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From 927121fa9afe047009a2502491d1c7000871b45c Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 25 Oct 2023 19:28:50 -0400
Subject: [PATCH] dnscache.8,tinydns.8: document TRUNCATELEN hack for microtiks
---
dnscache.8 | 9 +++++++++
tinydns.8 | 9 +++++++++
2 files changed, 18 insertions(+)
diff --git a/dnscache.8 b/dnscache.8
index 54fd357..38dab27 100644
--- a/man/dnscache.8
+++ b/man/dnscache.8
@@ -116,6 +116,15 @@ for other caches, not root servers.
It forwards queries to those caches the same way that a client does,
rather than contacting a chain of servers according to NS records.
+.B dnscache
+will use the value of
+.I $TRUNCATELEN
+as the cut-off for a UDP response. The standard value according to the
+RFC is 512 (bytes), but
+.I $TRUNCATELEN
+can be anywhere between 512 and 16384. This may be necessary to work
+around implementation bugs.
+
.SH Memory use
.B dnscache
diff --git a/tinydns.8 b/tinydns.8
index ff92edd..bc991dd 100644
--- a/man/tinydns.8
+++ b/man/tinydns.8
@@ -47,6 +47,15 @@ as specified by
a binary file created by
.BR tinydns-data (8).
+.B tinydns
+will use the value of
+.I $TRUNCATELEN
+as the cut-off for a UDP response. The standard value according to the
+RFC is 512 (bytes), but
+.I $TRUNCATELEN
+can be anywhere between 512 and 16384. This may be necessary to work
+around implementation bugs.
+
.SH Further details
.B tinydns
--
2.41.0
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