07-27-2011 08:04 AM - edited 03-04-2019 01:06 PM
Hello,
I have an old modem Cisco 1700 with ADSL as backup connection.
I have configured PPPoA, the sync is OK and connection is UP.
I get Wan IP et Gateway, (routes automatically added).
I have added NAT and routes but impossible to go out.
I try to ping an external IP but no response.
Can someone check my configuration ? Something wrong with NAT or routing ?
Thanks for you help...
FV
Building configuration...
!
version 12.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname cisco-modem
!
logging queue-limit 100
!
ip subnet-zero
!
ip dhcp excluded-address 10.10.110.1
!
ip audit notify log
ip audit po max-events 100
!
interface ATM0/0
no ip address
load-interval 30
no atm ilmi-keepalive
pvc 8/35
encapsulation aal5mux ppp dialer
pppoe-client dial-pool-number 1
!
dsl operating-mode auto
!
interface FastEthernet0/0
ip address 10.10.110.1 255.255.255.0
no ip proxy-arp
ip nat inside
speed auto
half-duplex
!
interface Dialer0
mtu 1492
ip address negotiated
ip nat outside
encapsulation ppp
ip route-cache flow
dialer pool 1
dialer-group 1
ppp authentication chap callin
ppp chap hostname ******
ppp chap password 0 ****
!
ip nat inside source list 1 interface Dialer0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
ip route 192.168.110.0 255.255.255.0 10.10.110.254
ip http server
no ip http secure-server
!
access-list 1 permit 10.10.110.0 0.0.0.255
dialer-list 1 protocol ip permit
!
!
line con 0
logging synchronous
line aux 0
line vty 0 4
logging synchronous
login
!
no scheduler allocate
end
07-27-2011 08:10 AM
Nothing obviously wrong. Can you answer the following questions -
1) what IP address are you pinging from ie. a PC or laptop IP
2) from the device you are pinging from ca you ping the inside interface of the router ?
3) from the router can you ping something on the internet
Jon
07-27-2011 09:17 AM
Thanks for your reply.
I try to ping 8.8.8.8 (Dns google) or Wan IP address or the Gateway from the cisco.
No response from it.
FV
07-27-2011 09:25 AM
Francois
Just to clarify. So you are pinging from the router itself ? If so NAT is irrelevant, it sounds like there is an issue with your connectivity to your ISP.
Jon
07-27-2011 09:27 AM
Yes I am pinging from the modem Cisco I try to configure.
Do you know commands I can use to check the connectivity ?
Thanks
FV
07-28-2011 12:16 AM
I don't understand. The config sems to be correct.
I have configured the ADSL connection on a basic linksys modem with the same configuration and it works perfectly on it... (I can ping the WAN IP, the Gateway, 8.8.8.8,...)
I have no idea what's wrong with the configuration of the cisco
Problem with routing ? NAT ?
Thank you
FV
07-28-2011 04:17 AM
if you cant ping the ip address of the dial0 interface that is really strange.
Does it get an internet address with the command
show ip int brief
07-28-2011 04:34 AM
Yes I get my Wan IP but unable to ping... (see result below)
But I often get this message :
*Apr 27 20:34:41.878: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access5, changed state to down
*Apr 27 20:34:46.433: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access5, changed state to up
cisco-modem#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 10.10.110.1 YES manual up up
ATM0/0 unassigned YES manual up up
ATM0/0.1 unassigned YES unset up up
Virtual-Access1 unassigned YES unset up up
Dialer0 77.109.**.** YES IPCP up up
Virtual-Access2 unassigned YES unset up up
Virtual-Access3 unassigned YES unset down down
Virtual-Access4 unassigned YES unset down down
Virtual-Access5 unassigned YES unset up up
cisco-modem#ping 77.109.**.**
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 77.109.**.**, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
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