Lab — DHCP Server & Relay

🎯 Obiettivi

🗺️ Topologia

📖 Guida

R1 è il DHCP server per LAN-A (192.168.1.0/24) e LAN-B (192.168.2.0/24). R2 connette LAN-B e agisce da relay agent. I PC devono ottenere IP automaticamente via DHCP.

DHCP Server (R1) + Relay (R2)

🖥️ LAN-A
192.168.1.0/24
PC1, PC2

—Gi0/0—

R1
DHCP Server

—Gi0/1(.1|.2)—

R2
Relay Agent

—Gi0/0—

🖧 LAN-B
192.168.2.0/24
PC3

IP pre-configurati:
R1 Gi0/0: 192.168.1.1/24, Gi0/1: 10.0.0.1/30
R2 Gi0/1: 10.0.0.2/30, Gi0/0: 192.168.2.1/24
Route statiche già configurate (R1↔R2)
PC1, PC2: LAN-A (DHCP) | PC3: LAN-B (DHCP via relay)

1R1: Escludi gli IP statici

ip dhcp excluded-address 192.168.1.1 192.168.1.10
ip dhcp excluded-address 192.168.2.1 192.168.2.10

2R1: Pool LAN-A

ip dhcp pool LAN-A
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 8.8.8.8

3R1: Pool LAN-B

ip dhcp pool LAN-B
network 192.168.2.0 255.255.255.0
default-router 192.168.2.1
dns-server 8.8.8.8

4R2: Relay Agent

int Gi0/0
ip helper-address 10.0.0.1
Inoltra il broadcast DHCP da LAN-B a R1

5PC: Richiedi IP

Da PC1/PC2/PC3: dhcp request
Su R1: show ip dhcp binding

💡 PC3 è su LAN-B — il broadcast DHCP non raggiunge R1 senza il relay agent (ip helper-address) su R2!

R1 — Console

PC1

PC2

PC3

R1>