Can't ping internal network from router

[romy786]

Hello,

I can't ping internal network from router although my network is running and all devices can use internet. I am using one router c1801 with three catalyst 3550 switches. Here is my running configuration.

Building configuration...

Current configuration : 1326 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname G3R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
!
!
!
!
!
!
!
ip cef
ip name-server 203.128.3.18
ip name-server 203.128.7.10
no ipv6 cef
!
multilink bundle-name authenticated
!
!
archive
log config
hidekeys
!
!
!
!
!
interface FastEthernet0
ip address 122.129.85.69 255.255.255.248
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
!
interface BRI0
no ip address
encapsulation hdlc
shutdown
!
interface FastEthernet1
switchport access vlan 10
!
interface FastEthernet2
!
interface FastEthernet3
!
interface FastEthernet4
!
interface FastEthernet5
!
interface FastEthernet6
!
interface FastEthernet7
!
interface FastEthernet8
!
interface ATM0
no ip address
shutdown
no atm ilmi-keepalive
dsl operating-mode auto
!
interface Vlan1
no ip address
!
interface Vlan10
ip address 192.168.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 122.129.85.65
!
!
no ip http server
no ip http secure-server
ip nat inside source list 1 interface FastEthernet0 overload
!
access-list 1 permit 192.168.1.0 0.0.0.255
!
!
!
!
!
!
control-plane
!
!
line con 0
line aux 0
line vty 0 4
login
!

!
webvpn cef
end

[Georg Pauwen]

Hello.

with internal network I assume you mean the 192.168.1.0/24 network ? The router config looks ok, can you post the config of one of the 3550s ?

[Richard Burts]

I agree with Georg that I do not see any obvious issues in the router config. As a first step in investigating this would you provide the output of these steps

1) show arp

2) attempt the ping

3) show arp

HTH

Rick

[Richard Burts]

After posting my first response I have an additional thought. Is it possible that the device on the internal network has a firewall implemented that is not allowing the ping? Can you ping that device from one of the switches or ping from another device in the internal network?

HTH

Rick