diff --git a/src/router/mod.rs b/src/router/mod.rs
index 18b3836..5ac1082 100644
--- a/src/router/mod.rs
+++ b/src/router/mod.rs
@@ -1,4 +1,4 @@
-use anyhow::Result;
+use anyhow::{ensure, Result};
 use lnvps_db::{Vm, VmIpAssignment};
 use rocket::async_trait;
 
@@ -30,6 +30,7 @@ pub struct ArpEntry {
 
 impl ArpEntry {
     pub fn new(vm: &Vm, ip: &VmIpAssignment, interface: Option<String>) -> Result<Self> {
+        ensure!(vm.mac_address != "ff:ff:ff:ff:ff:ff", "MAC address is invalid because its blank");
         Ok(Self {
             id: ip.arp_ref.clone(),
             address: ip.ip.clone(),
@@ -47,4 +48,3 @@ mod ovh;
 #[cfg(feature = "mikrotik")]
 pub use mikrotik::MikrotikRouter;
 pub use ovh::OvhDedicatedServerVMacRouter;
-