路由显示的日志，同一台交换机连出来的十台电脑有一半掉网了

问题描述：

路由的系统日志：
[Fri Aug 10 20:28:56 2007]:[DHCPD] received DISCOVER
[Fri Aug 10 20:28:56 2007]:[DHCPD] mac has been exist!
[Fri Aug 10 20:28:57 2007]:[DHCPD] sending OFFER of 192.168.1.10
[Fri Aug 10 20:28:57 2007]:[DHCPD] broadcasting packet to client
[Fri Aug 10 20:28:58 2007]:[DHCPD] received REQUEST
[Fri Aug 10 20:28:58 2007]:[DHCPD] Not my server ID
[Fri Aug 10 20:29:01 2007]:[HTTP] login (192.168.1.8)
[Fri Aug 10 20:29:15 2007]:[HTTP] logout (192.168.1.8)
[Fri Aug 10 20:29:18 2007]:[DHCPD] received DISCOVER
[Fri Aug 10 20:29:18 2007]:[DHCPD] mac has been exist!
[Fri Aug 10 20:29:19 2007]:[DHCPD] sending OFFER of 192.168.1.3
[Fri Aug 10 20:29:19 2007]:[DHCPD] unicasting packet to client ciaddr
[Fri Aug 10 20:29:48 2007]:[FW] **Port Scan Detected** 59.35.243.164 -> 59.35.109.138
[Fri Aug 10 20:29:48 2007]:[FW] **Port Scan Detected** 59.35.243.164 -> 59.35.109.138
[Fri Aug 10 20:29:48 2007]:[FW] **Port Scan Detected** 59.35.243.164 -> 59.35.109.138
[Fri Aug 10 20:29:48 2007]:[FW] **Port Scan Detected** 59.35.243.164 -> 59.35.109.138
[Fri Aug 10 20:31:36 2007]:[FW] **Port Scan Detected** 218.16.187.162 -> 59.35.109.138
[Fri Aug 10 20:31:36 2007]:[FW] **Port Scan Detected** 218.16.187.162 -> 59.35.109.138
116.17.56.82 -> 59.35.109.138
[Fri Aug 10 20:40:38 2007]:[FW] **Port Scan Detected** 116.17.56.82 -> 59.35.109.138
[Fri Aug 10 20:43:07 2007]:[FW] **Port Scan Detected** 61.143.80.244 -> 59.35.109.138
[Fri Aug 10 20:48:19 2007]:[DHCPD] received DISCOVER
[Fri Aug 10 20:48:19 2007]:[DHCPD] mac has been exist!

我是借了朋友4万元做小型网吧的，但最近总是出现问题，要么就中了AUTO病毒，要么就交换机接出来的十台电脑中会出现几台掉网的问题，一次是这几台，一次是其他几台。是否中了ARP病毒？ 但不知如何查证是否中了ARP这种病毒。或者是其他原因，请各位大哥大姐指点一下，我真的很迷惘，感觉很疲惫。我的网吧是请人做的无盘系统，服务器和十台分机都没有装防火墙和杀毒软件的！请大家帮我这个忙，在此衷心祝福助人的朋友们！

问题解答：

路由显示的日志，同一台交换机连出来的十台电脑有一半掉网了这个旅游问答期待您的解答，请登录账号或关注微信公众号回答这个问题。