[cisco-nas] ping fails over dialer interface
Dinesh Bhonsle
dineshbs123 at gmail.com
Fri Sep 26 16:02:03 EDT 2008
Hi,
thanks for the help, enabling iprouting fixed the ping issue.
But have doubt on nat config.
on cisco850, i want to translate ip addresses on my internal lan to a global
ip-address got via pppoe dialer0 .
interface FastEthernet0 --> connects to lan were linux box are dhcp client
interface FastEthernet4-> is uplink
so i tried this nat config which does not work.
ip nat pool letmeout 172.16.1.1 172.16.1.254 netmask 255.255.255.0
ip nat inside source list 1 pool letmeout
!
access-list 1 permit 192.168.1.0 0.0.0.255
dialer-list 1 protocol ip permit
interface FastEthernet0
!
!
interface FastEthernet4
description "UPLINK connected to BRAS"
no ip address
ip nat outside
no ip virtual-reassembly
duplex auto
speed auto
pppoe enable group global
pppoe-client dial-pool-number 1
!
interface FastEthernet4.4001
ip virtual-reassembly
pppoe enable
!
interface Vlan1
description "dhcp interface for home-users"
ip address 192.168.100.1 255.255.255.0
ip nat inside
no ip virtual-reassembly
!
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
!
On Thu, Sep 25, 2008 at 5:18 PM, Dinesh Bhonsle <dineshbs123 at gmail.com>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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