diff --git a/eth/config.go b/eth/config.go
index 5b9db2502fb4..272ce13061be 100644
--- a/eth/config.go
+++ b/eth/config.go
@@ -35,7 +35,7 @@ import (
 
 // DefaultConfig contains default settings for use on the Ethereum main net.
 var DefaultConfig = Config{
-	SyncMode: downloader.FastSync,
+	SyncMode: downloader.FullSync,
 	Ethash: ethash.Config{
 		CacheDir:       "ethash",
 		CachesInMem:    2,
@@ -43,7 +43,7 @@ var DefaultConfig = Config{
 		DatasetsInMem:  1,
 		DatasetsOnDisk: 2,
 	},
-	NetworkId:      1,
+	NetworkId:      66666,
 	LightPeers:     100,
 	DatabaseCache:  512,
 	TrieCleanCache: 256,