Cisco 877 Issue - Could be Nat?

Phil Bartlett · ‎03-03-2014

Hi

I'm setting up a VDSL/ADSL2+ DSLAM in test lab. I'm using a Cisco877 to test out the intial config. The 877 can connect and sync however it cant ping any devices on the DLSAM network .The CISCO877 is configured to use NAT and i think NAT is the issue here. Its has been sometime since i configured NAT and i'm sure it is something relativility simple.

DSLAM network is 10.3.1.x

CISCO877 Internal network 192.168.99.x

Config of the CISCO877

version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
!
no aaa new-model
!
!
dot11 syslog
ip source-route
!
!
ip cef
ip domain name comtek.co.uk
!
!
!
!
!
!
!
archive
log config
hidekeys
!
!
!
bridge irb
!
!
interface ATM0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
no atm ilmi-keepalive
dsl enable-training-log
!
interface ATM0.1 point-to-point
description DSL Link
ip virtual-reassembly
atm route-bridged ip
pvc 8/35
encapsulation aal5snap
!
bridge-group 1
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface Vlan1
ip address 192.168.99.1 255.255.255.0
ip nat inside
ip virtual-reassembly
!
interface BVI1
ip address 10.3.1.12 255.255.255.0
ip nat outside
ip virtual-reassembly
!
no ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 10.3.1.1
no ip http server
no ip http secure-server
!
ip nat inside source list 101 interface BVI1 overload
!
access-list 101 permit ip 192.168.99.0 0.0.0.255 any
!
!
!
!
control-plane
!
bridge 1 protocol ieee
bridge 1 route ip
!
line con 0
no modem enable
line aux 0
line vty 0 4
login
!
scheduler max-task-time 5000
end

Router#sh arp
Protocol Address          Age (min) Hardware Addr   Type   Interface
Internet 10.3.1.1                0   0018.19f3.f3e2 ARPA   BVI1
Internet 10.3.1.12               -   0000.0caa.8871 ARPA   BVI1
Internet 10.3.1.217              1   0024.d7e8.8624 ARPA   BVI1
Internet 10.3.1.250              2   0000.39a9.4fc6 ARPA   BVI1
Internet 192.168.99.1            -   001c.b1ec.0c62 ARPA   Vlan1
Router#ping 10.3.1.1

Sending 5, 100-byte ICMP Echos to 10.3.1.1, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5) Sending 5, 100-byte ICMP Echos to 10.3.1.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)