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Webcast-Catalyst9k
New Member

Bootp Relay agent

I have a 2610 with 2 ethernet cards and the IOS version is 12.2(16a). The subnets are 172.16.0.0/16 and 172.25.0.0/16. I need to enable bootp relay agent on one of the interface so the clients on 172.25.0.0/16 subnet can obtain IP addresses from a dhcp server whcih resides on 172.16.0.0/16 subnet.

How can I go about enable the bootp relay agent on the router if it's possible.

3 REPLIES
Silver

Re: Bootp Relay agent

You need to configure IP Helper address on the cisco router. On the interface of 172.25.0.0, configure

ip helper-address a.b.c.d where a.b.c.d is the ip address of the dhcp server.

New Member

Re: Bootp Relay agent

do I also need to enable bootp relay agent in addition to ip helper?

Thx

Silver

Re: Bootp Relay agent

The ip helper address enables for the bootp also. It actually translates the UDP broadcast on one LAN into unicast packets destined for the address specified. Hence, DHCP, BOOTP, WINS etc will be able to work across routers, or any other appilcation that require UDP broadcast to work. To enable for a specific port, use the ip forward protocol to specify the port you want enabled in global configuration mode

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