數位天堂

請問這樣是被攻擊嗎？（如下方紀錄，僅列一小段，太長了）
一長串、不同時間、不同ip、不同port
看起來好像都沒有成功登入
該如何預防呢？
目前用 WL500GP + lly + E169u
放個一天就當掉了
重播也撥不上
reboot也沒有用
要斷電一陣子重開才有用
似乎是過熱的樣子....

Dec 11 14:50:13 dropbear[715]: Child connection from 222.221.2.210:12955
Dec 11 14:50:15 dropbear[715]: login attempt for nonexistent user from 222.221.2.210:12955
Dec 11 14:50:15 dropbear[715]: exit before auth: Disconnect received
Dec 11 14:50:16 dropbear[716]: Child connection from 222.221.2.210:13916
Dec 11 14:50:17 dropbear[716]: login attempt for nonexistent user from 222.221.2.210:13916
Dec 11 14:50:18 dropbear[716]: exit before auth: Disconnect received
Dec 11 14:50:18 dropbear[717]: Child connection from 222.221.2.210:13725
Dec 11 14:50:20 dropbear[717]: bad password attempt for 'admin' from 222.221.2.210:13725
Dec 11 14:50:20 dropbear[717]: exit before auth (user 'admin', 1 fails): Disconnect received
Dec 11 14:50:21 dropbear[718]: Child connection from 222.221.2.210:12633
Dec 11 14:50:22 dropbear[718]: bad password attempt for 'admin' from 222.221.2.210:12633
Dec 11 14:50:23 dropbear[718]: exit before auth (user 'admin', 1 fails): Disconnect received
Dec 11 14:50:23 dropbear[719]: Child connection from 222.221.2.210:12513
Dec 11 14:50:25 dropbear[719]: login attempt for nonexistent user from 222.221.2.210:12513
Dec 11 14:50:26 dropbear[719]: exit before auth: Disconnect received
Dec 11 14:50:26 dropbear[720]: Child connection from 222.221.2.210:15016
Dec 11 14:50:28 dropbear[720]: login attempt for nonexistent user from 222.221.2.210:15016
Dec 11 14:50:29 dropbear[720]: exit before auth: Disconnect received
Dec 11 14:50:29 dropbear[721]: Child connection from 222.221.2.210:15495
Dec 11 14:50:31 dropbear[721]: login attempt for nonexistent user from 222.221.2.210:15495
Dec 11 14:50:31 dropbear[721]: exit before auth: Disconnect received
Dec 11 14:50:31 dropbear[722]: Child connection from 222.221.2.210:13245
Dec 11 14:50:33 dropbear[722]: login attempt for nonexistent user from 222.221.2.210:13245
Dec 11 14:50:34 dropbear[722]: exit before auth: Disconnect received
Dec 11 14:50:34 dropbear[723]: Child connection from 222.221.2.210:13381
Dec 11 14:50:36 dropbear[723]: login attempt for nonexistent user from 222.221.2.210:13381
Dec 11 14:50:37 dropbear[723]: exit before auth: Disconnect received
Dec 11 14:50:37 dropbear[724]: Child connection from 222.221.2.210:17390
Dec 11 14:50:42 dropbear[724]: login attempt for nonexistent user from 222.221.2.210:17390
Dec 11 14:50:43 dropbear[724]: exit before auth: Disconnect received
Dec 11 14:50:43 dropbear[725]: Child connection from 222.221.2.210:18074
Dec 11 14:50:45 dropbear[725]: login attempt for nonexistent user from 222.221.2.210:18074