Hi All,
There was a strange case rised on my customer environment. On my customer's Cisco 2811 w/ 12.4(10) or 2611XM w/ 12.3(10c), there are two dynamic ADSL line connecting to the WIC1ADSL card which are used with PPPoE settings(Dialer interface) to get internet connectivities. After these 2 lines or one of them dialed up to ISP, they get 2 public IP addresses on dialer interfaces, but I find that there is a connected route added to the routing table, I suspect that the host in the route entry is a host inside the ISP. This route entry is not in existance when the ATM interface goes down. And this case never happened on my other customer. So I would like to ask anyone who knows why a CONNECTED route entry automatically added to the routing table of the router? This case still happens even I reset the router to dummy setting which only serves the PPPoE.
The routing table is like the following:
Gateway of last resort is 0.0.0.0 to network 0.0.0.0
100.x.100.0/32 is subnetted, 1 subnets
C 100.x.100.29 is directly connected, Dialer1
99.0.0.0/32 is subnetted, 1 subnets
C 99.31.47.18 is directly connected, Dialer1
C 192.168.1.0/24 is directly connected, Loopback0
S* 0.0.0.0/0 is directly connected, Dialer1
Note: 100.100.100.29 is the suspected entry. This IP and route entry is constant after both or one of the 2 broadbands dialed up to ISP. 99.x.x.18 is the IP of dialer1 interface.
The following is the dummy settings on 2611XM:
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname 2611
!
boot-start-marker
boot-end-marker
!
!
no network-clock-participate slot 1
no network-clock-participate wic 0
no aaa new-model
ip subnet-zero
ip cef
!
!
!
ip audit po max-events 100
vpdn enable
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback0
ip address 192.168.1.1 255.255.255.0
ip nat inside
!
interface ATM0/0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
pvc 1/33
encapsulation aal5snap
pppoe-client dial-pool-number 1
!
!
interface FastEthernet0/0
ip address 192.168.0.1 255.255.255.0
ip nat inside
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Dialer1
ip address negotiated
ip mtu 1492
ip nat outside
encapsulation ppp
ip tcp adjust-mss 1452
dialer pool 1
dialer-group 1
ppp authentication pap callin
ppp pap sent-username test password test
!
ip nat inside source list 100 interface Dialer1 overload
ip http server
no ip http secure-server
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer1
!
!
access-list 100 permit ip 192.168.1.0 0.0.0.255 any
access-list 100 permit ip 192.168.0.0 0.0.0.255 any
dialer-list 1 protocol ip permit
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
!
!
end
Thanks!
Jason
