3 files changed, 5 insertions, 2 deletions
diff --git a/src/lib/connections/bridge b/src/lib/connections/bridge
index b358e01..1b25f2b 100644
--- a/src/lib/connections/bridge
+++ b/src/lib/connections/bridge
@@ -29,7 +29,7 @@ bridge_up() {
 
 bridge_down() {
     for member in "${BindsToInterfaces[@]}"; do
-        ip link set "$member" promisc off down
+        ip link set dev "$member" promisc off down
         ip link set dev "$member" nomaster
     done
 
diff --git a/src/lib/connections/vlan b/src/lib/connections/vlan
index b34a67e..037c971 100644
--- a/src/lib/connections/vlan
+++ b/src/lib/connections/vlan
@@ -10,6 +10,9 @@ vlan_up() {
     if is_interface "$Interface"; then
         report_error "Interface '$Interface' already exists"
         return 1
+    elif [[ $VLANID != +([[:digit:]]) ]]; then
+        report_error "Invalid VLAN identifier: '$VLANID'"
+        return 1
     else
         bring_interface_up "$BindsToInterfaces"
         interface_add vlan "$Interface" "$BindsToInterfaces" id "$VLANID"
diff --git a/src/lib/network b/src/lib/network
index b91b5e8..a875101 100755
--- a/src/lib/network
+++ b/src/lib/network
@@ -18,7 +18,7 @@ is_interface() {
 interface_add() {
     local type="$1" name="$2" link="$3"
     shift 3
-    ip link add ${link:+link "$link"} name "$name" type "$type" "$@"
+    ip link add ${link:+link "$link"} name "$name" type "$type" "$@" || return
     if [[ -x "$PROFILE_DIR/interfaces/$name" ]]; then
         source "$PROFILE_DIR/interfaces/$name"
     fi