In this example Router, Eth 0/1 is connected to ISP and gets DHCP IP address
Ethernet 0/1 connects to the LAN side, the Switch acting as Layer 2 and default VLAN1
interface Ethernet0/1
ip address dhcp
ip nat outside
ip virtual-reassembly in
duplex auto
no shut
!
interface Ethernet0/0
ip address 10.10.10.1 255.255.255.0
ip nat inside
ip virtual-reassembly in
duplex auto
no shut
!
!
ip nat inside source list 20 interface Ethernet0/1 overload
ip route 0.0.0.0 0.0.0.0 Ethernet0/1 dhcp
!
!
!
access-list 20 permit 10.10.10.0 0.0.0.255
Happy Labbbing ……………!