From: Petr Špaček <petr.spacek@nic.cz>
Date: Mon, 3 Feb 2020 14:11:15 +0000 (+0100)
Subject: docs: EDNS bufsize = 1232
X-Git-Tag: v5.2.0~7^2~1
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8a50589b1d723b343133d52efae4e087433a147f;p=thirdparty%2Fknot-resolver.git

docs: EDNS bufsize = 1232
---

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`.