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This is the support site for Andrews & Arnold Ltd, a UK Internet provider. Information on these pages is generally for our customers but may be useful to others, enjoy!
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==What is an open DNS resolver?==
Every day, each time we use DNS to look up names and IPs on the Internet -
AAISP customers normally use the AAISP DNS servers, or often their own router.
==What if I run a DNS server on purpose?==
It is quite legitimate for people to run DNS servers on their network, and we are happy for them to do so - in these cases access to them should be restricted or limited.
If you run an authoritative DNS server, configure it only to return records for your domain.
If you run a caching resolver, configure it to only return records for your users (firewall to only allow your users), and consider implementing rate-limiting.
You can disable our automatic scanning, see [[#Disabling Automatic Scans]] below.
=How to prevent this?=
See the pages below for details on specific routers
=Automatic and Manual Testing for
There is a page on the AAISP control pages that lists your IPs that have an open DNS server running, and can also re-scan your IP blocks (IPv4). AAISP will re-scan automatically every
Log in to the [https://
==Disabling Automatic Scans==
[[File:DNS-Check-flag.png|border]]
You will still be able to run the checks manually.
[[Category:
[[Category:DNS]]
[[Category:Diagnostic Tools]]
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