int echo_timeout; // Time between last packet sent and LCP ECHO generation
int idle_echo_timeout; // Time between last packet seen and
// Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
int echo_timeout; // Time between last packet sent and LCP ECHO generation
int idle_echo_timeout; // Time between last packet seen and
// Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds