! ==========================================
! Router R2 (Central Headquarters & IOS DHCP Server)
! Lab: Configuring Cisco IOS DHCPv4 Server and Relay Agent (PTL-0012)
! ==========================================
enable
configure terminal
hostname R2

! Exclude statically assigned IP addresses before pool creation
! Exclude .1 through .10 on Branch Subnet (protects gateway R1 Gi0/0/0 and future static hosts)
ip dhcp excluded-address 192.168.10.1 192.168.10.10

! Exclude .1 through .10 on HQ Subnet (protects gateway R2 Gi0/0/0 and management devices)
ip dhcp excluded-address 192.168.20.1 192.168.20.10

! ------------------------------------------
! DHCP Pool for Remote Branch LAN (Serviced via R1 Relay Agent)
! ------------------------------------------
ip dhcp pool BRANCH_POOL
 network 192.168.10.0 255.255.255.0
 default-router 192.168.10.1
 dns-server 208.67.222.222
 domain-name lab.local
 exit

! ------------------------------------------
! DHCP Pool for Local HQ LAN
! ------------------------------------------
ip dhcp pool HQ_POOL
 network 192.168.20.0 255.255.255.0
 default-router 192.168.20.1
 dns-server 208.67.222.222
 domain-name lab.local
 exit

! Routed Transit Interface to Branch Router R1
interface GigabitEthernet0/0/1
 description Routed Transit Link to R1
 ip address 10.0.0.2 255.255.255.252
 no shutdown
 exit

! HQ Local LAN Interface
interface GigabitEthernet0/0/0
 description HQ Client LAN
 ip address 192.168.20.1 255.255.255.0
 no shutdown
 exit

! Static Route returning traffic to Remote Branch Subnet via R1
ip route 192.168.10.0 255.255.255.0 10.0.0.1

end
copy running-config startup-config