Re: [DNSOP] draft-tale-dnsop-edns-clientid

Ray Bellis <ray@bellis.me.uk> Thu, 30 March 2017 23:54 UTC

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From: Ray Bellis <ray@bellis.me.uk>
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Subject: Re: [DNSOP] draft-tale-dnsop-edns-clientid
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On 30/03/2017 16:48, Mark Andrews wrote:
> 
> I'm going to assume these two proposals can be merged.
> 
> The simple way to do this is to *always* add a OPT record that only
> contains this option to the end of the packet adjusting the additional
> section count.  This OPT record is removed and the additional section
> count is adjusted prior to TSIG / SIG(0) verification.
> 
> When replying via the front end, you always add a OPT record to the
> end of the packet after TSIG / SIG(0) computation adjusting the
> additional section count.  This is removed by the front end adjusting
> the additional section count.
> 
> This allows for TSIG, SIG(0) and plain DNS to be handled gracefully.
> Any other options like destination address can be added to this OPT
> record.
> 
> If people really object to two OPT records we can do a OPT clone.

Interesting, although I'd be curious how we'd avoid and/or change the
rules for TSIG that say it MUST always come last in the packet.

Ray