broken trust chain

Youssef.F...@inwi.ma

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Jul 28, 2020, 7:11:34 PM7/28/20

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Hi All,

I am using Bind as resolver for end users .

At various time, bind logs show "broken trust chain" continuously , for about 20mn ~ 30 mn causing an increase of "recursive clients" shown in "rndc status" and a decrease of "DNS sucess rate KPI" supervised from end users side. then the error disappear and everything is OK.

the problem appears on different server at different time.

What could be the problem?

Regards,

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Merci. »

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Thank you. »

John W. Blue

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Jul 28, 2020, 7:29:47 PM7/28/20

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What version of BIND are you using?

John

Mark Andrews

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Jul 28, 2020, 9:15:36 PM7/28/20

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A network link that is dropping packets can trigger EDNS failures in versions of
BIND before 9.13.3. These versions have code to compensate for servers that
fail to respond to EDNS queries or fail to respond to EDNS queries with DO=1
or fail to respond to queries with (particular) EDNS options set. BIND would
fallback to plain DNS queries to workaround these issues, but that broke
DNSSEC when the answers where coming from a signed zone and the packet loss
is due to network issues.

5029. [func] Workarounds for servers that misbehave when queried
with EDNS have been removed, because these broken
servers and the workarounds for their noncompliance
cause unnecessary delays, increase code complexity,
and prevent deployment of new DNS features. See
https://dnsflagday.net for further details. [GL #150]

> On 29 Jul 2020, at 09:10, <Youssef.F...@inwi.ma> <Youssef.F...@inwi.ma> wrote:
>
> Hi All,
>
> I am using Bind as resolver for end users .
>
> At various time, bind logs show "broken trust chain" continuously , for about 20mn ~ 30 mn causing an increase of "recursive clients" shown in "rndc status" and a decrease of "DNS sucess rate KPI" supervised from end users side. then the error disappear and everything is OK.
>
> the problem appears on different server at different time.
>
> What could be the problem?
>
> Regards,
>
>

> « Ce message et toutes les pièces y jointes sont susceptibles de contenir des informations confidentielles ou privilégiées, lesquelles ne doivent être reproduites, diffusées ou exploitées sans autorisation. L’intégrité des messages électroniques n’étant pas garantie, WANA CORPORATE décline toute responsabilité dans le cas où ce message aurait été altéré, déformé ou falsifié.
>
> Ce message est établi à l'attention exclusive de ses destinataires. Si vous avez reçu ce message par erreur, veuillez le signaler à l’expéditeur et le détruire y compris les pièces jointes.
>
> Merci. »
>
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> « This message and its attachments may contain confidential or privileged information that should not be copied, distributed or used without authorization. As the integrity of emails may not be guaranteed, WANA CORPORATE is not liable for messages that have been modified, changed or falsified.
>
> If you have received this email in error, please notify the sender and delete this message and its attachments.
>
> Thank you. »
>

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--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org

Youssef.F...@inwi.ma

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Jul 29, 2020, 6:32:30 AM7/29/20

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Thank you, Andrews.

De : Mark Andrews <ma...@isc.org>
Envoyé : mercredi 29 juillet 2020 02:15:24
À : Youssef Fassi Fihri
Cc : bind-...@lists.isc.org
Objet : Re: broken trust chain