우분투 transmission-daemon 에서 UDP Failed to set receive buffer: requested 4194304, got 327680 에러 해결법

오드로이드에다가 transmission을 설치 했는데 htop에서 보면 /usr/bin/transmission-daemon -f –log-error 항목이 계속 나오길래 transmission-daemon 상태를 보니

linsoo@odroid:~$ sudo service transmission-daemon status
● transmission-daemon.service - Transmission BitTorrent Daemon
   Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2018-09-25 21:02:13 KST; 16min ago
  Process: 19563 ExecStop=/bin/kill -s STOP $MAINPID (code=exited, status=0/SUCCESS)
 Main PID: 19636 (transmission-da)
   Status: "Idle."
   CGroup: /system.slice/transmission-daemon.service
           └─19636 /usr/bin/transmission-daemon -f --log-error

Sep 25 21:02:13 odroid systemd[1]: Starting Transmission BitTorrent Daemon...
Sep 25 21:02:13 odroid systemd[1]: Started Transmission BitTorrent Daemon.
Sep 25 21:02:14 odroid transmission-daemon[19636]: [2018-09-25 21:02:14.948] UDP Failed to set receive buffer: requested 4194304, got 327680 (tr-udp.c:84)
Sep 25 21:02:14 odroid transmission-daemon[19636]: [2018-09-25 21:02:14.949] UDP Failed to set send buffer: requested 1048576, got 327680 (tr-udp.c:95)

이렇게 에러가 있음.
UDP용 버퍼 설정했는데 제대로 할당이 안된다는 에러.

/etc/sysctl.conf 파일을 열어서 맨아래에

net.core.rmem_max = 4194304
net.core.wmem_max = 1048576

이렇게 추가해주고 재부팅하면 해결됨.