Update default-settings

devices/common/default-settings

@@ -89,6 +89,7 @@ test $version -lt 1 && {
 	uci set dhcp.dnsmasq[0].allservers='1'
 	uci set dhcp.lan.force='1'
 	uci set dhcp.@dnsmasq[0].cachesize='1500'
+	uci set dhcp.@dnsmasq[0].min_ttl='3600'
 	uci set dhcp.lan.ra='hybrid'
 	uci set dhcp.lan.ndp='hybrid'
 	uci set dhcp.lan.dhcpv6='hybrid'