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Just to follow up, these bad routes stopped being advertised around 20:00
UTC yesterday, and we're able to reach CentralNic addresses normally now
without any filters in place.
-Dan
Dan McCombs
Senior Engineer I - DNS
[email protected]
On Mon, Jan 29, 2024 at 3:08 PM Dan McCombs <[email protected]>
wrote:
> We're seeing issues reaching CentralNic managed nameservers *.nic.(online,
> tech, xyl, space, etc.) in Europe as well. It looks like their prefixes are
> being hijacked by China Mobile and being advertised by FLAG telecom. We had
> to filter out those routes in order to reach them again.
>
> Anyone on this list from CentralNic that could look into things?
>
> -Dan
>
>
> Dan McCombs
> Senior Engineer I - DNS
> [email protected]
>
>
> On Mon, Jan 29, 2024 at 2:53 PM A. Schulze via dns-operations <
> [email protected]> wrote:
>
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: "A. Schulze" <[email protected]>
>> To: "[email protected]" <
>> [email protected]>
>> Cc:
>> Bcc:
>> Date: Mon, 29 Jan 2024 20:50:00 +0100
>> Subject: hosting. nameservers partial unreachable
>> Hello,
>>
>> to day I noticed unreachable nameserver [a-d].nic.hosting. via IPv4
>> approved by at least two locations by such script:
>>
>> for transport in tcp notcp; do
>> for protocol in 4 6; do
>> for host in a b c d; do
>> printf "${host}.nic.hosting/${protocol}/${transport}:"
>> if dig -${protocol} @${host}.nic.hosting. hosting. soa +timeout=1
>> +retry=1 +short +${transport} 2>/dev/null | grep --silent
>> hostmaster.centralnic.net; then
>> printf "ok\n";
>> else
>> printf "fail\n";
>> fi
>> done
>> done
>> done
>>
>> from AS31334 and AS15451:
>>
>> a.nic.hosting/4/tcp:fail
>> b.nic.hosting/4/tcp:fail
>> c.nic.hosting/4/tcp:fail
>> d.nic.hosting/4/tcp:fail
>> a.nic.hosting/6/tcp:ok
>> b.nic.hosting/6/tcp:ok
>> c.nic.hosting/6/tcp:ok
>> d.nic.hosting/6/tcp:ok
>> a.nic.hosting/4/notcp:fail
>> b.nic.hosting/4/notcp:fail
>> c.nic.hosting/4/notcp:fail
>> d.nic.hosting/4/notcp:fail
>> a.nic.hosting/6/notcp:ok
>> b.nic.hosting/6/notcp:ok
>> c.nic.hosting/6/notcp:ok
>> d.nic.hosting/6/notcp:ok
>>
>> from other locations I got 16x ok
>> Sometimes I also saw some OK for IPv4, too bit resolver so not retry as
>> often.
>>
>> Any hints?
>> Andreas
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: "A. Schulze via dns-operations" <[email protected]>
>> To: "[email protected]" <
>> [email protected]>
>> Cc:
>> Bcc:
>> Date: Mon, 29 Jan 2024 20:50:00 +0100
>> Subject: [dns-operations] hosting. nameservers partial unreachable
>> _______________________________________________
>> dns-operations mailing list
>> [email protected]
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>>
>
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