EDNS exchanges in draft-wouters-edns-tcp-chain-query-00.txt

Olaf Kolkman <[email protected]> Thu, 31 Oct 2013 14:03:23 +0100

Newsgroups	gmane.ietf.dnsext
Message-ID	<[email protected]>

On 11 sep. 2013, at 03:15, Paul Wouters <[email protected]> wrote:

> 
> Filename:	 draft-wouters-edns-tcp-chain-query
> Revision:	 00
> Title:		 TCP chain query requests in DNS
> Creation date:	 2013-09-10
> Group:		 Individual Submission

Thanks Paul, 

Hereby a few responses after first review.

In 3.3.2 you specify that you MAY include the ENDS option in responses.

I am not sure if there are clients out there that get all nauseous from OPT RRs in the responses and I am also not sure if this would be the first EDNS exchange where a server sends back an OPT RR in the additional section without first having received an EDNS packet from a client.

If conservatism is warranted  I’d suggest to only send back an OPT RR to clients that have shown EDNS support by sending you a query first.

NIT: if you are going to ignore the timeout anyway on the server then a SHOULD set to 0 for clients is sufficient. Violating that MUST doesn’t lead to interoperability issues if the server ignores the value anyhow.

—Olaf

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