troubleshooting Question

Cisco router can reach internet but attached switch and PC can not.

Avatar of Ian Price
Ian PriceFlag for United Kingdom of Great Britain and Northern Ireland asked on
4 Comments1 Solution22 ViewsLast Modified:
We are trying to setup some lab kit in the office real physical kit i've used packet tracer to draw out it thought, we have a  Cisco router Int 0/0 which is getting an IP address via DHCP from our internet router this is set as the outside interface for NAT. Then Int 0/1 has a static IP on this is set as the inside interface for NAT. If I ping from the router using source address (Inside interface) the ping works fine.
 We thought at first it was a routing problem, but if that was the case how would the router be able to reach the internet.
 The Nat is working as I can see the translations
 PC & Int Vlan 1 on the switch can both ping (Outside interface) but can not reach

Description automatically generated
 interface FastEthernet0/0
  ip address dhcp
  ip nat outside
  duplex auto
  speed auto
 interface FastEthernet0/1
  ip address
  ip nat inside
  duplex auto
  speed auto
 ip nat inside source list 1 interface FastEthernet0/0 overload
 access-list 1 permit 
 IT_Router#ping source
 Type escape sequence to abort.
 Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
 Packet sent with a source address of
 IT_Router#show ip nat translations
 Pro Inside global      Inside local       Outside local      Outside global
Benjamin Van Ditmars
Sr Network Engineer

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