Cisco 1812 + HKBN 自動斷線

我用緊 hkbn100M 光纖上網, 但是連接 Cisco 1812 上網大概10-15 分鐘就會自動斷線而且無任何 log 和error message 出來

我試過用其他的isp 連到 router 並沒有發生斷線的情況 , 非常奇怪

Fiber connector -------> Cisco 1812 (FastEthernet1) --------->LAN

Router#sh run
Building configuration...

Current configuration : 3205 bytes
!
version 12.4
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime localtime
service timestamps log datetime localtime
service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
logging buffered 65565 debugging
!
no aaa new-model
!
resource policy
!
clock timezone GMT 8
!
!
ip cef
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.1.1
ip dhcp excluded-address 192.168.1.2
ip dhcp excluded-address 192.168.1.3
ip dhcp excluded-address 192.168.1.4
ip dhcp excluded-address 192.168.1.5
ip dhcp excluded-address 192.168.1.50
!
ip dhcp pool HomeDevice
network 192.168.1.0 255.255.255.0
dns-server 8.8.8.8 8.8.4.4
default-router 192.168.1.1
lease infinite
!
!
ip name-server 8.8.8.8
ip name-server 8.8.4.4
vpdn enable
!
vpdn-group 1
! Default PPTP VPDN group
accept-dialin
  protocol pptp
  virtual-template 1
!
!
!
!
username timtoa password 7 13524343535956737D77
!
!
!
!
!
!
interface FastEthernet0
ip address dhcp
shutdown
!
interface FastEthernet1
description HKBN
ip address dhcp
ip nat outside
ip virtual-reassembly
load-interval 30
duplex auto
speed auto
no cdp enable
!
interface BRI0
no ip address
encapsulation hdlc
shutdown
!
interface FastEthernet2
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet3
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet4
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet5
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet6
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet7
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet8
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet9
duplex full
speed 100
spanning-tree portfast
!
interface Virtual-Template1
ip unnumbered FastEthernet1
peer default ip address pool PPTP-Pool
no keepalive
ppp encrypt mppe 128
ppp authentication ms-chap ms-chap-v2
!
interface Vlan1
ip address 192.168.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly
!
ip local pool PPTP-Pool 192.168.1.200 192.168.1.210
!
!
ip http server
ip http authentication local
no ip http secure-server
ip nat inside source list 10 interface FastEthernet1 overload
ip nat inside source static tcp 192.168.1.4 3392 interface FastEthernet1 3392
ip nat inside source static tcp 192.168.1.3 3391 interface FastEthernet1 3391
ip nat inside source static tcp 192.168.1.2 3390 interface FastEthernet1 3390
ip nat inside source static tcp 192.168.1.50 443 interface FastEthernet1 443
ip nat inside source static tcp 192.168.1.50 902 interface FastEthernet1 902
ip nat inside source static tcp 192.168.1.50 903 interface FastEthernet1 903
!
access-list 10 permit 192.168.1.0 0.0.0.255
!
!
!
!
!
!
control-plane
!
!
line con 0
logging synchronous
login
line aux 0
line vty 0 4
login
!
ntp clock-period 17180152
ntp update-calendar
ntp server 194.177.210.54
!
webvpn context Default_context
ssl authenticate verify all
!
no inservice
!
end

Router#sh dhcp lease
Temp IP addr: 203.XX.217.28  for peer on Interface: FastEthernet1
Temp  sub net mask: 255.255.255.192
DHCP Lease server: 203.XX.96.154, state: 3 Bound
DHCP transaction id: 2478
Lease: 15203 secs,  Renewal: 7601 secs,  Rebind: 13302 secs
Temp default-gateway addr: 203.XX.217.1
Next timer fires after: 01:49:33
Retry count: 0 Client-ID: cisco-c47d.4fe5.2df3-Fa1
Client-ID hex dump: 636973636F2D633437642E346665352E
                     326466332D466131
Hostname: Router

Router#sh dhcp server
DHCP server: ANY (255.255.255.255)
Leases: 1
Offers: 1    Requests: 1    Acks : 1    Naks: 0
Declines: 0    Releases: 0    Query: 0    Bad: 0
DNS0: 203.185.0.37, DNS1:  203.185.0.36
Subnet: 255.255.255.192

Router#sh ip route
   203.XX.96.0/32 is subnetted, 1 subnets
S    203.XX.96.154 [254/0] via 203.XX.217.1, FastEthernet1
   203.XX.217.0/26 is subnetted, 1 subnets
C    203.XX.217.0 is directly connected, FastEthernet1
S* 0.0.0.0/0 [254/0] via 203.XX.217.1

Router#sh ip interface brief
Interface                IP-Address    OK? Method Status             Protocol
FastEthernet0             unassigned    YES NVRAM  administratively down down
FastEthernet1             203.XX.217.28 YES DHCP up                   up
BRI0                      unassigned    YES NVRAM  administratively down down
BRI0:1                   unassigned    YES unset  administratively down down
BRI0:2                   unassigned    YES unset  administratively down down
FastEthernet2             unassigned    YES unset  up                   down
FastEthernet3             unassigned    YES unset  up                   down
FastEthernet4             unassigned    YES unset  up                   down
FastEthernet5             unassigned    YES unset  up                   down
FastEthernet6             unassigned    YES unset  up                   down
FastEthernet7             unassigned    YES unset  up                   down
FastEthernet8             unassigned    YES unset  up                   down
FastEthernet9             unassigned    YES unset  up                   down
Vlan1                   192.168.1.1    YES NVRAM  up                   down
NVI0                      unassigned    NO  unset  up                   up
Virtual-Template1       203.XX.217.28 YES TFTP down                down
Virtual-Access1          unassigned    YES unset  down                down