diff --git a/src/network.sh b/src/network.sh
index 030d902..4705bcc 100644
--- a/src/network.sh
+++ b/src/network.sh
@@ -142,8 +142,8 @@ maskToCIDR() {
     }
   ')
 
-  if [[ ! "$prefix" =~ ^[0-9]+$ ]] || (( prefix < 1 || prefix > 24 )); then
-    error "Invalid MASK: '$mask' (supported range: /1 through /24)"
+  if [[ ! "$prefix" =~ ^[0-9]+$ ]] || (( prefix < 0 || prefix > 32 )); then
+    error "Invalid MASK: '$mask'"
     return 1
   fi
 
@@ -1372,6 +1372,11 @@ validateMask() {
 
   PREFIX=$(maskToCIDR "$MASK") || exit 28
 
+  if (( PREFIX < 1 || PREFIX > 24 )); then
+    error "Unsupported MASK: '$MASK' (supported range: /1 through /24)"
+    exit 28
+  fi
+
   return 0
 }
 
diff --git a/src/reset.sh b/src/reset.sh
index 0fabcf7..3761561 100644
--- a/src/reset.sh
+++ b/src/reset.sh
@@ -31,6 +31,8 @@ detectEngine() {
     else
       [ -z "$ENGINE" ] && ENGINE="Kubernetes"
     fi
+  elif [ -f "/.dockerenv" ]; then
+    ENGINE="Docker"
   fi
 
   return 0