[Feature][ZXW-241]merge P56U01 version

Only Configure: No
Affected branch: master
Affected module: unknow
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: Yes
Doc Update: No

Change-Id: I7985538dde6951dd824c36149bf9a1e3ca23c734
diff --git a/ap/app/Script/scripts/psext_up_ipv6.sh b/ap/app/Script/scripts/psext_up_ipv6.sh
index 5861350..bea9640 100755
--- a/ap/app/Script/scripts/psext_up_ipv6.sh
+++ b/ap/app/Script/scripts/psext_up_ipv6.sh
@@ -120,8 +120,11 @@
 	fi
 }
 
-mtu=`nv get mtu`
-ifconfig $ps_if mtu $mtu
+ra_mtu_enable=`nv get ra_mtu_enable`
+if [ "$ra_mtu_enable" != "1" ]; then
+	mtu=`nv get mtu`
+	ifconfig $ps_if mtu $mtu
+fi
 linkup_get_addr
 linkup_route_set
 linkup_dhcpv6_set