3900 ISR LAN Interface Not Responding To Pings

[Christopher Kofon]

Hi Everyone.

I just configured a new Cisco 3900 router. This is not my first time setting up a router, however this is the first time I have ever had this problem. Below is an excerpt of the config.

ip dhcp excluded-address 192.168.0.1 192.168.0.55
!
ip dhcp pool PHC_HQ_DHCP
network 192.168.0.0 255.255.255.0
default-router 192.168.0.2
domain-name testdomain.com
dns-server 192.168.0.51 192.168.0.50

!
!

!
interface GigabitEthernet0/1
description CONNECTION TO LOCAL AREA NETWORK
ip address 192.168.0.2 255.255.255.0
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
service-policy input MRK_VOICE_TRAFFIC
!

The problem is that though the router assigns IP addresses through DHCP, we cannot seem to ping the router interface, and we are unable to get access to the network (internet and VPN). However when I change the IP address to something else I am to get connectivity and ping responses work.

Thanks in advance.

[Gaurav Mahajan · Accepted solution]

Hi Christopher ,

Is there any specific reason for enabling ip nat outside on LAN facing interface GigabitEthernet0/1.

can you try removing "ip nat outside" from interface GigabitEthernet0/1 and check if ping works.

[Christopher Kofon]

Thanks very much Gaurav. I honestly did not see that. Much appreciated brother.

[Gaurav Mahajan]

No problem Christopher.

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