From 21cf6cd12825e8657935ef82fdd6910e04340672 Mon Sep 17 00:00:00 2001
From: gVisor bot <gvisor-bot@google.com>
Date: Thu, 20 Jun 2019 15:50:01 +0800
Subject: [PATCH] Chore: use 'dns' for ALPN in tcp-tls nameserver (#209)

---
 dns/client.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dns/client.go b/dns/client.go
index 862d935d..4af716bd 100644
--- a/dns/client.go
+++ b/dns/client.go
@@ -240,6 +240,8 @@ func transform(servers []NameServer) []*nameserver {
 				Net: s.Net,
 				TLSConfig: &tls.Config{
 					ClientSessionCache: globalSessionCache,
+					// alpn identifier, see https://tools.ietf.org/html/draft-hoffman-dprive-dns-tls-alpn-00#page-6
+					NextProtos: []string{"dns"},
 				},
 				UDPSize: 4096,
 			},