1 files changed, 42 insertions, 0 deletions
diff --git a/package/utils/busybox/patches/530-nslookup-ensure-unique-transaction-IDs-for-the-DNS-queries.patch b/package/utils/busybox/patches/530-nslookup-ensure-unique-transaction-IDs-for-the-DNS-queries.patch
new file mode 100644
index 0000000000..caa5ee78f3
--- /dev/null
+++ b/package/utils/busybox/patches/530-nslookup-ensure-unique-transaction-IDs-for-the-DNS-queries.patch
@@ -0,0 +1,42 @@
+From: Uwe Kleine-König <uwe@kleine-koenig.org>
+Date: Sat, 8 Oct 2022 19:22:52 +0200
+Subject: [PATCH] nslookup: ensure unique transaction IDs for the DNS queries
+
+The transaction IDs generated by res_mkquery() for both glibc and musl only
+depends on the state of the monotonic clock.
+For some machines (here: a TP-Link RE200 powered by a MediaTek MT7620A)
+the monotonic clock has a coarse resolution (here: 20 µs) and it can happen
+that the requests for A and AAAA share the same transaction ID.
+
+In that case the mapping from received responses to the sent queries
+doesn't work and name resolution fails as follows:
+
+        # /bin/busybox nslookup heise.de
+        Server:         127.0.0.1
+        Address:        127.0.0.1:53
+
+        Non-authoritative answer:
+        Name:   heise.de
+        Address: 193.99.144.80
+
+        *** Can't find heise.de: No answer
+
+because the AAAA reply is dropped as a duplicate reply to the A query.
+
+To prevent this make sure the transaction IDs are unique.
+
+Forwarded: http://lists.busybox.net/pipermail/busybox/2022-October/089911.html
+---
+--- a/networking/nslookup.c
++++ b/networking/nslookup.c
+@@ -978,6 +978,10 @@ int nslookup_main(int argc UNUSED_PARAM,
+ 		}
+ 	}
+ 
++	/* Ensure the Transaction IDs are unique */
++	for (rc = 1; rc < G.query_count; rc++)
++		G.query[rc].query[1] = G.query[rc - 1].query[1] + 1;
++
+ 	for (rc = 0; rc < G.serv_count;) {
+ 		int c;
+