아파치 로그에 이상한게 계속 찍히는데 이게 뭘까요?

127.0.0.1 - - [07/Jan/2018:01:52:19 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:52:20 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:52:21 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:52:22 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:52:23 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:52:24 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:52:25 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:53:13 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:53:46 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:53:47 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:53:48 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:53:49 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:53:50 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:53:51 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:53:53 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:54:21 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:54:22 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:54:23 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:54:24 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:54:25 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:54:26 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:54:27 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:44 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:45 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:46 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:47 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:48 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:49 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:50 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:51 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:52 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:53 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:54 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:55 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:56 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:57 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:58 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:55:59 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:56:00 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:56:01 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:56:02 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
127.0.0.1 - - [07/Jan/2018:01:56:03 +0900] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.18 (Ubuntu) (internal dummy connection)"
 

이런게 계속해서 찍히는데 대체 뭘까요?

127.0.0.1로 찍히는거 봐선 내부에서 동작하는건가본데.. 이해가 안갑니다.

저는 그누보드를 쓰고 있습니다.