diff --git a/nix/os/devices/fwhost1/system.nix b/nix/os/devices/fwhost1/system.nix
index 66fefb3..eb78072 100644
--- a/nix/os/devices/fwhost1/system.nix
+++ b/nix/os/devices/fwhost1/system.nix
@@ -23,6 +23,7 @@ in {
   networking.usePredictableInterfaceNames = false;
 
   networking.bridges.breth.interfaces = [ "eth0" "eth1" ];
+  networking.bridges.breth.rstp = true;
 
   networking.defaultGateway.address = "172.172.171.10";
   networking.nameservers = [ "172.172.171.10" ];
diff --git a/nix/os/devices/fwhost2/system.nix b/nix/os/devices/fwhost2/system.nix
index 2554220..f6a60b7 100644
--- a/nix/os/devices/fwhost2/system.nix
+++ b/nix/os/devices/fwhost2/system.nix
@@ -24,6 +24,7 @@ in {
   networking.usePredictableInterfaceNames = false;
 
   networking.bridges.breth.interfaces = [ "eth0" "eth1" ];
+  networking.bridges.breth.rstp = true;
 
   networking.defaultGateway.address = "172.172.171.10";
   networking.nameservers = [ "172.172.171.10" ];