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ietf-wg-dnsop / draft-ietf-dnsop-avoid-fragmentation

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Robert Wilton DISCUSS (1) #5

Closed vixie closed 9 months ago

vixie commented 10 months ago

(1) p 3, sec 3.1. Recommendations for UDP responders

At the time of writing, most DNS server software did not set the DF bit for IPv4, and many OS kernel constraints make it difficult to set the DF bit in all cases. Best Current Practice documents should not specify what is currently impossible, so R2, which is setting the DF bit, is "MAY" rather than "SHOULD".

I think that this recommendation, particularly because it is using RFC 2119 language, is unclear. I would suggest rephasing this to something like:

R2. Where supported, UDP responders SHOULD set IP "Don't Fragment flag (DF) bit" [RFC0791] on IPv4.

paulwouters commented 9 months ago

proposed in PR already in response to similar ballot comments.

vixie commented 9 months ago

i can live with "where supported".