Hi Eoin,

Unless you refer to something specific, Unbound supports EDNS since the very early versions (0.4 or so).

Applying arbitrary EDNS options is not something that is supported out-of-the-box; you could write your own module (C or Python) to do that.

You could also (ab)use:
        edns-client-string: 0.0.0.0/0 '<ASCII string>'
        edns-client-string-opcode: <EDNS option code>

to set the EDNS option to all outgoing traffic if ASCII is workable for you or if you only care about the option code being there (with an empty ASCII string). However you cannot dynamically change these options via unbound-control IIRC.

Best regards,
-- George

On 21/10/2021 12:30, Eoin Norris via Unbound-users wrote:
Hi guys

Quick question. I am using unbound as a simple forwarding server. We had rolled 
our own EDNS support, but we need to update to the latest .

  I see that unbound has added some EDNS support in recent releases. What we 
need is to be able to add EDNS data from another app to each datagram, via the 
control. This data will be consistent for  the lifetime of the app.  Anyway is 
this something that is possible now?

Thanks

Eoin

  • Unbound and EDNS Eoin Norris via Unbound-users
    • Re: Unbound and EDNS George Thessalonikefs via Unbound-users

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