From 8a50589b1d723b343133d52efae4e087433a147f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20=C5=A0pa=C4=8Dek?= <petr.spacek@nic.cz>
Date: Mon, 3 Feb 2020 15:11:15 +0100
Subject: [PATCH] docs: EDNS bufsize = 1232
---
daemon/bindings/net_dns_tweaks.rst | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/daemon/bindings/net_dns_tweaks.rst b/daemon/bindings/net_dns_tweaks.rst
index baac568b6..7dca906bf 100644
--- a/daemon/bindings/net_dns_tweaks.rst
+++ b/daemon/bindings/net_dns_tweaks.rst
@@ -8,7 +8,7 @@ Default values should not be changed except for very special cases.
.. function:: net.bufsize([udp_downstream_bufsize][, udp_upstream_bufsize])
- Get/set maximum EDNS payload size advertised in DNS packets. Default is 4096 bytes and the default will be lowered to value around 1232 bytes in future, once `DNS Flag Day 2020 <https://dnsflagday.net/2020/>`_ becomes effective.
+ Get/set maximum EDNS payload size advertised in DNS packets. Default is 1232 bytes which was chosed to minimize risk of `issues caused by IP fragmentation <https://blog.apnic.net/2019/07/12/its-time-to-consider-avoiding-ip-fragmentation-in-the-dns/>`_.
Minimal value allowed by standard :rfc:`6891` is 512 bytes, which is equal to DNS packet size without Extension Mechanisms for DNS. Value 1220 bytes is minimum size required by DNSSEC standard :rfc:`4035`.
--
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