[dns-operations] Charter/Spectrum resolver trouble
sethm at rollernet.us
Fri Apr 9 16:39:54 UTC 2021
On 4/8/21 8:48 PM, Seth Mattinen wrote:
> On 4/8/21 10:07 AM, Seth Mattinen wrote:
>> Is there someone from Charter/Spectrum who is responsible for
>> resolvers 18.104.22.168 and 22.214.171.124 on here? I have a customer
>> that's getting SERVFAIL responses from those DNS servers for zones
>> they host. All the usual public DNS and other provider's DNS servers
>> are fine.
> Figured out the issue; there appears to be a routing loop in AS6939 to
> prefix 126.96.36.199/24. Sending traffic out over a different transit AS
> resolves it for now.
One last clarification; after digging by HE the problem is/was Charter
advertising 188.8.131.52/24 and then looping traffic back to HE for
unknown reasons. HE worked around this by filtering the announcement for
184.108.40.206/24 at that point.
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