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Reserved DNS header flag is echoed/dropped/formerr #91

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marka63 opened this issue May 12, 2019 · 1 comment
Open

Reserved DNS header flag is echoed/dropped/formerr #91

marka63 opened this issue May 12, 2019 · 1 comment

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@marka63
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marka63 commented May 12, 2019

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@marka63 marka63 changed the title Reserved DNS header flag is echo/dropped/formerr Reserved DNS header flag is echoed/dropped/formerr May 12, 2019
@vttale
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vttale commented May 12, 2019

Specifically the Z bit. Mark's been doing tests that show that if it is set in the request then various misbehaviours occur with regard to the response. Per his message to dns-operations on 10 May 2019:

"I m currently testing the handling of the last remaining DNS header
flag by DNS servers for the Alexa Top 1 Million sites. At this stage
I m approaching 200000 sites and have a 11% misbehaviour rate where
the servers echo back the flag. If we ever want to use this flag in
the future we need to fix this issue now well before we start using
the flag."

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@marka63 @vttale