! ==========================================
! Router ISP (Upstream Simulated Internet Service Provider)
! Lab: Static NAT and Inside Server Publishing (PTL-0021)
! ==========================================
enable
configure terminal
hostname ISP
no ip domain-lookup

! Link to Enterprise Edge Router R1
interface GigabitEthernet0/0/0
 description Link to R1 Enterprise Edge
 ip address 203.0.113.2 255.255.255.248
 duplex auto
 speed auto
 no shutdown
 exit

! Link to Simulated External / Public Client Subnet
interface GigabitEthernet0/0/1
 description Link to External Internet Client Network
 ip address 198.51.100.1 255.255.255.0
 duplex auto
 speed auto
 no shutdown
 exit

end
copy running-config startup-config