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Message-ID: <CALojpv+2RkHaRQ_JaeVxoXF=uP7_RK3a6D1FDD5HvurteS9n7A@mail.gmail.com>
Date: Tue, 3 Nov 2020 17:41:04 +0000
From: Bartłomiej Palmowski <bart@...nt.com>
To: musl@...ts.openwall.com
Subject: EDNS0 support?
Hi,
we run alpine based docker images in AWS (inside our VPCs). Which
means that we're using dns servers provided by the AWS[1]. The problem
arises when we want to resolve a dns record that yields a large
response, for example:
$ nslookup eu.data.logs.insight.rapid7.com
Server: 10.11.12.13
Address: 10.11.12.13:53
Non-authoritative answer:
*** Can't find eu.data.logs.insight.rapid7.com: No answer
Non-authoritative answer:
*** Can't find eu.data.logs.insight.rapid7.com: No answer
According to what I managed to find out the reasons are as follows:
* edns0 is not advertise by the resolver
* there is no retry with TCP
Please advise on how we could reconfigure our images so that we're
able to resolve records with lots of RRs with a musl resolver.
1 - https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/DNSBehavior.html
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