diff --git a/scripts/mkjail.sh b/scripts/mkjail.sh
index 2f76e14..8942a6f 100755
--- a/scripts/mkjail.sh
+++ b/scripts/mkjail.sh
@@ -1,5 +1,7 @@
 #!/bin/sh
 
+set -e
+
 if [ -f "/usr/local/etc/reggae.conf" ]; then
   . "/usr/local/etc/reggae.conf"
 fi
@@ -173,9 +175,8 @@ EOF
     -e "s;MAC;${MAC};g" \
     "${SCRIPT_DIR}/../templates/base-jail.conf" >>"/etc/jail.conf.d/${NAME}.conf"
   echo -e "${OPTIONS}\n}" >>"/etc/jail.conf.d/${NAME}.conf"
-  sysrc -R "${BSDINSTALL_CHROOT}" ifconfig_eth0="ether ${MAC}"
   if [ "${USE_IPV4}" = "yes" ]; then
-    sysrc -R "${BSDINSTALL_CHROOT}" ifconfig_eth0+="DHCP"
+    sysrc -R "${BSDINSTALL_CHROOT}" ifconfig_eth0="DHCP"
   fi
   if [ "${USE_IPV6}" = "yes" ]; then
     sysrc -R "${BSDINSTALL_CHROOT}" ifconfig_eth0_ipv6="inet6 -ifdisabled accept_rtadv auto_linklocal"
diff --git a/templates/base-jail.conf b/templates/base-jail.conf
index fe510bb..8797c62 100644
--- a/templates/base-jail.conf
+++ b/templates/base-jail.conf
@@ -6,17 +6,17 @@
   mount.devfs;
   host.domainname = "HOST";
   host.hostname = "${name}.${host.domainname}";
-  vnet.interface = "epair${id}a";
-  $host_interface = "epair${id}b";
+  $host_interface = "epair${id}a";
+  vnet.interface = "epair${id}b";
   devfs_ruleset = 8;
   allow.raw_sockets;
 
   exec.clean;
-  exec.prepare = "ifconfig ${vnet.interface} && ifconfig ${host_interface} destroy || true";
-  exec.prestart  = "ifconfig epair${id} create ether ${mac} group $(echo ${name} | cut -b 1-15) up || (ifconfig ${vnet.interface} destroy && false)";
-  exec.prestart += "ifconfig ${host_interface} up";
+  exec.prepare = "ifconfig ${host_interface} && ifconfig ${host_interface} destroy || true";
+  exec.prestart  = "ifconfig epair${id} create group $(echo ${name} | cut -b 1-15) up || (ifconfig ${host_interface} destroy && false)";
   exec.prestart += "ifconfig jails addm ${host_interface}";
   exec.start  = "ifconfig ${vnet.interface} name eth0";
+  exec.start += "ifconfig eth0 ether ${mac}";
   exec.start += "service dhclient start eth0";
   exec.start += "/bin/sh /etc/rc";
   exec.stop = "/bin/sh /etc/rc.shutdown";