Confused about DHCP-Relay Interfaces ?!

General questions
1

Hi,

I have been goung through DHCP Relay — VyOS 1.5.x but not able to make sense of the below, I’m not clear what is the purpose of the 1st command below, and which interface to use for my case.

set service dhcp-relay interface <interface>

set service dhcp-relay listen-interface <interface>

set service dhcp-relay upstream-interface <interface>

I have sub-Interfaces for VLANs configured as below…

Interface    IP Address        MAC                VRF        MTU  S/L    Description
-----------  ----------------  -----------------  -------  -----  -----  -------------
eth0.3130    10.31.30.12/24    00:0c:29:71:c2:2f  default   1500  u/u
             10.31.30.11/24
eth1.3150    10.31.50.12/24    00:0c:29:71:c2:39  default   9000  u/u
             10.31.50.11/24

DHCP request is going to come from eth1.3150, and suppose to go to eth0.3130.

Then I’m not clear which interface to use for the command set service dhcp-relay interface <interface>

Can this be clarified please.

Thank You

2

The docs you linked to provide the answer: " A warning message will be shown if this command is used, since new implementations should use listen-interface and upstream-interface"

So, don’t use the first command.

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3

Thanks @tjh for confirming, I had thought so too, its clear now…

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