[cisco-nas] ping fails over dialer interface

[Dinesh Bhonsle]

Hi,

I have cisco850 - pppoe client,  i am unable to ping to the default gw on
the bras.
pc-----cisco850(CPE)-------netgearSwitch(pvid 4001)------BRAS

cisco-850  gets a  ip address from BRAS  as 172.16.1.3.  multibind interface
at BRAS is 172.16.1.254.
so when i try to ping 172.16.1.254 from cisco, encapsulation fails, may be
arp res

cpe1#sh run
Building configuration...

Current configuration : 1540 bytes
!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname cpe1
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$pb71$nc1Bi.IaAJLdMPXtXeggO0
enable password test123
!
no aaa new-model
!
resource policy
!
ip subnet-zero
no ip routing
no ip dhcp use vrf connected
!
ip dhcp pool myownpool
   import all
   network 192.168.100.0 255.255.255.0
   dns-server 68.2.16.25
   lease 7
!
!
no ip cef
vpdn enable
!
!
!
!
!
!
!
!
!
interface FastEthernet0
!
interface FastEthernet1
 shutdown
!
interface FastEthernet2
 shutdown
!
interface FastEthernet3
 shutdown
!
interface FastEthernet4
 description "UPLINK connected to BRAS"
 no ip address
 ip virtual-reassembly
 no ip route-cache
 duplex auto
 speed auto
 pppoe enable group global
 pppoe-client dial-pool-number 1
!
interface Vlan1
 description "dhcp interface for home-users"
 ip address 192.168.100.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
 no ip route-cache
!
interface Dialer0
 ip address negotiated
 ip mtu 1492
 ip nat outside
 ip virtual-reassembly
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 ppp chap hostname team at teambackbone
 ppp chap password 0 team
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
!
no ip http server
no ip http secure-server
ip nat inside source list 1 interface Dialer0 overload
!
dialer-list 1 protocol ip permit
!
control-plane
!
!
line con 0
 no modem enable
line aux 0
line vty 0 4
 password test
 login
!
scheduler max-task-time 5000
end


cpe1#ping 172.16.1.254

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.254, timeout is 2 seconds:

*Mar  1 06:55:26.082: IP: tableid=0, s=172.16.1.4 (local),
d=172.16.1.254(Dialer0), routed via RIB
*Mar  1 06:55:26.082: IP: s=172.16.1.4 (local), d=172.16.1.254 (Dialer0),
len 100, sending
03C2C9D0:                   45000064 004E0000          E..d.N..
03C2C9E0: FF016028 AC100104 AC1001FE 080031FD  ..`(,...,..~..1}
03C2C9F0: 00130000 00000000 015E4ADC ABCDABCD  .........^J\+M+M
03C2CA00: ABCDABCD ABCDABCD ABCDABCD ABCDABCD  +M+M+M+M+M+M+M+M
03C2CA10: ABCDABCD ABCDABCD ABCDABCD ABCDABCD  +M+M+M+M+M+M+M+M
03C2CA20: ABCDABCD ABCDABCD ABCDABCD ABCDABCD  +M+M+M+M+M+M+M+M


  1 06:55:26.082: IP: s=172.16.1.4 (local), d=172.16.1.254 (Dialer0), len
100, sending
03C2C9D0:                   45000064 004E0000          E..d.N..
03C2C9E0: FF016028 AC100104 AC1001FE 080031FD  ..`(,...,..~..1}
03C2C9F0: 00130000 00000000 015E4ADC ABCDABCD  .........^J\+M+M
03C2CA00: ABCDABCD ABCDABCD ABCDABCD ABCDABCD  +M+M+M+M+M+M+M+M
03C2CA10: ABCDABCD ABCDABCD ABCDABCD ABCDABCD  +M+M+M+M+M+M+M+M
03C2CA20: ABCDABCD ABCDABCD ABCDABCD ABCDABCD  +M+M+M+M+M+M+M+M
03C2CA30: ABCDABCD ABCDABCD ABCDABCD           +M+M+M+M+M+M
*Mar  1 06:55:26.086: IP ARP: creating incomplete entry for IP address:
172.16.1.254 interface Vlan1
*Mar  1 06:55:26.086: IP ARP: sent req src 192.168.100.1 0018.1849.c9ee,
                 dst 172.16.1.254 0000.0000.0000 Vlan1
*Mar  1 06:55:26.086: IP ARP: sent req src 172.16.1.4 0018.1849.c9ee,
                 dst 172.16.1.254 0000.0000.0000 Dialer0
*Mar  1 06:55:27.086: IP ARP: sent req src 192.168.100.1 0018.1849.c9ee,
                 dst 172.16.1.254 0000.0000.0000 Vlan1
*Mar  1 06:55:27.086: IP ARP: sent req src 172.16.1.4 0018.1849.c9ee,
                 dst 172.16.1.254 0000.0000.0000 Dialer0.
*Mar  1 06:55:28.086: IP ARP: sent req src 192.168.100.1 0018.1849.c9ee,
                 dst 172.16.1.254 0000.0000.0000 Vlan1
*Mar  1 06:55:28.086: IP ARP: sent req src 172.16.1.4 0018.1849.c9ee,
                 dst 172.16.1.254 0000.0000.0000 Dialer0
*Mar  1 06:55:29.086: IP ARP: sent req src 192.168.100.1 0018.1849.c9ee,
                 dst 172.16.1.254 0000.0000.0000 Vlan1
*Mar  1 06:55:29.086: IP ARP: sent req src 172.16.1.4 0018.1849.c9ee,
                 dst 172.16.1.254 0000.0000.0000 Dialer0
*Mar  1 06:55:29.086: IP: s=172.16.1.4 (local), d=172.16.1.254 (Dialer0),
len 100, encapsulation failed
03C2C9D0:                   45000064 004E0000          E..d.N..
03C2C9E0: FF016028 AC100104 AC1001FE 080031FD  ..`(,...,..~..1}
03C2C9F0: 00130000 00000000 015E4ADC ABCDABCD  .........^J\+M+M
03C2CA00: ABCDABCD ABCDABCD ABCDABCD ABCDABCD  +M+M+M+M+M+M+M+M
03C2CA10: ABCDABCD ABCDABCD ABCDABCD ABCDABCD  +M+M+M+M+M+M+M+M
03C2CA20: ABCDABCD ABCDABCD ABCDABCD ABCDABCD  +M+M+M+M+M+M+M+M
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