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

[Martin T]

Alex,

I understand this the same way, but for some reason there are
"dhcp-option82" configuration options under "helpers bootp". Looks
like at least on some platform(EX  series switches) those
configuration options really do behave as DHCP option82 settings under
"dhcp-relay":

http://www.juniper.net/techpubs/en_US/junos9.3/topics/example/port-security-dhcp-option82-with-switch-as-relay-agent.html


regards,
martin

2012/9/17 Alex Arseniev <alex.arseniev at gmail.com>:
> 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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>