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What does the _ip helper-address command do on a router?
Supports the assignment of IP addresses without the need of a DHCP server.
Assigns the local router to be the DHCP server
Resolves address overlapping problems with DHCP messages.
Forwards DHCP messages between client and server.
Large networks usually use DHCP servers located at a centralized site, which assigning IP addresses to many remote hosts. The routers connecting the networks need to somehow relay DHCP messages between clients and DHCP server. On a routers LAN interface the command ip helper-address [server-ip] identifies the DHCP Server by its IP address.
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