問如何知道基地台有被外者使用??

請問如何看出有被使用呢??
[2000-01-01 00:00:13]: start PPPoE daemon
[2000-01-01 00:00:15]: [DNS]: dns restart ...
[2000-01-01 00:00:17]: [DNS]: dns restart ...
[2000-01-01 00:01:00]: [DNS]: dns restart ...
[2000-01-01 00:01:04]: [SNTP]: connect to TimeServer 192.43.244.18 ...
[2012-03-27 14:21:48]: [SNTP]: connect success!
[2012-03-27 14:21:48]: [SNTP]: set time to 2012-03-27 14:21:48
[2012-03-27 14:21:48]: [FIREWALL]: WAN IP is 218.172.126.144 setting firewall...
[2012-03-27 14:21:48]: [FIREWALL]: WAN2 IP is setting firewall...
[2012-03-28 04:44:22]: [DNS]: dns restart ...
[2012-03-28 04:44:24]: [DNS]: dns restart ...
[2012-03-28 04:44:30]: [DNS]: dns restart ...
[2012-03-28 04:45:12]: [DNS]: dns restart ...
[2012-03-28 04:45:17]: [SNTP]: connect to TimeServer 192.43.244.18 ...
[2012-03-28 04:45:17]: [FIREWALL]: WAN IP is 218.172.127.114 setting firewall...
[2012-03-28 04:45:17]: [FIREWALL]: WAN2 IP is setting firewall...
[2012-03-28 04:45:22]: [SNTP]: connect success!
[2012-03-28 04:45:22]: [SNTP]: set time to 2012-03-28 04:45:22
[2012-03-28 09:26:27]: [DNS]: dns restart ...
[2012-03-28 09:26:29]: [DNS]: dns restart ...
[2012-03-28 09:26:35]: [DNS]: dns restart ...
[2012-03-28 09:27:16]: [DNS]: dns restart ...
[2012-03-28 09:27:21]: [SNTP]: connect to TimeServer 192.43.244.18 ...
[2012-03-28 09:27:23]: [SNTP]: connect success!
[2012-03-28 09:27:23]: [SNTP]: set time to 2012-03-28 09:27:23
[2012-03-28 09:27:23]: [FIREWALL]: WAN IP is 218.172.203.166 setting firewall...
[2012-03-28 09:27:23]: [FIREWALL]: WAN2 IP is setting firewall...