diff --git a/usr/local/bin/bastille b/usr/local/bin/bastille
index 032d17e8..0542bed8 100755
--- a/usr/local/bin/bastille
+++ b/usr/local/bin/bastille
@@ -54,6 +54,9 @@ bastille_conf_check
 
 ## we only load the config if conf_check passes
 . /usr/local/etc/bastille/bastille.conf
+# Set default values for config properties added during the current major version:
+: "${bastille_network_pf_ext_if:=ext_if}"
+: "${bastille_network_pf_table:=jails}"
 
 ## bastille_prefix should be 0750
 ## this restricts file system access to privileged users
diff --git a/usr/local/etc/bastille/bastille.conf.sample b/usr/local/etc/bastille/bastille.conf.sample
index 2c4688a8..4e812e7f 100644
--- a/usr/local/etc/bastille/bastille.conf.sample
+++ b/usr/local/etc/bastille/bastille.conf.sample
@@ -49,6 +49,8 @@ bastille_decompress_gz_options="-k -d -c -v"                          ## default
 
 ## Networking
 bastille_network_loopback="bastille0"                                 ## default: "bastille0"
+bastille_network_pf_ext_if="ext_if"                                   ## default: "ext_if"
+bastille_network_pf_table="jails"                                     ## default: "jails"
 bastille_network_shared=""                                            ## default: ""
 bastille_network_gateway=""                                           ## default: ""
 bastille_network_gateway6=""                                          ## default: ""
diff --git a/usr/local/share/bastille/rdr.sh b/usr/local/share/bastille/rdr.sh
index ee0514d5..a7e59c2e 100644
--- a/usr/local/share/bastille/rdr.sh
+++ b/usr/local/share/bastille/rdr.sh
@@ -78,9 +78,9 @@ check_jail_validity() {
     fi
 
     # Check if ext_if is defined in pf.conf
-    EXT_IF=$(grep '^[[:space:]]*ext_if[[:space:]]*=' /etc/pf.conf)
+    EXT_IF=$(grep "^[[:space:]]*${bastille_network_pf_ext_if}[[:space:]]*=" /etc/pf.conf)
     if [ -z "${EXT_IF}" ]; then
-        error_exit "ext_if not defined in pf.conf"
+        error_exit "bastille_network_pf_ext_if (${bastille_network_pf_ext_if}) not defined in pf.conf"
     fi
 }
 
@@ -104,7 +104,7 @@ fi
 # function: load rdr rule via pfctl
 load_rdr_rule() {
 ( pfctl -a "rdr/${JAIL_NAME}" -Psn;
-  printf '%s\nrdr pass on $ext_if inet proto %s to port %s -> %s port %s\n' "$EXT_IF" "$1" "$2" "$JAIL_IP" "$3" ) \
+  printf '%s\nrdr pass on $%s inet proto %s to port %s -> %s port %s\n' "$EXT_IF" "${bastille_network_pf_ext_if}" "$1" "$2" "$JAIL_IP" "$3" ) \
       | pfctl -a "rdr/${JAIL_NAME}" -f-
 }
 
@@ -114,7 +114,7 @@ proto=$1;host_port=$2;jail_port=$3;
 shift 3;
 log=$@
 ( pfctl -a "rdr/${JAIL_NAME}" -Psn;
-  printf '%s\nrdr pass %s on $ext_if inet proto %s to port %s -> %s port %s\n' "$EXT_IF" "$log" "$proto" "$host_port" "$JAIL_IP" "$jail_port" ) \
+  printf '%s\nrdr pass %s on $%s inet proto %s to port %s -> %s port %s\n' "$EXT_IF" "$log" "${bastille_network_pf_ext_if}" "$proto" "$host_port" "$JAIL_IP" "$jail_port" ) \
       | pfctl -a "rdr/${JAIL_NAME}" -f-
 }
 
diff --git a/usr/local/share/bastille/start.sh b/usr/local/share/bastille/start.sh
index e08af945..45110be4 100644
--- a/usr/local/share/bastille/start.sh
+++ b/usr/local/share/bastille/start.sh
@@ -83,8 +83,8 @@ for _jail in ${JAILS}; do
                 error_notify "Error: IP address (${ip}) already in use."
                 continue
             fi
-            ## add ip4.addr to firewall table:jails
-            pfctl -q -t jails -T add "${ip}"
+            ## add ip4.addr to firewall table
+            pfctl -q -t "${bastille_network_pf_table}" -T add "${ip}"
         fi
 
         ## start the container
diff --git a/usr/local/share/bastille/stop.sh b/usr/local/share/bastille/stop.sh
index 5d4911b8..5343d77d 100644
--- a/usr/local/share/bastille/stop.sh
+++ b/usr/local/share/bastille/stop.sh
@@ -70,10 +70,10 @@ for _jail in ${JAILS}; do
         info "[${_jail}]:"
         jail -f "${bastille_jailsdir}/${_jail}/jail.conf" -r "${_jail}"
 
-        ## remove (captured above) ip4.addr from firewall table:jails
+        ## remove (captured above) ip4.addr from firewall table
         if [ -n "${bastille_network_loopback}" -a ! -z "${_ip}" ]; then
             if grep -qw "interface.*=.*${bastille_network_loopback}" "${bastille_jailsdir}/${_jail}/jail.conf"; then
-                pfctl -q -t jails -T delete "${_ip}"
+                pfctl -q -t "${bastille_network_pf_table}" -T delete "${_ip}"
             fi
         fi
     fi