Merge "Increase the maximum exponential backoff for DNS64 queries."android-o-mr1-iot-preview-6o-mr1-iot-preview-6

am: e477c86203

Change-Id: I41f54d6b15bb958bb68f6bcdbb0fe63c20836a30

1 files changed, 5 insertions, 2 deletions

diff --git a/config.c b/config.c
index b147868..2d7085b 100644
--- a/config.c
+++ b/config.c
@@ -180,8 +180,11 @@ void dns64_detection(unsigned net_id) {
     logmsg(ANDROID_LOG_WARN, "dns64_detection -- error, sleeping for %d seconds", backoff_sleep);
     sleep(backoff_sleep);
     backoff_sleep *= 2;
-    if(backoff_sleep >= 120) {
-      backoff_sleep = 120;
+    if(backoff_sleep >= 1800) {
+      // Scale down to one DNS query per half hour. Unnecessary DNS queries waste power, and the
+      // benefit is minimal (basically, only limited to the case where a network goes from IPv6-only
+      // to IPv6 with NAT64).
+      backoff_sleep = 1800;
     }
   }
 }