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@darra268 - Thanks for posting your question on the forum!
Usually, I would say it is not possible to have 2 different ip-helper addresses on the same interface. However, you may be able to workaround this since one of the ports you want to forward is for DHCP.
First, you can set up UDP relay for port 47808 following this guide: Configuring UDP Relay in AOS - Quick Configuration Guide
Then for DHCP, you can use the dhcp relay destination command to specify the IP address you want DHCP requests to forward to. You can set this in the interface configuration with the following syntax:
ip dhcp relay destination <IP address>
An example of how to set this up can be found in this thread: Interface-level "dhcp relay destination" command issues
Please do not hesitate to let us know if you have any further questions.
You can add multiple helper-address statements to the interface configuration. Broadcasts will be sent as unicast to all of the helper addresses. You can specify ports for UDP relay globally but not selectively, so both or all helpers will receive all forwarded broadcasts as unicast. At the application layer the receiving servers should ignore the unwanted traffic.
router(config-eth 0/1)# ip helper-address 10.1.1.1
router(config-eth 0/1)# ip helper-address 10.2.2.2
router(config)# ip forward-protocol udp bootps
router(config)# ip forward-protocol udp 47808
You may also be able to restrict the unwanted traffic with an ACL outbound toward the server(s) receiving the traffic.
router(config-ext-nacl)# deny udp any host 10.1.1.1 eq 47808
router(config-ext-nacl)# deny udp any host 10.2.2.2 eq bootps
router(config-ext-nacl)# permit ip any any
and apply to outbound interface policy. I haven't tested the filtering part but it should work. You may need to treat the source as "self" in the access policy if the Adtran device considers forwarded broadcasts to be self-generated.
Both offered solutions worked up to a point. Because I ended up with a need to forward UDP to 3 different ports and systems, I ended up using the latter. It is working. Thanks!!