldiaz.org>
Display current gateway on start up.

Originally-by: Estuardo Gorián <egorian@gmail.com>
Signed-off-by: Daniel Díaz <yosoy@danieldiaz.org>
Add checks for secondary link.

Originally-by: Estuardo Gorián <egorian@gmail.com>
Signed-off-by: Daniel Díaz <yosoy@danieldiaz.org>
Use configurable route command.

Can be set to use a remote host's route command.

Signed-off-by: Daniel Díaz <yosoy@danieldiaz.org>
Ping's latency is in seconds, not milliseconds.

Originally-by: Estuardo Gorián <egorian@gmail.com>
Signed-off-by: Daniel Díaz <yosoy@danieldiaz.org>
Honour QUIET for Syslog messages, introduce WARN level.

Signed-off-by: Daniel Díaz <yosoy@danieldiaz.org>
Warn and log on switching links.

Signed-off-by: Daniel Díaz <yosoy@danieldiaz.org>