I have a 2600 router which is link to my ISP ADSL which I get a DHCP IP from them, I have config the interface to take the DHCP from the ADSL, I have config NAT overload on the outside interface, however I am unable to access the internet from the LAN, when I try to ping the ISP DNS server from the router it works but when I try to ping ISP DNS from the LAN if fail. Can anyone tell me what step I am not doing to get access to the internet?
I am able to ping the IP address I got from the ADSL from the LAN.
I noticed a number of things in your config.
1) in the DHCP config, you need to exclude your router IP address for the pool that your router will be leasing out to its clients.
from the global config, please put the following command to exclude the first two ip address from the dhcp pool.
ip dhcp excluded-address 192.168.10.1 192.168.10.2
2) I also noticed that you are using the router as a dhcp client to your ISP. but you still have a static default route. please remove the default route and the static route also pointing to the outside interface.
ip route 0.0.0.0 0.0.0.0 18.104.22.168
ip route 192.168.2.0 255.255.255.0 FastEthernet0/0