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Configuring the DHCP helper service in Cisco IOS
Problem:
Clients on a network connected via a Cisco router running IOS needs to get IP addresses assigned via DHCP
 
Solution:
On the relevant interface, add one "ip dhcp-helper" statement for each DHCP server:

interface Ethernet1
description Connected to DHCP clients
ip address 10.0.1.1 255.255.255.0
ip helper-address 195.159.120.8
ip helper-address 195.159.120.10
ip nat inside



 
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