troubleshooting Question

Cisco ASA NAT not working???

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huffmanaFlag for United States of America asked on
* ASACiscoNetworking
17 Comments1 Solution137 ViewsLast Modified:
I can't get my ASA NAT to work.  I'm testing to configure the firewall for our shop by simulating it on our local network.  The ISP router is at  The ASA can ping out to the internet but the PC can't.

The PC picks up DHCP OK and can ping (ASA GigabitEthernet0/1), but it can't ping the default gateway ASA (ASA GigabitEthernet0/0) or beyond.

interface GigabitEthernet0/0
 nameif outside
 security-level 0
 ip address
interface GigabitEthernet0/1
 nameif inside
 security-level 100
 ip address
interface GigabitEthernet0/3
 nameif mngt
 security-level 0
 ip address
 icmp permit any mngt
 icmp permit any inside
 icmp permit any outside
object network INSIDE-SUBNET
nat (inside,outside) source dynamic INSIDE-SUBNET interface
route outside 5

  dhcpd address - inside
  dhcpd address inside
  dhcpd address inside
  dhcp dns
  dhcpd dns
  dhcpd lease 3000
  dhcpd domain
  dhcpd ping_timeout 20
  dhcpd option 3
  dhcpd option 3 ip
  dhcpd enable inside
  dhcpd option 2 ascii dhcpd_option_2_ascii_examplestring_HERE

---- ASA GigabitEthernet0/1 -> switch on inside of the ASA ----
interface FastEthernet0/1
des to_ASA_GigabitEthernet0/1_inside
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 200
 switchport trunk allowed vlan 1,200
 switchport mode trunk
----PC -> witch on inside of the ASA ----
interface FastEthernet0/2
 des PC_to_Switch_on_the_inside_of_ASA
 switchport access vlan 200
 switchport mode access
Pete Long
Solutions Architect
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