[cisco-nas] ping fails over dialer interface

Shain Singh shain.singh at aapt.com.au
Thu Sep 25 22:01:06 EDT 2008


Hi Dinesh,

Have a look through your NAT translations.

Depending on what you're trying to achieve the "ip nat outside"  
should be on FastEthernet4 possibly.

Have a read of this to see if if your setup is similar.

http://www.cisco.com/en/US/docs/routers/access/800/850/software/ 
configuration/guide/pppoenat.html#wp1235296


--

Shaineel Singh
IP/MPLS Engineering
AAPT Pty Ltd

phone: +613 8308 3567
email: shain.singh at aapt.com.au



On 26/09/2008, at 10:18 AM, Dinesh Bhonsle wrote:

> 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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