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AT&T Internet T1 on Cisco 1720

Posted on 2009-05-07
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Last Modified: 2012-06-27
Here is my curent running config. I can ping the outside world from within the router, but my test workstation can't. If I trace the route it hits the Ethernet side and then dies. Any ideas?? it's making me crazy.
Current configuration:
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname cct_T1
!
!
!
!
!
!
memory-size iomem 25
ip subnet-zero
ip name-server 68.94.156.1
ip name-server 68.94.157.1
!
!
!
!
interface Serial0
 ip address 12.xxx.xx.xxx 255.255.255.252
 encapsulation ppp
 service-module t1 lbo -7.5db
 service-module t1 timeslots 1-24
!
interface Serial1
 no ip address
 shutdown
!
interface FastEthernet0
 ip address 192.168.xx.xxx 255.255.255.0 secondary
 ip address 12.xxx.xx.xx 255.255.255.252
 speed auto
 half-duplex
!
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0
no ip http server
!
!
line con 0
 transport input none
line aux 0
line vty 0 4
 password png
 login
!
no scheduler allocate
end
 
cct_T1#

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Question by:medea27
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Expert Comment

by:JFrederick29
ID: 24328405
Is your test PC configured with a 192.168.x.x IP? or a public IP?

If the 192.168.x.x IP, you need to configure NAT:

conf t
int s0
ip nat outside

int f0
ip nat inside

access-list 1 permit 192.168.x.0 0.0.0.255

ip nat inside source list 1 interface Serial0 overload
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Author Comment

by:medea27
ID: 24328730
No, I have my test PC setup with a public address. I orginally configured the router with NAT, but took it off to test.
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LVL 43

Expert Comment

by:JFrederick29
ID: 24328841
The test PC has a default gateway of the 12.x.x.x IP address on the F0 interface, right?  It also has DNS servers (your ISP's DNS servers)?
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Author Comment

by:medea27
ID: 24328958
Yes to both questions.
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Accepted Solution

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medea27 earned 0 total points
ID: 24329037
Problem solved. Wrong mask on the F0 public address. AT&T gave me incorrect info. Thanks anyway!
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