Re: OT: Client DNS resolver crashing on NAPTR lookup

Hello Benoit,

NAPTR is not much used, so its unfortunately expected to hit some bugs when used in a new platform. About the specific clients I cannot comment, sorry.

Funny/sad story, some hosting provider even in Germany removed NAPTR support from the DNS backends, because they did not saw any customer usage and/or don't understand it.

Cheers,

Henning

> -----Original Message-----
> From: Benoit Panizzon via sr-users <[email protected]>
> Sent: Montag, 28. April 2025 16:31
> To: [email protected]
> Cc: Benoit Panizzon <[email protected]>
> Subject: [SR-Users] OT: Client DNS resolver crashing on NAPTR lookup
> 
> Hi List
> 
> I hope it is OK to post a slightly off topic question. I have not found any similar
> reports via google.
> 
> During testing of our development platform, I found two independent clients
> whose resolver process crashes randomly, when performing NAPTR lookups.
> 
> Mitel/Aastra 68XXi Phones with Firmware >= 6.4 up to most recent.
> 
> Inalp/Patton SNXX (Trinity OS) SIP Gateway with Firmware >= 3.14.X up to
> most recent.
> 
> Both vendors reply they have no prior reports of this issue.
> 
> The hostname used as registrar / proxy points to a NAPTR entry, which in turn
> points to 3 SRV entries für SIP+D2T, SIP+D2U, SIPS+D2T
> 
> Each SRV entry then points to 4 IP Addresses (2x ipv4 and 2x ipv6)
> 
> So quite a complex lookup and quite large replies. Anyone else observed this
> issue?
> 
> When using a hostname that merely points to the A and AAAA records, no
> crashes.
> 
> Mit freundlichen Grüssen
> 
> -Benoît Panizzon-
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