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From eb92fb32b746f2104b0f370b5b295bb8dd4bd5e5 Mon Sep 17 00:00:00 2001
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From: Simon Kelley <simon@thekelleys.org.uk>
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Date: Tue, 7 Mar 2023 22:07:46 +0000
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Subject: [PATCH] Set the default maximum DNS UDP packet size to 1232.
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http://www.dnsflagday.net/2020/ refers.
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Thanks to Xiang Li for the prompt.
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---
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CHANGELOG | 9 ++++++++-
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man/dnsmasq.8 | 3 ++-
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src/config.h | 2 +-
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3 files changed, 11 insertions(+), 3 deletions(-)
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--- CHANGELOG.orig
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+++ CHANGELOG
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@@ -11,7 +11,14 @@ version 2.89
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for reporting the bug and for his great efforts in chasing
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it down.
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+ Set the default maximum DNS UDP packet sice to 1232. This
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+ has been the recommended value since 2020 because it's the
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+ largest value that avoid fragmentation, and fragmentation
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+ is just not reliable on the modern internet, especially
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+ for IPv6. It's still possible to override this with
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+ --edns-packet-max for special circumstances.
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+
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version 2.88
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Fix bug in --dynamic-host when an interface has /16 IPv4
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address. Thanks to Mark Dietzer for spotting this.
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--- man/dnsmasq.8.orig
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+++ man/dnsmasq.8
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@@ -183,7 +183,8 @@ to zero completely disables DNS function
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.TP
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.B \-P, --edns-packet-max=<size>
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Specify the largest EDNS.0 UDP packet which is supported by the DNS
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-forwarder. Defaults to 4096, which is the RFC5625-recommended size.
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+forwarder. Defaults to 1232, which is the recommended size following the
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+DNS flag day in 2020. Only increase if you know what you are doing.
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.TP
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.B \-Q, --query-port=<query_port>
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Send outbound DNS queries from, and listen for their replies on, the
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--- src/config.h.orig
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+++ src/config.h
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@@ -19,7 +19,7 @@
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#define CHILD_LIFETIME 150 /* secs 'till terminated (RFC1035 suggests > 120s) */
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#define TCP_MAX_QUERIES 100 /* Maximum number of queries per incoming TCP connection */
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#define TCP_BACKLOG 32 /* kernel backlog limit for TCP connections */
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-#define EDNS_PKTSZ 4096 /* default max EDNS.0 UDP packet from RFC5625 */
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+#define EDNS_PKTSZ 1232 /* default max EDNS.0 UDP packet from from /dnsflagday.net/2020 */
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#define SAFE_PKTSZ 1232 /* "go anywhere" UDP packet size, see https://dnsflagday.net/2020/ */
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#define KEYBLOCK_LEN 40 /* choose to minimise fragmentation when storing DNSSEC keys */
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#define DNSSEC_WORK 50 /* Max number of queries to validate one question */
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