diff --git a/luci-app-openmptcprouter/luasrc/controller/openmptcprouter.lua b/luci-app-openmptcprouter/luasrc/controller/openmptcprouter.lua
index be6010752..c2c836966 100644
--- a/luci-app-openmptcprouter/luasrc/controller/openmptcprouter.lua
+++ b/luci-app-openmptcprouter/luasrc/controller/openmptcprouter.lua
@@ -37,7 +37,7 @@ function wizard_add()
 	local add_server = luci.http.formvalue("add_server") or ""
 	local add_server_name = luci.http.formvalue("add_server_name") or ""
 	if add_server ~= "" and add_server_name ~= "" then
-		ucic:set("openmptcprouter",add_server_name,"server")
+		ucic:set("openmptcprouter",add_server_name:gsub("[^%w_]+","_"),"server")
 		gostatus = false
 	end
 
@@ -404,6 +404,7 @@ function wizard_add()
 	local shadowsocks_disable = luci.http.formvalue("disableshadowsocks") or "0"
 	ucic:set("openmptcprouter","settings","shadowsocks_disable",shadowsocks_disable)
 	ucic:set("openmptcprouter","settings","vpn",default_vpn)
+	ucic:delete("openmptcprouter","settings","master_lcintf")
 	ucic:save("openmptcprouter")
 	ucic:commit("openmptcprouter")
 
diff --git a/luci-app-openmptcprouter/luasrc/view/openmptcprouter/settings.htm b/luci-app-openmptcprouter/luasrc/view/openmptcprouter/settings.htm
index 93593b6ac..000e14287 100644
--- a/luci-app-openmptcprouter/luasrc/view/openmptcprouter/settings.htm
+++ b/luci-app-openmptcprouter/luasrc/view/openmptcprouter/settings.htm
@@ -71,13 +71,13 @@
 		</div>
 	    </div>
 	    <div class="cbi-value">
-		<label class="cbi-value-title"><%:Dynamic master interface%></label>
+		<label class="cbi-value-title"><%:Master interface selection%></label>
 		<div class="cbi-value-field">
-		    <input type="checkbox" name="master_type" class="cbi-input-checkbox" value="dynamic" <% if luci.model.uci.cursor():get("openmptcprouter","settings","master") == "dynamic" then %>checked<% end %>>
-		    <br />
-		    <div class="cbi-value-description">
-		        <%:Connection with lowest RTT is used as master interface%>
-		    </div>
+		    <select class="cbi-input-select" name="master_type">
+			<option value="change" <% if luci.model.uci.cursor():get("openmptcprouter","settings","master") == "change" then %>selected="selected"<% end %>><%:On wizard change%></option>
+			<option value="dynamic" <% if luci.model.uci.cursor():get("openmptcprouter","settings","master") == "dynamic" then %>selected="selected"<% end %>><%:Dynamic change%></option>
+			<option value="static" <% if luci.model.uci.cursor():get("openmptcprouter","settings","master") == "static" then %>selected="selected"<% end %>><%:No change%></option>
+		    </select>
 		</div>
 	    </div>
 	</fieldset>
diff --git a/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm b/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm
index 84da87033..78818b472 100644
--- a/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm
+++ b/luci-app-openmptcprouter/luasrc/view/openmptcprouter/wizard.htm
@@ -99,7 +99,7 @@ end
 	    %>
 		<div class="cbi-section-create">
 		    <div>
-			<input type="text" class="cbi-section-create-name" id="cbi.cts.omr-bypass.server." name="add_server_name" data-type="uciname" data-optional="true" />
+			<input type="text" class="cbi-section-create-name" id="cbi.cts.omr-bypass.server." name="add_server_name" data-type="uciname" data-optional="false" />
 		    </div>
 		    <input class="cbi-button cbi-button-add" type="submit" onclick="this.form.cbi_state='add-section'; return true" name="add_server" value="<%:Add server%>" />
 		</div>
diff --git a/luci-app-openmptcprouter/root/etc/uci-defaults/openmptcprouter b/luci-app-openmptcprouter/root/etc/uci-defaults/openmptcprouter
index dcd2daca8..13a779ea5 100755
--- a/luci-app-openmptcprouter/root/etc/uci-defaults/openmptcprouter
+++ b/luci-app-openmptcprouter/root/etc/uci-defaults/openmptcprouter
@@ -36,7 +36,7 @@ fi
 if [ "$(uci -q get openmptcprouter.settings.master)" = "" ]; then
 	uci -q batch <<-EOF
 		set openmptcprouter.settings=settings
-		set openmptcprouter.settings.master='dynamic'
+		set openmptcprouter.settings.master='change'
 		commit openmptcprouter
 	EOF
 fi
diff --git a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
index df98d2b85..2c095baff 100755
--- a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
+++ b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
@@ -352,12 +352,13 @@ fi
 
 [ -n "$OMR_TRACKER_LATENCY" ] && {
 	uci -q set openmptcprouter.$OMR_TRACKER_INTERFACE.latency="$OMR_TRACKER_LATENCY"
-	if [ "$multipath_config" = "on" ] && [ "$(uci -q get network.$OMR_TRACKER_INTERFACE.multipath)" != "master" ] && [ "$(uci -q get openmptcprouter.settings.master)" = "dynamic" ]; then
+	if [ "$multipath_config" = "on" ] && [ "$(uci -q get network.$OMR_TRACKER_INTERFACE.multipath)" != "master" ] && ([ "$(uci -q get openmptcprouter.settings.master)" = "dynamic" ] || ([ "$(uci -q get openmptcprouter.settings.master)" = "change" ] && [ "$(uci -q get openmptcprouter.settings.master_lcintf | grep $OMR_TRACKER_INTERFACE)" = "" ])); then
 		masterintf="$(uci -q show network | grep multipath=\'master\' | cut -d'.' -f2)"
 		masterlatency="$(uci -q get openmptcprouter.$masterintf.latency | tr -d '\n')"
-		if [ -n "$masterintf" ] && [ "$masterlatency" != "" ] && [ "$OMR_TRACKER_LATENCY" -lt "$(($masterlatency/2))" ]; then
+		if [ -n "$masterintf" ] && [ "$masterlatency" != "" ] && [ "$OMR_TRACKER_LATENCY" -lt "$((masterlatency/2))" ]; then
 			uci -q set network.$masterintf.multipath='on'
 			uci -q set network.$OMR_TRACKER_INTERFACE.multipath='master'
+			uci -q add_list openmptcprouter.settings.master_lcintf="$OMR_TRACKER_INTERFACE"
 			_log "Change master interface from $masterintf ($masterlatency ms) to $OMR_TRACKER_INTERFACE ($OMR_TRACKER_LATENCY ms)"
 		fi
 	fi