diff --git a/libraries/ESP8266WiFi/examples/IPv6/IPv6.ino b/libraries/ESP8266WiFi/examples/IPv6/IPv6.ino
index be9a3a28ed..1257fb778f 100644
--- a/libraries/ESP8266WiFi/examples/IPv6/IPv6.ino
+++ b/libraries/ESP8266WiFi/examples/IPv6/IPv6.ino
@@ -54,8 +54,6 @@ void status(Print& out) {
   out.println(F("------------------------------"));
   out.println(ESP.getFullVersion());
 
-  dns_setserver(DNS_MAX_SERVERS - 1, IPAddress(8, 8, 8, 8));
-
   for (int i = 0; i < DNS_MAX_SERVERS; i++) {
     IPAddress dns = WiFi.dnsIP(i);
     if (dns.isSet()) {
diff --git a/tools/sdk/lib/liblwip6-1460-feat.a b/tools/sdk/lib/liblwip6-1460-feat.a
index 9941317b92..1300c13fa9 100644
Binary files a/tools/sdk/lib/liblwip6-1460-feat.a and b/tools/sdk/lib/liblwip6-1460-feat.a differ
diff --git a/tools/sdk/lib/liblwip6-536-feat.a b/tools/sdk/lib/liblwip6-536-feat.a
index 7173f188b2..c24a7d4190 100644
Binary files a/tools/sdk/lib/liblwip6-536-feat.a and b/tools/sdk/lib/liblwip6-536-feat.a differ
diff --git a/tools/sdk/lwip2/builder b/tools/sdk/lwip2/builder
index 51b2d6ceec..4670dfc00f 160000
--- a/tools/sdk/lwip2/builder
+++ b/tools/sdk/lwip2/builder
@@ -1 +1 @@
-Subproject commit 51b2d6ceec717e06dc6ef0c839bb1e23809193be
+Subproject commit 4670dfc00f0ce2caf194aca2f497d89d7b758ac7
diff --git a/tools/sdk/lwip2/include/lwip-git-hash.h b/tools/sdk/lwip2/include/lwip-git-hash.h
index 70bbead2f4..3d82ef7104 100644
--- a/tools/sdk/lwip2/include/lwip-git-hash.h
+++ b/tools/sdk/lwip2/include/lwip-git-hash.h
@@ -1,5 +1,5 @@
 // generated by makefiles/make-lwip2-hash
 #ifndef LWIP_HASH_H
 #define LWIP_HASH_H
-#define LWIP_HASH_STR "STABLE-2_1_2_RELEASE/glue:1.0-5-g51b2d6c"
+#define LWIP_HASH_STR "STABLE-2_1_2_RELEASE/glue:1.0-6-g4670dfc"
 #endif // LWIP_HASH_H