Mailing List Archive: mail.nanog.org broken v6 reverse DNS

mail.nanog.org broken v6 reverse DNS

Sep 14, 2023, 10:35 AM

Post #1 of 3 (72 views)

While wondering at high spam scores for NANOG mail, I noticed that it's
in part because of broken reverse DNS for mail.nanog.org's IPv6 address.

The address is 2001:1838:2001:8::20, with reverse delegated to
ns1.scservers.com and ns2.scservers.com... but those hostnames don't
resolve. The auth servers for scservers.com return SERVFAIL.

--
Chris Adams <cma@cmadams.net>

Re: mail.nanog.org broken v6 reverse DNS [ In reply to ]

Bryan at bryanfields

Sep 14, 2023, 11:12 AM

Post #2 of 3 (72 views)

Permalink

On 9/14/23 1:35 PM, Chris Adams wrote:
> While wondering at high spam scores for NANOG mail, I noticed that it's
> in part because of broken reverse DNS for mail.nanog.org's IPv6 address.
>
> The address is 2001:1838:2001:8::20, with reverse delegated to
> ns1.scservers.com and ns2.scservers.com... but those hostnames don't
> resolve. The auth servers for scservers.com return SERVFAIL.

Thanks,

It's being looked at now. I'll updated once it's fixed.
--
Bryan Fields

727-409-1194 - Voice
http://bryanfields.net

Re: mail.nanog.org broken v6 reverse DNS [ In reply to ]

Bryan at bryanfields

Sep 14, 2023, 11:51 AM

Post #3 of 3 (72 views)

Permalink

On 9/14/23 2:12 PM, Bryan Fields wrote:
> On 9/14/23 1:35 PM, Chris Adams wrote:
>> While wondering at high spam scores for NANOG mail, I noticed that it's
>> in part because of broken reverse DNS for mail.nanog.org's IPv6 address.
>>
>> The address is 2001:1838:2001:8::20, with reverse delegated to
>> ns1.scservers.com and ns2.scservers.com... but those hostnames don't
>> resolve. The auth servers for scservers.com return SERVFAIL.
> Thanks,
>
> It's being looked at now. I'll updated once it's fixed.

Our provider has fixed their reverse zones delegation at ARIN. It's working,
but will need ~24 hours for the cached ttl to expire.

Thanks!
--
Bryan Fields

727-409-1194 - Voice
http://bryanfields.net