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Dynamic Host Configuration Protocol | 321
Figure 13-4. Configuring Dell Force10 Systems as a DHCP Relay Device
To view the ip helper-address configuration for an interface, use the command show ip interface from
EXEC privilege mode, Figure 250.
Figure 13-5. Displaying the Helper Address Configuration
Configure Secure DHCP
DHCP as defined by RFC 2131 provides no authentication or security mechanisms. Secure DHCP is a
suite of features that protects networks that use dynamic address allocation from spoofing and attacks.
• Option 82 on page 322
DHCP 0
01
R1(conf-if-gi-1/3)#show config
!
interface GigabitEthernet 1/3
ip address 10.11.0.3/24
ip helper-address 10.11.1.5
ip helper-address 10.11.2.5
no shutdown
1/3
Unicast
DHCP Server
10.11.1.5
DHCP Server
10.11.2.5
Broadcast
Source IP : 10.11.1.5
Destination IP: 255.255.255.255
Source Port: 67
Destination Port: 68
Unicast
Source IP : 0.0.0.0
Destination IP: 10.11.1.5
Source Port: 68
Destination Port: 67
Relay Agent Address: 10.11.0.3
1/4
Unicast
Source IP : 10.11.1.5
Destination IP: 10.11.0.3
Source Port: 67
Destination Port: 68
Broadcast
Source IP : 0.0.0.0
Destination IP: 255.255.255.255
Source Port: 68
Destination Port: 67
Relay Agent Address: 0.0.0.0
R1_E600#show ip int gig 1/3
GigabitEthernet 1/3 is up, line protocol is down
Internet address is 10.11.0.1/24
Broadcast address is 10.11.0.255
Address determined by user input
IP MTU is 1500 bytes
Helper address is 192.168.0.1
192.168.0.2
Directed broadcast forwarding is disabled
Proxy ARP is enabled
Split Horizon is enabled
Poison Reverse is disabled
ICMP redirects are not sent
ICMP unreachables are not sent