diff --git a/Dockerfile b/Dockerfile
index f0e665b..5373901 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,7 @@ COPY frontend/ /app
 RUN cd /app && npm install && npm run build
 
 FROM golang:1.17.3-buster AS backend-builder
+RUN go env -w GOPROXY=https://goproxy.cn
 RUN go install github.com/gobuffalo/packr/v2/packr2@latest
 COPY --from=frontend-builder /app/static /app/frontend/static
 COPY . /app
diff --git a/install-deps-arm.sh b/install-deps-arm.sh
index 69994c7..3f239a3 100755
--- a/install-deps-arm.sh
+++ b/install-deps-arm.sh
@@ -9,4 +9,5 @@ apt-get install -y nodejs
 
 PATH=$PATH:~/go/bin
 
+go env -w GOPROXY=https://goproxy.cn
 go install github.com/gobuffalo/packr/v2/packr2@latest
diff --git a/install-deps.sh b/install-deps.sh
index 80f0287..a5fa2ba 100755
--- a/install-deps.sh
+++ b/install-deps.sh
@@ -9,4 +9,5 @@ apt-get install -y nodejs
 
 PATH=$PATH:~/go/bin
 
+go env -w GOPROXY=https://goproxy.cn
 go install github.com/gobuffalo/packr/v2/packr2@latest
diff --git a/main.go b/main.go
index bc4a72c..f8ab3a6 100644
--- a/main.go
+++ b/main.go
@@ -52,7 +52,7 @@ var (
 	masterBasicAuthPassword  = kingpin.Flag("master.basic-auth.password", "password for master server's Basic Auth").Default("").Envar("OVPN_MASTER_PASSWORD").String()
 	masterSyncFrequency      = kingpin.Flag("master.sync-frequency", "master host data sync frequency in seconds").Default("600").Envar("OVPN_MASTER_SYNC_FREQUENCY").Int()
 	masterSyncToken          = kingpin.Flag("master.sync-token", "master host data sync security token").Default("VerySecureToken").Envar("OVPN_MASTER_TOKEN").PlaceHolder("TOKEN").String()
-	openvpnNetwork           = kingpin.Flag("ovpn.network", "NETWORK/MASK_PREFIX for OpenVPN server").Default("172.16.100.0/24").Envar("OVPN_NETWORK").String()
+	openvpnNetwork           = kingpin.Flag("ovpn.network", "NETWORK/MASK_PREFIX for OpenVPN server").Default("192.168.100.0/24").Envar("OVPN_NETWORK").String()
 	openvpnServer            = kingpin.Flag("ovpn.server", "HOST:PORT:PROTOCOL for OpenVPN server; can have multiple values").Default("127.0.0.1:7777:tcp").Envar("OVPN_SERVER").PlaceHolder("HOST:PORT:PROTOCOL").Strings()
 	openvpnServerBehindLB    = kingpin.Flag("ovpn.server.behindLB", "enable if your OpenVPN server is behind Kubernetes Service having the LoadBalancer type").Default("false").Envar("OVPN_LB").Bool()
 	openvpnServiceName       = kingpin.Flag("ovpn.service", "the name of Kubernetes Service having the LoadBalancer type if your OpenVPN server is behind it").Default("openvpn-external").Envar("OVPN_LB_SERVICE").Strings()