频繁掉线，路由器日志内详，求分析
ADSL 路由器共享上网，总是断网，一般重启猫后恢复正常，有时候重启猫也不行
// 断网的时候，路由器的日志
[Tue Jun 14 18:57:25 2011]:[PPP] ipcp down
[Tue Jun 14 18:57:30 2011]:[POE] send PADT(10588)
[Tue Jun 14 18:57:32 2011]:[POE] ppp0 do connect
[Tue Jun 14 18:57:32 2011]:[POE] ppp0 connect mode=0
[Tue Jun 14 18:57:32 2011]:[POE] ppp0 start...
[Tue Jun 14 18:57:32 2011]:[POE] ppp0 send PADI
// 断网后，又自动重新连接
[Tue Jun 14 19:08:16 2011]:[POE] ppp0 rcv PADO
[Tue Jun 14 19:08:16 2011]:[POE] Send PADR, Enter PPPOE_SREQ
[Tue Jun 14 19:08:16 2011]:[POE] ppp0 rcv PADS
[Tue Jun 14 19:08:16 2011]:[POE] Enter PPPOE_CONNECTED, Session_ID=11430
[Tue Jun 14 19:08:16 2011]:[PPP] start lcp stage
[Tue Jun 14 19:08:16 2011]:[PPP] ipcp up
[Tue Jun 14 19:08:16 2011]:[PPP] Got gateway IP 172.16.10.21
[Tue Jun 14 19:08:16 2011]:[PPP] Got local IP 222.181.113.236
[Tue Jun 14 19:08:16 2011]:[PPP] Got Primary DNS address 61.128.128.68
[Tue Jun 14 19:08:16 2011]:[PPP] Got Secondary DNS address 61.128.192.68
// 又断网
[Tue Jun 14 19:21:29 2011]:[POE] Shut down
[Tue Jun 14 19:21:30 2011]:[POE] ppp0 do connect
[Tue Jun 14 19:21:30 2011]:[POE] ppp0 connect mode=0
[Tue Jun 14 19:21:30 2011]:[POE] ppp0 start...
[Tue Jun 14 19:21:30 2011]:[POE] ppp0 send PADI
// 重启一下猫
[Tue Jun 14 13:14:32 2011]:[SYS] System start
[Tue Jun 14 13:14:32 2011]:[SYS] Ver 2.1.2.114 build:2 @ Wed Jul 11 12:41:44 2007
[Tue Jun 14 13:14:33 2011]:[DHCPD] received REQUEST
[Tue Jun 14 13:14:33 2011]:[DHCPD] no leases, packet->ciaddr:c0a81209
[Tue Jun 14 13:14:34 2011]:[DHCPD] sending ACK to 192.168.18.9
[Tue Jun 14 13:14:34 2011]:[DHCPD] unicasting packet to client ciaddr
[Tue Jun 14 13:14:34 2011]:[DHCPD] received REQUEST
[Tue Jun 14 13:14:34 2011]:[DHCPD] no leases, packet->ciaddr:c0a81203
[Tue Jun 14 13:14:34 2011]:[DHCPD] sending ACK to 192.168.18.3
[Tue Jun 14 13:14:34 2011]:[DHCPD] unicasting packet to client ciaddr
[Tue Jun 14 13:14:34 2011]:[DHCPD] received REQUEST
[Tue Jun 14 13:14:34 2011]:[DHCPD] no leases, requested_align:c0a81205
[Tue Jun 14 13:14:35 2011]:[POE] ppp0 start...
[Tue Jun 14 13:14:35 2011]:[POE] ppp0 send PADI
[Tue Jun 14 13:14:35 2011]:[DHCPD] sending ACK to 192.168.18.5
[Tue Jun 14 13:14:35 2011]:[DHCPD] broadcasting packet to client
[Tue Jun 14 13:14:36 2011]:[DHCPD] received REQUEST
[Tue Jun 14 13:14:36 2011]:[DHCPD] no leases, packet->ciaddr:c0a81204
[Tue Jun 14 13:14:36 2011]:[DHCPD] sending ACK to 192.168.18.4
[Tue Jun 14 13:14:36 2011]:[DHCPD] unicasting packet to client ciaddr
[Tue Jun 14 13:14:37 2011]:[DHCPD] received REQUEST
[Tue Jun 14 13:14:37 2011]:[DHCPD] no leases, requested_align:c0a81208
[Tue Jun 14 13:14:38 2011]:[DHCPD] sending ACK to 192.168.18.8
[Tue Jun 14 13:14:38 2011]:[DHCPD] broadcasting packet to client
[Tue Jun 14 13:14:44 2011]:[POE] ppp0 do connect
[Tue Jun 14 13:14:44 2011]:[POE] ppp0 connect mode=0
[Tue Jun 14 13:14:44 2011]:[POE] ppp0 start...
[Tue Jun 14 13:14:44 2011]:[POE] ppp0 send PADI
[Tue Jun 14 13:31:34 2011]:[HTTP] login (192.168.18.5)
