give route only for v6

files/ppp-post-scripts/postdown.sh.j2

@@ -14,3 +14,5 @@ ip rule del pref 100 fwmark $INIT_ID lookup $INIT_ID
 ip -6 rule del pref 100 fwmark $INIT_ID lookup $INIT_ID
 
 ppp_origin -D "$PPP_IFACE"
+
+true

files/ppp-post-scripts/postup.sh.j2

@@ -12,9 +12,13 @@ iptables -t nat -o "$PPP_IFACE" -A POSTROUTING -j MASQUERADE
 
 ip route add default dev "$PPP_IFACE" table $INIT_ID
 ip route add default dev "$PPP_IFACE" metric $INIT_ID
-ip -6 route add default dev "$PPP_IFACE" table $INIT_ID
-ip -6 route add default dev "$PPP_IFACE" metric $INIT_ID
 ip rule add pref 100 fwmark $INIT_ID lookup $INIT_ID
-ip -6 rule add pref 100 fwmark $INIT_ID lookup $INIT_ID
+
+ip -6 addr show dev "$PPP_IFACE" | grep "inet6"
+if [[ "$?" == 0 ]]; then
+  ip -6 route add default dev "$PPP_IFACE" table $INIT_ID
+  ip -6 route add default dev "$PPP_IFACE" metric $INIT_ID
+  ip -6 rule add pref 100 fwmark $INIT_ID lookup $INIT_ID
+fi
 
 ppp_origin -A "$PPP_IFACE"