[Dnsmasq-discuss] dhcp-relay and option 82

Mani Wieser test_drive_123 at outlook.com
Mon Dec 7 13:58:32 GMT 2020


On 07.12.2020 00:38, Simon Kelley wrote:
> On 02/12/2020 10:33, Mani Wieser wrote:
>> Dear all
>> I am trying to use dnsmask as dhcp relay in dd-wrt as a substitution to
>> their buggy dhcpfwd solution. It works fine, but I can't find a way to
>> inject option 82.
>> I tried with
>> dhcp-circuitid=set:82,1,"ws-c"
>> dhcp-remoteid=set:"ws-c"
>> dhcp-option-force=82,1,"dd-wrt"
>>
>> without success.
>>
>> I found a similar question without an answer at July 2017
>>
>> Is it possible? if yes: what I am doing wrong?
>>
>> Mani
>>
>>
> Not possible, I'm afraid. The dhcp-relay function is a basic rewriting
> of the giaddr field, it doesn't add any options.
>
> Simon.
>
>
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Thanks Simon

In the meantime I found a solution:  I set the server-identifier to the 
relay IP and therefore the client in the subnet can't bypass the relay 
anymore.

The tricky part was to find out how to extract the gateway address in 
isc-dhcp-server;... much more hidden in dhcp6; but I solved it.

Mani




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