=== modified file 'conf/busybox.config'
--- conf/busybox.config	2013-11-25 20:17:08 +0000
+++ conf/busybox.config	2014-07-18 19:01:00 +0000
@@ -854,7 +854,7 @@
 CONFIG_FEATURE_UDHCP_8021Q=y
 CONFIG_UDHCPC_DEFAULT_SCRIPT="/usr/share/udhcpc/default.script"
 CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS=80
-CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -n --timeout=60 -O staticroutes"
+CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -n --timeout=60 -O mtu -O staticroutes"
 # CONFIG_UDPSVD is not set
 CONFIG_VCONFIG=y
 CONFIG_WGET=y

=== modified file 'src/usr/share/udhcpc/default.script'
--- src/usr/share/udhcpc/default.script	2013-11-26 01:40:36 +0000
+++ src/usr/share/udhcpc/default.script	2014-07-19 18:14:57 +0000
@@ -9,6 +9,7 @@
 RESOLV_CONF="/etc/resolv.conf"
 [ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
 [ -n "$subnet" ] && NETMASK="netmask $subnet"
+[ -n "$mtu" ] && MTU="mtu $mtu" || MTU="mtu 1500"
 
 apply_static_routes() {
 	# routes are pairs of network and gateway
@@ -37,7 +38,7 @@
 		;;
 
 	renew|bound)
-		/sbin/ifconfig $interface $ip $BROADCAST $NETMASK
+		/sbin/ifconfig $interface $ip $BROADCAST $NETMASK $MTU
 
 		if [ -n "$router" ] ; then
 			echo "deleting routers"