diff --git a/app/nginx-1.11.10/conf/f-stack.conf b/app/nginx-1.11.10/conf/f-stack.conf
index 15163164..38b6d078 100644
--- a/app/nginx-1.11.10/conf/f-stack.conf
+++ b/app/nginx-1.11.10/conf/f-stack.conf
@@ -19,20 +19,20 @@ vlan_strip=1
 #    num      ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
 #
 # examples
-#    1-3       ports 1,2,3 are enabled
+#    0-3       ports 0, 1,2,3 are enabled
 #    1-3,4,7   ports 1,2,3,4,7 are enabled
 port_list=0
 
 ## Port config section
-## According to dpdk.nb_ports: port0, port1...
+## Correspond to dpdk.port_list's index: port0, port1...
 [port0]
 addr=192.168.1.2
 netmask=255.255.255.0
 broadcast=192.168.1.255
 gateway=192.168.1.1
-# lcore list used to handle this port
-# the format is same as port_list
 
+## lcore list used to handle this port
+## the format is same as port_list
 # lcore_list= 0
 
 ## Packet capture path, this will hurt performance
@@ -45,6 +45,7 @@ gateway=192.168.1.1
 #[kni]
 #enable=1
 #method=reject
+## The format is same as port_list
 #tcp_port=80,443
 #udp_port=53
 
@@ -69,6 +70,8 @@ net.inet.tcp.tcbhashsize=65536
 kern.ipc.somaxconn=32768
 kern.ipc.maxsockbuf=16777216
 
+net.link.ether.inet.maxhold=5
+
 net.inet.tcp.fast_finwait2_recycle=1
 net.inet.tcp.sendspace=16384
 net.inet.tcp.recvspace=8192
diff --git a/config.ini b/config.ini
index 85427b1c..38b6d078 100644
--- a/config.ini
+++ b/config.ini
@@ -19,20 +19,20 @@ vlan_strip=1
 #    num      ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
 #
 # examples
-#    1-3       ports 1,2,3 are enabled
+#    0-3       ports 0, 1,2,3 are enabled
 #    1-3,4,7   ports 1,2,3,4,7 are enabled
 port_list=0
 
 ## Port config section
-## According to dpdk.nb_ports: port0, port1...
+## Correspond to dpdk.port_list's index: port0, port1...
 [port0]
 addr=192.168.1.2
 netmask=255.255.255.0
 broadcast=192.168.1.255
 gateway=192.168.1.1
-# lcore list used to handle this port
-# the format is same as port_list
 
+## lcore list used to handle this port
+## the format is same as port_list
 # lcore_list= 0
 
 ## Packet capture path, this will hurt performance
@@ -45,6 +45,7 @@ gateway=192.168.1.1
 #[kni]
 #enable=1
 #method=reject
+## The format is same as port_list
 #tcp_port=80,443
 #udp_port=53