ECHO_REQ         1521 net/if_spppsubr.c 	case ECHO_REQ:
ECHO_REQ         3943 net/if_spppsubr.c 			sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
ECHO_REQ         4249 net/if_spppsubr.c 	case ECHO_REQ:   return "echo-req";