diff --git a/Dockerfile b/Dockerfile
index eeffa31..20a5e47 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,12 +17,13 @@ COPY --from=builder /tun2socks /usr/bin/tun2socks
 RUN apk add --update --no-cache iptables iproute2 \
     && chmod +x /entrypoint.sh
 
-ENV TUN tun0
-ENV ETH eth0
+ENV TUN=tun0
+ENV ETH=eth0
 ENV TUN_ADDR=198.18.0.1
 ENV TUN_MASK=255.254.0.0
 ENV LOGLEVEL=INFO
 ENV PROXY=direct://
+ENV MTU=9000
 ENV STATS=
 ENV TOKEN=
 ENV EXTRA_COMMANDS=
diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index f7b4a19..2926395 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -9,10 +9,15 @@ services:
         - '/dev/net/tun:/dev/net/tun'
     environment:
       - GODEBUG=madvdontneed=1
-      - LOGLEVEL=WARN
+      - LOGLEVEL=
+      - TUN=
+      - ETH=
+      - TUN_ADDR=
+      - TUN_MASK=
       - PROXY=
       - STATS=
       - TOKEN=
+      - MTU=
       - EXTRA_COMMANDS=
       - TUN_INCLUDED_ROUTES=
       - TUN_EXCLUDED_ROUTES=
diff --git a/docker/entrypoint.sh b/docker/entrypoint.sh
index 548ecf3..bd07176 100644
--- a/docker/entrypoint.sh
+++ b/docker/entrypoint.sh
@@ -43,11 +43,6 @@ config_route() {
   ip rule add from "$eth" priority 9999 table main
   ip rule add from all priority 10000 table "$TABLE"
 
-  # reserved IP addresses
-  ip rule add to 0.0.0.0/8 table main
-  ip rule add to 192.0.2.0/24 table main
-  ip rule add to 224.0.0.0/4 table main
-
   # add tun included routes
   for addr in $(echo "$TUN_INCLUDED_ROUTES" | tr ',' '\n'); do
     ip rule add to "$addr" table "$TABLE"
@@ -68,8 +63,12 @@ main() {
     sh -c "$EXTRA_COMMANDS"
   fi
 
+  if [ -n "$MTU" ]; then
+    ARGS="--mtu $MTU"
+  fi
+
   if [ -n "$STATS" ]; then
-    ARGS="--stats $STATS"
+    ARGS="$ARGS --stats $STATS"
   fi
 
   if [ -n "$TOKEN" ]; then