[j-nsp] DHCP option 82 under "forwarding-options helpers bootp"configuration

[Alex Arseniev]

Hello there,
"forwarding-options helpers bootp" is not DHCP relay, it is a different 
feature although they both use same socket.
To insert option 82, you need "forwarding-option dhcp-relay" feature which 
requires a license.
BOOTP helper and dhcp-relay|dhcp-local-server cannot be configured together 
( see above).
dhcp-relay and dhcp-local-server can be configured together in different 
VRs/VRFs.
Thanks
Alex

----- Original Message ----- 
From: "Martin T" <m4rtntns at gmail.com>
To: <juniper-nsp at puck.nether.net>
Sent: Monday, September 17, 2012 1:15 PM
Subject: [j-nsp] DHCP option 82 under "forwarding-options helpers 
bootp"configuration


> Hi,
>
> JUNOS(10.4R9.2 at M10i) supports DHCP relay agent information option
> configuration under "forwarding-options helpers bootp". However,
> despite the configuration, DHCP messages received by DHCP server do
> not have option 82 present. For example I made such configuration:
>
> root at labM10i> show configuration forwarding-options helpers bootp
> dhcp-option82 {
>    circuit-id {
>        use-vlan-id;
>    }
>    remote-id {
>        use-string test;
>    }
>    vendor-id {
>        test;
>    }
> }
> description "helpers bootp test";
> server 10.10.10.1;
> interface {
>    ge-1/2/0.5;
> }
>
> root at labM10i>
>
> ..and executed dhclient in a broadcast domain associated with
> interface ge-1/2/0.5. Packet capture results on a 10.10.10.1 DHCP
> server can be seen here: http://cloudshark.org/captures/e963f493caf8
> As you can see, there is no option 82 added.
>
>
> Is it possible to add DHCP option 82 to messages forwarded to DHCP
> server under "forwarding-options helpers bootp" configuration? Or is
> this possible only with "dhcp-relay"? Latter would make more sense as
> this option should be strictly DHCP
> option(http://tools.ietf.org/html/rfc3046) not the BOOTP option?
>
>
> regards,
> martin
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