diff --git a/salt-pillar/lxc-containers/server1.sls b/salt-pillar/lxc-containers/server1.sls
index 5a68c6c..c110797 100644
--- a/salt-pillar/lxc-containers/server1.sls
+++ b/salt-pillar/lxc-containers/server1.sls
@@ -37,6 +37,8 @@ containers:
         type: veth
       up1:
         type: phys
+        # Change (eg. auto-generation) requires reboot of the cable modem
+        hwaddr: 00:23:74:D7:2D:7C
 
   upstream2:
     interfaces:
diff --git a/salt/lxc-containers/config b/salt/lxc-containers/config
index a145be2..36e1a49 100644
--- a/salt/lxc-containers/config
+++ b/salt/lxc-containers/config
@@ -14,7 +14,11 @@ lxc.kmsg = 0
 {%- for net, conf in container['interfaces'].items() %}
 lxc.network.type={{ conf['type'] }}
 lxc.network.flags=up
+{%-   if conf.get('hwaddr') %}
+lxc.network.hwaddr={{ conf['hwaddr'] }}
+{%-   else %}
 lxc.network.hwaddr={{ hwaddr_prefix }}:{{ n.__str__().rjust(2, '0') }}
+{%-   endif %}
 {%- if conf['type'] == 'veth' %}
 lxc.network.veth.pair={{ id }}-{{ net }}
 {%- endif %}